fdm series insert - gdi communications controller user guide fdm series all fiber ... the fdm2070-6d...

(TI) 25th June 2007 Dwg. A01230

GDI COMMUNICATIONS LLC PO Box 1330 280 I-80 Exit 1

Verdi, NV 89439

Phone: (775) 345-8000 Fax: (775) 345-8010

Email: [email protected]

FDM2070-6D Fiber Optic Transceiver

for the 2070 Controller

USER GUIDE

FDM Series All Fiber Topologies - Compliant

25th June 2007 FDM2070-6D User Guide 1 Dwg: A01230

FDM2070-6D --- Table of Contents--- Page 1/2

FDM Series Overview 3

The FDM Series 3

FDM2SA 4

FDM170 4

FDM2070-6D 5

FDM FiberHub 5

FDM-FSK 5

FDM-SSR 5

Introduction to the FDM2070-6D 7

Basic Signal Flow Diagram 7

Sequence of Events 7

Modem Ergonomics 7

Front Panel Displays 8

Data Port Activity Displays 8

TXD LED’s 8

RXD LED’s 8

Data Port Anti- Streaming Alarm LED 8

Reset Switch 8

Data Ports 9

Intuitive Fiber Status Displays 9

Optical Ports 9

Bottom View 10

Side View 10

Understanding the DIP Switch Functions 11

Configuring the FDM2070-6D Modem 11

FDM DIP Switches 11

Master/Slave 11

Auxiliary Master Selection 11

Topology Selections 11

2 Rings 11

1 Ring 11

Daisy Chain 11

Data Protocol 12

RS232/485 12

Baud Rates 12

Parity 12


FDM2070-6D -- Table of Contents--- Page 2/2

RTS/CTS Handshaking 12

CTS Delay 12

Anti-Streaming 13

Auxiliary Port DCE/DTE Options 13

1. Normal Operation at a Controller Location 13

2. DTE Operation at a Controller Location 14

Dynamic DCD and KOD Operation 15

DCD Static Operation 15

RS485 Buss, Signal Polarity Change 15

Fiber Topology Applications 17

1. Single String Daisy Chain (End Master) 17

2. Daisy Chain with a Center Master 18

Notes on Displays 19

Normal Fiber Identification (No Flashing Displays) 19

Fiber Alarm Notification (ALL Displays Flashing) 19

Single Fiber Break 19

3. Self Healing Dual Counter Rotating Ring Operation 20

Fold-back Condition 21

4. Single Ring Operation 22

Single Ring Display 23

5. Point to Point Operation 24

a) Point to Point with No Redundant Fiber Path 24

b) Point to Point With Redundant Fiber Path 25

Status Display 26

Installation Guide 27

How to Install a Daisy Chain:

a) All Fiber have been correctly identified 27

b) Installing on Unmarked Fibers using Fiber Identification 29

Installing a “Branch Fiber Modem” using Fiber Identification 32

Factory Default Settings 34

Optical Dynamic Range 35

Care and Handling Procedures for Optical Connectors 36


FDM SERIES OVERVIEW

The FDM Series of Hardened Modems are designed for polling applications utilizing

RS232/485Asynchronous transmission over Multimode and Singlemode Fiber

Optics. All modems in the series are communications compatible with each other,

thus allowing greater flexibility of use.

The FDM Series comprise of six Digital Modems:

1. The FDM2SA is a Stand Alone version.

2. The FDM170 is a Plug-in version for the 170 Controller

3. The FDM2070-6D is a Plug-in version for the 2070 Controller

4. The FDM FiberHub performs as a 1 x 3 star optical hub that ties in

optical branch circuits into the mainstream communications path.

5. The FDM-FSK is a combination of a FDM2SA and a FSK modem.

6. The FDM-SSR is a combination of a FDM2SA and a Spread Spectrum

Radio.

The modems can operate in many different topologies, even on a simple fiber ring

when there is only one fiber available, later as more fibers become available,

simply flip a switch to change to the new topology.

This unique capability of operating in multiple topologies offers the advantage of

One Modem for all Topologies.

Switch Selectable Topologies are as follows:

• Single Fiber Ring

• Dual Fiber Redundant Ring (Self Healing)

• Point to Point

• Daisy Chain Format.

The modems have a high dynamic range yet they are immune to optical over

loads, therefore no optical attenuators are required for short runs or even bench

top “back to back” testing!

Any modem can be designated as a Master or Slave, also for Auto Restoration

any modem can be designated as an Auxiliary Master.


FDM SERIES OVERVIEW continued

A unique and intuitive Dual Seven Segment display graphically indicates the

status of the fiber system, making diagnostics visually simple. All FDM series modems have the unique capability of Fiber Identification; the display will flash a

1 or 2 indicating which circuit the fiber belongs to.

Other advantages include multiple use Dual Data Ports enabling branch circuit

capabilities such as an On Street Master to Local Controller (same location), or

4wire or Spread Spectrum Radio communications.

All modems have the unique capability of having their Auxiliary Port switched

from DCE to DTE mode. This feature allows the Main port to drive the Aux-Port

as well as the fiber, primarily used for Street Master communications with the

local controller or driving some other modem.

Only FDM optical modems have the unique ability to generate a Carrier Detect

both before and after data flow, this is essential when connecting to 2 Wire FSK

communications. This Dynamic CD acts like a “DTE’s RTS” and is used to

initiate handshaking to a DCE’s RTS input.

The FDM Series represents a new generation of digital fiber optic modems

utilizing a Replaceable Operating System (ROS). As requirements change, or new

features become available, a new program can be loaded so as to provide a

migration path to upgrade the existing system.

FDM2SA

This is the “Stand Alone” version and has two Data Ports, one designated as the

Main Port, the other being an Auxiliary Port. The Main Data Port is used for

connection to a controller. The Auxiliary Data Port can be used for many

associated functions such as connecting to a Backup Server or for Over the Air

Restoration, or combining external data links into the polling stream.

A unique built-in Key on Data capability allows the fiber modem to act as DTE

and provide all necessary handshaking. This unique feature allows a Remote Fiber

System (Tail Circuit) to be integrated into a 4wire FSK circuit and on to city hall.

FDM170


This is a Plug-In version for the 170 Series of Controllers and the R400/R800

Rack Series. The Main Data port is connected via the card edge connector to the

170 backplane while the Aux Data Port RJ45 is front accessible for combining

external data links in the polling stream.

For rack-mounted communications at the Traffic Maintenance Center, R400/R800

Series Racks can be populated with the FDM170 to complete the communications

system.

FDM2070-6D

This is a Plug-In version for the 2070 Series of Controllers. The Main and

Auxiliary Data ports provide the same functionality as in the FDM170, plus one

of the 2070’s spare Serial Ports SP2 or SP4 (slot dependant) is also brought out to

the front panel. For rack-mounted communications at the Traffic Maintenance

Center, R400/R800 Series Racks would be populated with the FDM170 to

complete the communications system.

FDM FiberHub

The FiberHub is designed to act like a hub or star that ties

four optical branch circuits together in a 1 x 3

A typically deployment would be anywhere in a fiber

arterial daisy-chain or ring at an intersection where it ties

in the “North/South” cross street optical branch circuits

into the “West/East” main arterial fiber run. As with all

FDM modems , data ports are provided for the local

controller and auxiliary communications.

FDM-FSK

The FDM-FSK is a combination of the FDM2SA

Fiber Optic Modem and GDI’s Model 4xx Series

FSK Modem, basically it is two interconnected

modems housed in the same enclosure. Two RS232

Data Ports are provided along with the 2/4 Wire

FSK Port, all three ports communicate to and from

the fiber to the originating “master source”.

FDM-SSR

The FDM-SSR is a combination of the FDM2SA Fiber Optic Modem and

SSR900FH Spread Spectrum Modem, basically it is two interconnected modems

N

W E

S

Fiber Trunk

Main

Port

Aux-Port

T1

R2T2

R1

2/4WirePort

Fiber Trunk

RS232 RS232 2/4 Wire

FSKModem

FDM2SAFiber Optic

Modem

FDM-FSK Modem


housed in the same enclosure. Can be used for tying in orphaned intersections into

the fiber system or fiber to radio to fiber bridges and last mile applications.

FDM2070-6D

This User Guide describes the FDM2070-6D and its operation


INTRODUCTION to the FDM2070-6D

Basic Signal Flow Diagram

Sequence of Events

• The Polling Data enters the Master’s Main or Auxiliary Port and is then broadcast

to the remote modems over the fiber optic transport layer.

• At each Remote FDM the Polling Data is passed to the Main and Auxiliary Data

Ports.

• Response Data entering the Remotes Main, Auxiliary is transmitted back to the

Master Modem.

• At the Master Modem, Response Data from the Remotes is passed to the Masters

Main and Auxiliary Ports and back to the Servers.

• RS232 access to the controller’s SP2 or SP4 (RS485) is also provided.

Modem Ergonomics

The Front Panel displays show information on the status of the FDM2070-6D,

also where the RS232 data and fiber interconnections are made.

All the switch-able options are located on the Bottom Panel to minimize ingress

of foreign material in roadside cabinet applications.

The Back panel is where the FDM2070-6D plugs into the controller.

On the Front Panel, there are two dual bulkhead Fiber Ports

which can be easily changed between ST, FC and SC style

connectors. The bulkheads are optically linked to the fiber

optic transceivers through short patchcords located inside

the protective enclosure.

Fiber Optic

Transceiver

Bulkhead

“Mini” Patchcords


These inexpensive “mini” patchcords isolate the transceivers from the “outside

world” and provide them with 100% protection from being damage by external

dirty patchcords. Replacing the mini patchcords can be easily done by the

customer.

Front Panel Displays

The FDM2070-6D front panel is divided into three groups:

• The upper is for viewing Data Port Activity and

connection of a data equipment.

• The middle Section is for Fiber Status and Fiber

Identification.

• The lower section is the Fiber Optic Interface.

Data Ports and Activity Displays

This section displays the activity of data through the modem.

TXD LED’s This indicates data activity from the fiber to the data port.

RXD LED’s This indicates data activity from the data port to the fiber.

Data Port Anti-Streaming Alarm LED This indicates port data exceeded selected time out.

Reset Switch Switch for resetting Anti-Streaming Alarm.

MAIN DATA ALARM

RESET

ANTI-

STREAM

AUX DATA

TXD RXD

TXD RXD

R1

R2T2

T1

LOS

LOS

PWR

Fiber Satus

MAIN DATA ALARM

RESET

ANTI-

STREAM

AUX DATA

SERIAL

PORT

TXD RXD

TXD RXD

TXD RXD

FDM

2070-6D

GDINEVADA

Fail

R2

T1

T2

R1

MODEM


Data Ports

The fiber optic modem has Dual RS232 Data Ports

(Main and Auxiliary), this is a single channel with

dual ports, The Main Data Port’s edge connector

plugs directly into the local controller’s buss, while

the Auxiliary RJ45 connector on the front panel can

be used to bring in auxiliary or radio based

communications into the main data stream.

The Serial Port converts RS232 signals at the front panels RJ45 to

RS485 on the edge connector for SP2 or SP4 communications.

Intuitive Fiber Status Displays

The seven segment displays show information as to the integrity of

the fiber system, each of the red segment lines represent the

incoming or outgoing fiber data path through the modem, while

LOS indicates a loss of incoming optical signal. This display is also

used for Fiber Identification to which determines which port the

fiber connects to.

See section Fiber Topology Applications on page 17

Optical Ports

The optical ports are dual hybrid adapters that are interchangeable

should a different style of connector such as ST, FC and SC be

required.

These hybrid adapters are coupled to the main optical transceivers

through replaceable mini patchcords that isolate and protect the main optics from

possible damage do to external dirty or damaged patchcords.

R1

R2T2

T1

LOS

LOS

PWR Fail

R2

T1

T2

R1

SERIAL

PORT

TXD RXD

Main

Data

Port

Aux Port

Serial Port


Bottom View

The modem has an internal UPS system that if equipped with an

optional battery it will power the modem should power fail. The

modem will be fully operational until the batteries are depleted.

Resumption of power will start the battery charging process while

at the same time the modem will be fully operational.

The Battery On Off switch connects or disconnects the battery to

the modem. For shipping and storage purposes leave the switch in

the OFF position.

The DIP Switches on this panel defines how the modem will

operate such as will it be a Master or Slave or what Fiber

Topology do you want it operate over, as well as defining the

Data Parameters and do we need handshaking, anti-streaming

etc?

A full list of options and switch settings are described in the

section Understanding the DIP Switch Functions on page 11.

Side View

Pin out connection diagrams are included on this panel to assist the technician

when making interconnect cables.

MASTER

AUX-MASTER

2 RINGS

DAISY CHAIN

RS232

1200

2400

9600

19.2KBT/S

38.4KBT/S

57.6KBT/S

115.2KBT/S

PARITY

ODD

RTS-CTS

CTS-0ms

ANTI-STRM

2

4

8

16

32

64

AUX PORT DCE

(Normal)

SLAVE

OFF

1 RING

RING

RS485

OFF

OFF

NONE

EVEN

OFF

8ms

OFF

OFF

DIN

OFF ON

BATTERY

DTE

DYNAMIC DCD ON

DCD Set LOW HI

KOD OFF ON

Dynamic DCD Function

Set 1 & 3 to ON

RS-485 (+) (-)

Changes Signal Polarity

at 2070 Buss Interface

AuxPort

Serial Port

1 8

1 + 5VDC

2 DCD

3 N/C

4 GND

5 RXD

6 TXD

7 CTS

8 RTS

1 N/C

2 DCD/KOD

3 N/C

4 GND

5 RXD

6 TXD

7 CTS

8 RTS

GDI Communications LLCVERDI NEVADA 89439

775 345 8000

Fiber Digital Modem Series

FDM 2070-6D

AuxPort

Serial Port

1 8

1 + 5VDC2 DCD3 N/C

4 GND

5 RXD6 TXD7 CTS

8 RTS

1 N/C

2 DCD/KOD3 N/C4 GND

5 RXD

6 TXD7 CTS8 RTS


Understanding the DIP Switches Functions

Configuring the FDM2070-6D Modem

You must configure the modem to your system requirements by using the DIP

Switches located on the bottom of the modem before you insert it into the 2070

Controller.

The following text explains the purpose of the function and where the switch is

located.

FDM DIP Switches

Master/Slave.

The modem at the “Head End” or “TMC” that connects into the

fiber system defines that it will be set as a Master, all other

modems shall be set as slaves.

Auxiliary Master Selection This switch selection is used for Alternate TMC Disaster Recovery scenarios,

otherwise set it to the OFF position. Typically a city works

yard would have an Emergency TMC, it is here that the local

modem would be set as an Auxiliary Master. Should a

catastrophe occur at the Primary Master Location, the

Auxiliary Master will automatically take over the operation of

the fiber system, then automatically hand back control when

the Primary TMC is back on line.

Topology Selections

Please note that you can have any combination of the following

topologies,

just mix or match, see section Fiber Topology Applications on

page 17 for examples.

1. 2 Rings (Self Healing Dual Counter Rotating Rings) This selection provides the best fault tolerant protection.

2. 1 Ring This selection is used when there is only one spare fiber

left to form a Single Ring

3. Daisy Chain This selection is for the classic Daisy Chain, leave the

previous switch set to 2 Rings and set the Master and

the last Slave to Daisy Chain.

1 RingRing

2 RingsDaisy Chain

SlaveMaster

OffAux. Master


Data Protocol

RS232/485

Auxiliary Port’s Line Drivers Protocol can be switched to match

external requirements.

Although the Main Port (Card Edge) is fixed at RS485 to match

the controller’s Buss, the signal polarity may be switched.

See RS485 Buss, Signal Polarity Change

Baud Rates

The selectable Baud Rates are, 1200, 2400, 9600, 19.2Kbt/s,

38.4Kbt/s, 57.6Kbt/s and 115.2Kbt/s.

Parity

Parity can be set for None, Odd or Even.

Switch settings shown are Parity enabled and Even selected.

For no Parity select None.

RTS/CTS Handshaking

When Handshaking is turned Off, data arriving at either data

port from the attached devices will be transmitted over the fiber.

When Handshaking is turned On and RTS is high or raised,

data arriving at either data port from the attached devices will

be transmitted over the fiber. When RTS is low no data will

flow

CTS Delay

The RTS to CTS delay can be set at 0ms or 8ms, 0ms is for fast

operation and 8 ms is used for external transmission systems

that require a delay.

OffOffOffOffOffOffOff

24009600

38.4Kbts57.6Kbts

1200

19.2Kbts

115.2Kbts

Parity NoneOdd Even

RTS-CTS Off

CTS-0ms 8ms

RS485RS232


Anti- Streaming

Anti-Streaming times 2, 4, 8, 16, 32, and 64 seconds, all are

switch selectable and are additive to a maximum of 126

seconds.

When RTS is raised the anti-streaming countdown timer starts,

at its conclusion the data to fiber path is inhibited and latched in

an open state, CTS is then lowered and the anti-streaming Alarm LED is lit.

Should RTS be lowered the system will automatically reset but the anti-streaming

alarm will remain lit indicating data timing violations from the

attached controller.

If the front panel anti- streaming RESET switch is momentary

pushed, the alarm LED will extinguish.

Auxiliary Port DCE/DTE Options

This selection is normally left in the DCE mode, see diagram below, but if

required the Auxiliary port can be driven from the Main port and appear as a

DTE, see 2 on next page..

Data Port Flow Diagrams

1. Normal Operation at a Controller Location.

(Aux Port switched to Normal Mode DCE)

When switched to DCE Mode the bi-directional signal flow originates from

the fiber to the Main and Auxiliary Ports, as the Main Port is connected to

Local Controller, the Aux Port can be connected to other modems such as a

4Wire FSK (DCE) or SS Radio (DCE). If handshaking is required see

Dynamic DCD and KOD Operation on page 15.

Ant-Strm Off248

1832

C-Mast 64 Off

DTEAux.Port DCE

MAIN DATA ALARM

RESET

ANTI-

STREAM

AUX DATA

TXD RXD

TXD RXD

Line

DriversFiber Optics Data Flow

Main Port

TXD

RXD

RTS

CTS

Aux Port (RJ45)

Co

mm

on

F

un

cti

on

Local

Controller2070(DTE)

S.S.Radio(DCE)

4Wire FSK

(DCE)

Card Edge Connector

Cable

FDM2070

Data Ports

6 TXD

5 RXD

8 RTS

7 CTS


2. DTE Operation at a Controller Location.

(Aux Port switched to DTE Mode)

This feature allows the Main Port’s attached DTE device (On Street Master)

to drive the fiber and appear as a DTE at the Auxiliary Port.

The Auxiliary Port now looks like the On Street Master’s DTE port complete

with RTS/CTS Handshaking, this provides the necessary flow control for

driving 2wire FSK Modems.

DTEAux.Port DCE

Line

DriversFiber Optics Data Flow

Main Port

TXD

RXD

RTS

CTS

Aux Port (RJ45)

Local

Controller

2070

(DTE)

S.S.Radio

(DCE)

2/4Wire

FSK

(DCE)

Card Edge

Connector

Cable

FDM2070

Data Ports

6 TXD

5 RXD

8 RTS

7 CTS


Dynamic DCD and KOD Operation

Some Controller Operating Systems require the Data Carrier

Detect (DCD) signal to indicate whether or not there is

incoming data. This is a dynamic signaling process of

asserting and de-asserting DCD as to whether or not data is

present. The FDM 2070-6D Fiber Optic Modem has special

circuitry that mimics this signaling process thus allowing

fiber communications instead of copper. Handshaking

originates from the fiber to the both the controller and

Auxiliary Port.

To activate this process, turn Dynamic DCD and KOD ON.

DCD Static Operation

If the Controller Operating System requires a Static DCD

signal then turn off Dynamic DCD and select either DCD

Set Low (De-asserted) or HI (Asserted) as required by the

Operating System.

RS485 Buss, Signal Polarity Change

Not all 2070 Controller Manufacturers have the same signal

polarity at the Buss Interface. To accommodate both

manufacturing camps we have included a switch-able

feature that selects either + or - signal polarity at the 2070

Buss Interface

DYNAMIC DCD ONDCD Set LOW HI

RS-485 (+) (-)

Changes Signal Polarityat 2070 Buss Interface

DYNAMIC DCD ON

KOD OFF ON

Dynamic DCD FunctionSet 1 & 3 to ON

Line Drivers

Fiber Optics Data Flow

TXD

RXD

6 TXD

5 RXD

RTS

CTS

Aux Port (RJ45)

8 RTS

7 CTSCo

mm

on

F

un

cti

on

Local Controller

2070(DTE)

2Wire FSK(DCE)

Card Edge Connector

Cable

FDM2070

Data Ports

2 DCD

Dynamic DCD

Dynamic DCD

DCD

RTS

2 Wire


This page is left intentionally blank


Fiber Topology Applications

1. Single String Daisy Chain (End Master)

This configuration is used when there is no fiber ring available, only one pair of

fibers available from controller to controller, a typical application would be a

TMC or Street Master feeding an arterial string and terminating at the far end.

Normal Display (No Flashing Displays)

Modem DIP Switch Settings for 9600 8N1 The Dip Switch settings listed below show what would be required to set the

modems to operate at 9600baud 8N1, this is a typical setting for the traffic

industry, all other switch positions not shown are in the Off position or “other

selection”.

Anti-Streaming is “always off” at a Master, end modems are set to Daisy Chain.

Modem Dip Switch Settings Master Modem Middle Slaves End Slave

Master Slave Slave Slave

2 Ring 2 Ring 2 Ring 2 Ring

Daisy Chain * Ring Ring Daisy Chain *

RS232 RS232 RS232 RS232

9600 9600 9600 9600

None None None None

RTS/CTS RTS/CTS RTS/CTS RTS/CTS

CTS-0ms CTS-0ms CTS-0ms CTS-0ms

Off Anti-Stream Anti-Stream Anti-Stream

N.A. 2 Seconds 2 Seconds 2 Seconds

Aux Port Normal Aux Port Normal Aux Port Normal Aux Port Normal

T1

FDM

Master

R2

TMC

Computer

DATA R1

FDM

Slave 1

RTU /

Controller

T1

R2 T2

RTU /

Controller

FDM

Slave 2

FDM

Slave 3

RTU /

Controller

T1 R1 R1

R2 T2 T2

T1

R2

R1

T2

LOS

LOS

Middle Slave (s)

T1

R2

R1

T2

LOS

LOS

T1

R2

R1

T2

LOS

LOS

End Slave

T1

R2

R1

T2

LOS

LOS

FDM

MasterMiddle Slave (s)


T1 R1 End Slave

RTU /

Controller

Master Middle

Slave(s) End Slave

RTU /

Controller

RTU /

Controller

T1 T1 R1 R1

R2 R2 R2 T2 T2 T2

TMC

Computer

DATA

2. Daisy Chain with a Center Master

The “Center” Master Modem can be located anywhere in the Daisy Chain. In

some scenario’s, the TMC may not be at the beginning, but somewhere in the

“middle” of the arterial daisy chain. The above layout shows how to connect

modems to both sides of the master.

Normal Display ( No Flashing Displays)

Note at the Master Modem you need to switch it to “Center Master” by selecting

C-Mast 64 as well as Daisy Chain., note all end modems have Daisy Chain

selected.

Anti- Streaming is not used at a Master location.

Modem Dip Switch Settings End Slave Master Modem Middle Slaves End Slave Modem

Slave Master Slave Slave

2 Ring 2 Ring 2 Ring 2 Ring

Daisy Chain * Daisy Chain * Ring Daisy Chain *

RS232 RS232 RS232 RS232

9600 9600 9600 9600

None None None None

RTS/CTS RTS/CTS RTS/CTS RTS/CTS

CTS-0ms CTS-0ms CTS-0ms CTS-0ms

Anti-Stream Off Anti-Stream Anti-Stream

2 Seconds C-Mast 64 * 2 Seconds 2 Seconds

Aux Port Normal Aux Port Normal Aux Port Normal Aux Port Normal

T1

R2

R1

T2

LOS

LOS

Middle Slave (s)

T1

R2

R1

T2

LOS

LOS

T1

R2

R1

T2

LOS

LOS

End Slave

T1

R2

R1

T2

LOS

LOS

FDM

MasterEnd Slave


Notes on Displays

Normal Fiber Indication (No Flashing Displays)

With all the modems installed and communicating at the fiber level no flashing of

the fiber displays will take place, this is because we have end to end continuity

and have terminated the first and last modem. If we have a break or loss of fiber

signal on any input or leave the line unterminated, which is the same as a LOS, all

fiber modems will flash to alert the technician of an abnormal condition.

Fiber Alarm Notification (All Displays Flashing)

Here we show a cable cut somewhere in the mid span Slaves, this results in

isolating the downstream modems from the polling Master.

Note the LOS alarms on the modems adjacent to the cut, this indicates that the

break is between the two modems; also note the “fold-back symbol” indicates the

modem has communications to its adjacent modems but not across the break. The

down-stream isolated modems are in communications with each other and will

automatically come back on line when the break is repaired.

Single Fiber Break

Here we have a single fiber break between T1 on one modem to R1 on the next

modem, this is indicated by a flashing LOS at R1, in this case the problem is

likely a broken patchcord at either end of the fiber. The other fiber modem shows

no LOS as it is receiving a good signal,

T1

R2

R1

T2

LOS

LOS

Middle Slave (s)

T1

R2

R1

T2

LOS

LOS

T1

R2

R1

T2

LOS

LOS

End Slave

T1

R2

R1

T2

LOS

LOS

FDM


T1

R2

R1

T2

LOS

LOS

Middle Slave (s)

T1

R2

R1

T2

LOS

LOS

T1

R2

R1

T2

LOS

LOS

End Slave

T1

R2

R1

T2

LOS

LOS

FDM


Indicates “Fiber Communications” aregood on this segment.

Fold-Back indicationIndicates “Fiber Communications” are

good on this segment.

T1

R2

R1

T2

LOS

LOS

Middle Slave (s)

T1

R2

R1

T2

LOS

LOS

T1

R2

R1

T2

LOS

LOS

End Slave

T1

R2

R1

T2

LOS

LOS

FDM


No LOS


3. Self Healing Dual Counter Rotating Ring Operation

This format requires that two fibers to be connected from modem to modem until

a dual counter-rotating ring is formed. The advantage of this format is that if there

is a fiber cut between any modems or a modem failure, the adjacent modems

straddling the malfunction will automatically fold back into Ring 2 causing the

system to self heal by forming a new ring. See Foldback illustration on the next

page.




selection”.

Master Modem Slave Modem

Master Slave

2 Rings 2 Rings

RS232 RS232

9600 9600

None (Parity) None (Parity)

RTS/CTS RTS/CTS

CTS-0ms CTS-0ms

Off Anti-Stream

2 Seconds

Aux Port Normal Aux Port Modem

R1

T1

T1

T1

T1

R1

R1

R1

FDM

Slave 1

FDM

Slave 2

FDM

Slave 3

TMC

Computer

RTU /

Controller

Dual Counter Rotating Ring

Format

RTU /

Controller

RTU /

Controller

FDM

Master

R2

R2

R2 T2

T2

T2

T2

R2

RING 1

RING 2


Foldback Condition

Under normal conditions all the modems would have a static

display showing a two-ring operation.

With a failure of any Slave or a cable cut, the adjacent modems would fold back

to form a new ring, thus maintaining communications. Next a message is sent to

all the other modems in the system to flash their displays once a second to

indicate a ring fold-back has taken place. The above diagram shows a catastrophic

event at Slave 2, with the resulting graphics displays below.

T1

R2

R1

T2

LOS

LOS

Normal

Fiber Status

T1

R2

R1

T2

LOS

LOS

Slave 3

T1

R2

R1

T2

LOS

LOS

T1

R2

R1

T2

LOS

FDMMaster

Slave 1

Fold-Back indication Indicates “Fiber Communications”

are good in this segment.Fold-Back indication

R1

T1

T1

T1

T1

R1

R1

R1

FDM Slave 1

FDM Slave 3

DATA

See Ring Status Displays Below

R 2

R2

R2

T2

T2

T2

T2

R2

RING 1

RING 2 RTU /

Controller RTU /

Controller

TMC Computer

FDM Master

FDM Slave 2

RTU /Controller

R1 T1


R1

T1

T1

T1

T1

R1

R1

R1

FDM

Slave 1

FDM

Slave 2

FDM

Slave 3

TMC

Computer

DATA

RTU /

Controller

Single Fiber

Loop

RTU /

Controller

RTU /

Controller

FDM

Master

4. Single Ring Operation

This configuration is useful when there is only one fiber available from modem to

modem, it has the lowest security of all configurable systems, should the ring be

broken then the system will collapse.




selection”.


Master Slave

1 Ring 1 Ring

RS232 RS232

9600 9600

None None

RTS/CTS RTS/CTS

CTS-0ms CTS-0ms

Off Anti-Stream

2 Seconds

Aux Port Normal Aux Port Normal


Single Ring Display

In the Single Ring mode, all the displays will be static until

there is a break in the ring, when this condition occurs all

displays will flash, the modem that has lost it’s input will

flash a Loss Of Signal alarm (LOS)

The following displays indicate a progressive build out of a Single Ring.

T1R1

LOS

T1R1

LOS

T1R1

LOS

T1R1

LOS

T1R1

LOS

T1R1

LOS

T1R1

LOS

T1R1

LOS

T1R1

LOS

Master

Master

Master

Master

Slave 1

Slave 1 Slave 2

Slave 1 Slave 2

T1R1

LOS

Slave 1


5. Point to Point Operation

a) Point to Point with No Redundant Fiber Path

In this situation we only have two fibers available, so we create a single ring, all

operations and indications will be the same as the previous single ring setup.




selection”.


Master Slave

1 Ring 1 Ring

RS232 RS232

9600 9600

None None

RTS/CTS RTS/CTS

CTS-0ms CTS-0ms

Off Anti-Stream

2 Seconds


FDM

Master

Modem

FDM

Slave

Modem

Host

Computer

TMC

RTU /

Controller

T1

T2 R2

R1 T1 R1

T2 R2

Data Data

Fiber Path


b) Point to Point with Redundant Fiber Path

The above shows a single Point to Point System with fail safe redundant fiber

optics, if the primary path fails then the system will automatically run on the

secondary (redundant) path. The best system security is obtained by running two

separate cables following different paths, one cable has T1/R2 fibers and the other

has R1/T2, if one cable is completely severed the system will automatically

recover via the other cable.




selection”.


Master Slave

2 Ring 2 Ring

RS232 RS232

9600 9600

None None

RTS/CTS RTS/CTS

CTS-0ms CTS-0ms

Off Anti-Stream

2 Seconds


FDM

Master

Modem

FDM

Slave

Modem

Host

Computer

TMC

RTU /

Controller

T1

R2 T2

R1 T2 R2

R1 T1

Cable 2

Data Data

Cable 1

Fiber

T1

R2

R1

T2

LOS

LOS

Fiber Status

Normal

T1

R2

R1

T2

LOS

LOS

Fiber Status

Normal


Status Display

A failure of any receive fiber would cause the following fold-back

indication to be displayed.

T2

T1

R2

R1

T2

T1

R2

R1

T2

T1

R2

R1

T2

T1

R2

R1

T2

T1

R2

R1

T2

T1

R2

R1

T2

T1

R2

R1

T2

T1

R2

R1

LOS

LOS

LOS

LOS

T1

R2

R1

T2

LOS

LOS

Fiber Status

Normal

T1

R2

R1

T2

LOS

LOS

Fiber Status

Normal


Installation Guide

How to Install a Daisy Chain

a) All Fibers have been Correctly Identified

Let’s assume that we are installing a Daisy Chain down an arterial roadway, the

first modem would be set as a Master and all other modems set as Slaves. At each

end of the system you will have only two fibers, and at all locations in between

there will be four fibers, two from downstream and two from upstream, all fibers

have marked patchcords installed identifying which fiber/cable it is attached to.

Using the preceding chart as a guide, all the modems have been set up with the

correct working parameters; the first and last modem is set to Daisy Chain.

Master Location

Starting at the Master location, plug in the modem that has been set up as Master

and connect the patchcords into T1 and R2. Note that only R2 shows a LOS

alarm, this is because you have set the first modem to Daisy Chain, this terminates

the unused side and therefore no alarms or displays will appear for this side. At

this point we are transmitting on T1 and receiving nothing on R2, the next step is

at Slave 1 location.

Slave 1 Location

Step 1

At the Slave 1 location, plug in the Slave Modem, you will notice that both LOS

lights will be flashing due to no signal inputs.

R1

R2T2

T1LOS

LOS

Master

Fiber Optic

Cable

R1

R2T2

T1LOS

LOS

Master

Fiber Optic

Cable

R1

R2T2

T1LOS

LOS

Slave 1

T1

R2

R1

T2

LOS

LOS

Middle Slave (s)

T1

R2

R1

T2

LOS

LOS

T1

R2

R1

T2

LOS

LOS

End Slave

T1

R2

R1

T2

LOS

LOS

FDM



Step 2

Connect the patchcord R1, note that the LOS alarm turns off due to the modem

detecting the signal from the upstream Master.

Step 3

Connect the patchcord T2, note the fold-back sign appears, this indicates that

Slave 1 modem has synchronized with the proceeding modem (Master) and

created a return path thus providing optical communications. The display will

flash.

At the Master the display will have changed to indicate as it has synched up

with the Slave modem, whilst the other side is blank indicating it is not in use

(terminated). The displays will flash. At this juncture if the Master was polling

Slave 1, bi-directional data communications should now take place and the data

lights will flash accordingly.

As we have not installed Slave 2 we still have a valid LOS alarm on R2.

Install the two remaining patchcords T1 and R2.

Slave 2 Location

Repeat steps 1 through 3 at this and all mid slave locations; note how the

preceding Slave modem’s display shows that it has synched up with modems on

either side indicating upstream and downstream fiber circuits are connected

through. The displays will flash.

R1

R2T2

T1LOS

LOS

Master

R1

R2T2

T1LOS

LOS

Slave 1

R1

R2T2

T1LOS

LOS

Master

R1

R2T2

T1LOS

LOS

Slave 1

R1

R2T2

T1LOS

LOS

Slave 1

R1

R2T2

T1LOS

LOS

Slave 2

R1

R2T2

T1LOS

LOS

Master


End Slave

As with the first modem (Master), the last modem (Slave) is also “terminating”

the lines so we set it to Daisy Chain. The display will show a flashing LOS for R1

but blank for R2 as this is the terminated side. When the R1 patchcord is

connected and the signal is received the LOS will extinguish, next we connect T2

patchcord and the modem will synch up with the preceding modem.

The display will now indicate and no longer flash; the installation is now

complete.

b) Installing on Unmarked Fibers using Fiber Identification

In situations where the fibers are not identified, the modem has the unique ability

of identifying whether a fiber has Receiver 1 or Receiver 2 traffic by flashing the

message 1 or 2 to denote which receiver that fiber belongs to.

Using this feature allows us to quickly and correctly route all the fibers.

Let’s assume that we are installing a Daisy Chain down an arterial roadway, the

first modem would be set as a Master and all other modems set as Slaves.

At each end of the system you will have only two fibers, and at all locations in

between there will be four fibers, two from downstream and two from upstream.

Using the preceding chart as a guide, all the modems have been set up with the

correct working parameters; the first and last modem is set to Daisy Chain.

R1

R2T2

T1LOS

LOS

Slave 1

R1

R2T2

T1LOS

LOS

Slave 2

R1

R2T2

T1LOS

LOS

Master

R1

R2T2

T1LOS

LOS

End Slave

T1

R2

R1

T2

A B

LOS

LOS

R2

Display indicates patchcord belongs in R2.

T1

R2

R1

T2

A B

LOS

LOS

R1

Display indicates patchcord belongs in R1.

T1

R2

R1

T2

LOS

LOS

Middle Slave (s)

T1

R2

R1

T2

LOS

LOS

T1

R2

R1

T2

LOS

LOS

End Slave

T1

R2

R1

T2

LOS

LOS

FDM



Master Location

Step 1

Starting at the Master location, plug in the modem that has been set up as Master

and then connect patchcords from T1 and R2 into the fiber optic cable. Note that

only R2 shows a LOS alarm, this is because you have set the first modem to

Daisy Chain, this terminates the unused side and therefore no alarms or displays

will appear for this side. At this point we are transmitting on T1 and receiving

nothing on R2, the next step is at Slave 1 location.

Slave 1 Location

Step 1

At the Slave 1 location, plug in the Slave Modem, you will notice that both LOS

lights will be flashing due to no signal inputs.

Step 2 Next connect one end of a patchcord into R2 and then start

cycling the other end through all four ports on the patch panel

until you see the modems display indicates “1”. This is

indicating that this fiber belongs to R1 on the Modem.

Step 3 Remove this fiber from R2 and insert into R1, the 1 disappears

along with R1 LOS.

Step 4 The remaining three patchcords are then rotated through T2

until you see R1/T2 fold-back flashing. This modem is now

synced up with the preceding upstream modems and is online

with its controller.

R1

R2T2

T1LOS

LOS

Master

Fiber Optic

Cable

R1

R2T2

T1LOS

LOS

Master

Fiber Optic

Cable

R1

R2T2

T1LOS

LOS

Slave 1

R1

R2T2

T1LOS

LOS

R1

R2T2

T1LOS

LOS

R1

R2T2

T1LOS

LOS


Step 6

At the Master the display will have changed to indicate as it has synched up with

the Slave modem, whilst the other side is blank indicating it is not in use

(terminated). The displays will flash. At this juncture if the Master was polling

Slave 1, bi-directional data communications should now take place and the data

lights will flash accordingly.

As we have not installed Slave 2 we still have a valid LOS alarm on R2.

Install the two remaining patchcords from T1 and R into the downstream fiber

optic cable.

At all other slave locations, except the End Slave, repeat Slave 1 setup.

End Slave Location

As with the first modem (Master), the last modem (Slave) is also “terminating”

the lines so we set it to Daisy Chain. The display will show a flashing LOS for R1

but blank for R2 as this is the terminated side.

Connect a patchcord to R1 and cycle through the two fiber ports on the patch

panel until R1 LOS extinguishes. Connect another patchcord between T2 and the

remaining fiber port and the modem will now synch up with the preceding

modem.

The display will now indicate and no longer flash; the installation is now

complete.

R1

R2T2

T1LOS

LOS

Master

R1

R2T2

T1LOS

LOS

Slave 1

T1

R2

R1

T2

LOS

LOS

Middle Slave (s)

T1

R2

R1

T2

LOS

LOS

T1

R2

R1

T2

LOS

LOS

End Slave

T1

R2

R1

T2

LOS

LOS

FDM



Installing a “Branch Fiber Modem” using Fiber Identification

Let’s assume we are at a new location that has been inserted into an existing working

system. In the Main Fiber Optic Cable, the two working fibers between the Existing

Slaves have been cut at the Splice Box location thus producing four fiber ends.

These fiber ends were then spliced into four fibers in the new Branch Fiber Optic

Cable. At the New Slave location these four fibers each terminate at a fiber port

inside a patch panel. The four fiber ports have not been marked to identify whether

they are from the upstream or downstream cable or whether they are transmit or

receive fibers.

The following method uses the Fiber Identification technique to quickly determine

the correct fiber patching between the patch panel and the modem. The following

example we will use Receiver 2 as our detector.

Before inserting the modem make sure that it has been set up correctly.

Step:

1. Plug the modem into the controller, note R1 and R2 LOS

LED’s are flashing due to no input.

2. Next connect one end of a patchcord into R2 and then start

cycling the other end through all four ports on the patch panel

until you see the modems display indicates “1”. This is

indicating that this fiber belongs to R1 on the Modem.

3. Remove this fiber from R2 and insert into R1, the 1 disappears

along with R1 LOS.

4. The remaining three patchcords are then rotated through T2

until you see R1/T2 fold-back flashing. This modem is now

synced up with the preceding upstream modems and is online

with its controller.

New

Slave

FDM2070

Existing

Slave

FDM2070

Existing

Slave

FDM2070

Main Fiber Optic Cable Main Fiber Optic Cable

Splice Box

Branch

Fiber Optic Cable

R1

R2T2

T1LOS

LOS

R1

R2T2

T1LOS

LOS

R1

R2T2

T1LOS

LOS

R1

R2T2

T1LOS

LOS


5. The remaining two patchcords are then cycled through R2 until

you see R2 LOS disappear.

6. The remaining patchcord is inserted into T1 and the display

now stop flashing which indicates that the modem is passing

both up and downstream fiber traffic.

R1

R2T2

T1LOS

LOS

R1

R2T2

T1LOS

LOS


Factory Default Settings

All FDM2070-6D Plug-in Modems are shipped from the factory with the

following DIP Switch settings enabled.

Data Port Pin Out Assignments

Serial Port Auxiliary Port

Pins Serial Port DCE Data Flows Auxiliary Port DCE Data Flows

1 +5V NC

2 DCD Out DCD Out

3 NC NC

4 GND GND Common

5 RXD Common RXD Out

6 TXD TXD In

7 CTS In CTS Out

8 RTS Out RTS In

Anti-Streaming times are additive,

e.g. 2 + 4 = 6 seconds

(max. time 126 sec)

SlaveOff1 RingRing

OffOffOffOffOffOffOff

Parity NoneOdd Even

RTS-CTS OffCTS-0ms 8msAnt-Strm Off

248

1832

C-Mast 64 OffDTE

Master

2 RingsDaisy Chain

RS232

24009600

38.4Kbts57.6Kbts

Aux. Master

1200

19.2Kbts

115.2Kbts

Aux.Port DCE

DYNAMIC DCD ONDCD Set LOW HI

KOD OFF ON

Dynamic DCD Function

Set 1 & 3 to ON

RS-485 (+) (-)

Changes Signal Polarity

at 2070 Buss Interface


Optical Dynamic Range

For any system to work reliably there must be adequate signal level at the

receiver. The modem must have a larger Dynamic Range, expressed in db, than

the cables end to end attenuation (db).

All Singlemode FDM series have 25DB of dynamic range.

Steps necessary to determine reliable operation,

1. Determine if your fiber is Multi-Mode or Single Mode.

2. Using an Optical Power Meter measure the End to End Attenuation of

your fiber pair, including all patchcords at the operating wavelength.

3. Add a minimum of 3db safety margin to this figure.

4. The Dynamic Range must be larger than the overall attenuation obtained

in step 3 for reliable operation.

Mode Operating Wavelength Dynamic Range Model #

Singlemode 1300nm SM Laser 25db FDM Series


GDI Communications LLC Technical Services Bulletin #1

CARE AND HANDLING PROCEDURES FOR

OPTICAL CONNECTORS Author TONY ILETT

Cleanliness Is Very Important When Handling Fiber Optics Specs of dust which are invisible to the human eye, oil or grease from fingers can

contaminate the end surfaces of an optical connector and reduce it’s coupling efficiency to

the point of causing a system to fail.

To put things into perspective the end face of an optical connector is 2.5mm in diameter. In

the center of this is our optical wave-guide or glass fiber; this has a diameter of 125 microns

(125 millionth of a meter) and is about the size of a human hair. In the center of this glass

fiber is an area called the Core, which in Multimode fiber is 50 or 62.5microns in diameter

and is invisible to the naked eye, it is this core that carries our optical signal.

As stated Multimode core diameters are usually 50 microns (Europe) or 62.5 microns (North

America), but in the long haul, high bandwidth world of Singlemode fibers the core size is

80% smaller than the fibers diameter of 125 microns and measures less than 10 microns

across!

It should now be obvious that a spec of dust, invisible the naked eye, can prevent your

communications system from working, so: ------ KEEP IT CLEAN!

Materials needed to clean Optical Patchcords

1. Wet Method

Typically these are lens grade tissue pre-moistened with a solvent that has a

concentration of 90% or better of Isopropyl Alcohol and sealed in a foil sachet.

or

A lens grade tissue, which is then moistened with 90% or better Isopropyl

Alcohol. Do not use rubbing alcohol as this contains oil for lubrication and will

leave a smear or film which will degrade the Optical Return Loss and also cause

particulate matter to stick to it.

or

Dry Method

This involves using a special device that looks like a small videocassette tape

containing a paper like material instead of magnetic tape. The connectors ferrule

is inserted into an opening and the tape is wound on thus polishing the end face.

There are several versions of this device readily available from supply houses.


Note: This only polishes the end surface and does not clean the ferrules

cylindrical surface that contributes to axial alignment.

2. Air Duster

A can of compressed inert gas with a plastic extension tube. Make sure that any liquid

propellant has been discharged from the tube before using on the optics.

3. Lint Free Tissues

Lint free tissues used to clean fiber optic surfaces. Does not introduce any

contaminates. Always keep sealed in a Ziploc bag to avoid contamination when not

in use. Do not re-use the tissue, discard it.

4. Dust Caps

A supply of Clean Dust Caps, note that there are two sizes, one for connectors, the

other one is slightly smaller and is used for the optical ports on patch-panels and

transmission devices. Store them in a Clean Zip-Lock Bag.

The following scenario outlines the steps taken when disconnecting and then re-mating

one end of a Patchcord from an optical device, such as a patch-panel or transmission

equipment.

WARNING!

Invisible Laser Energy Can Damage Your Eyes

• Do not look into the end of an Optical Connector that is attached to a

fiber, it may be emitting potentially harmful energy that can damage

your eyes, first disconnect the other end or turn the power “Off” on the

transmitting device.

• Do not look into the transmitting port of an Optical Transmitter with out

first turning the power “Off” to that device.

Note:

Visible Red LED’s (820nm Multimode) are low power devices that can be

viewed at a safe distance of two to three feet.

Disconnecting the Optical Connector

1. Any accumulation of dust that has settled around the optical connectors must first be

removed by using short bursts of compressed air from the Air Duster. In high dust

areas use pre-moistened tissues or lint free tissues moistened with alcohol to wipe off


excessive dust and then use the Air Duster, this will reduce the possibility of dust

contaminating the optical connector as well as the optical receptacle.

Do not re-use a tissue, discard it. 2. Disconnect the optical connector and put a clean protective dust cap over the end.

If you don’t have a dust cap use a clean Ziploc bag or worst case temporary suspend

the connector in free air and make sure it does not touch any other surface.

Do not leave the exposed receptacle without any protection; cap it with a clean dust

cap!

Reconnecting the Optical Connector

1. Remove the dust cap from the end of the optical connector (if fitted) and store in a

clean Ziploc bag for future use at this site.

Do not touch the ferrules surfaces with your fingers!

2. Using the Air Duster, use short bursts to clear any dust from the connector,

particularly from the ferrule area.

3. Remove the Optic Prep Wipe from a sealed sachet and start the cleaning process.

Do not put the wipe down on any surface as this will contaminate it and render it useless. Using this clean pad, clean the end face of the ferrule and its

circumference. Do not be afraid to apply pressure when cleaning, use the same

pressure as if you were cleaning eyeglasses.

4. Using the Air Duster, use a single short burst to clean and dry the ferrule before

starting the re-connecting process. Do not touch the ferrule again as you might

contaminate it.

5. Remove the dust cap from the mating receptacle and store in the clean Ziploc bag

for future use.

6. Hold the connector locking mechanism between thumb and forefinger. Allow the

little finger to steady the hand by holding it against the chassis or patch-panel

during the insertion process. With the little finger in contact with the panel, there

is a reduced chance of the ferrule touching any contaminated non-mating

surfaces.

7. Insert the ferrule into the receptacle and slowly rotate the connector until the key

aligns itself with the receptacles keyway, then push the connector home and

engage the connectors locking mechanism.

Do not force the connector; it should be a snug fit.

FDM Insert

FDM Series of Fiber Optic Modems

• Multiple Fiber Topologies in One Modem Single Ring, Dual Redundant Rings, Daisy Chain and Point to Point.

• Combination Fiber Optic and FSK Modems Built in FSK Modems for 2/4 wire Copper and Fiber Applications.

• Intuitive Fiber Status Display

Pictorially indicates the switching status of the modem.

• Fiber Identification

Display shows a 1 or 2 to indicate which port the fiber belongs.

• Generates DTE Handshaking

Necessary for Remote Fiber to 2/4Wire FSK to TMC applications.

• Auxiliary Data Port

For 2/4Wire FSK or SS Radio Branch Circuits.

• Built-in Uninterruptible Power Supply

Provides Optical Continuity at a Failed Intersection.

AUXPORT

RJ45

1 RI

3 DTR2 CD

4 SG

RXD 5 TXD 6CTS 7RTS 8

MODEL FDM170GDI Communications LLC

Verdi NV 89439775-345-8000

IN

OUT

R1T2

T1

R2

MODEM

FIBER STATUS

PWR

FAIL

1 8

ENABLE

DISABLE BAT

TER

Y

AU

X C

ON

N

FDM2SA

GDI Communications

TXD

RXD

Data PortsKOD RTS

Anti-Strm

Reset

T1

R2

R1

T2

LOS

LOS

MainDC Power Center

Battery

Alarm Charging

RING 2

RING 1

R1

R2T2

T1

LOS

LOS

PWR

RING STATUS

MAIN DATA ALARM

RESET

ANTI-STREAM

AUX DATA

SERIAL PORT

TXD RXD

TXD RXD

TXD RXD

FDM

2070-6D

GDINEVADA

Fail

R2

T1

T2

R1

FDM2SA

FDM170

FDM2070

FDM-FiberHub

R1 T2

GDI Communications

TXD

RXD

Link Activity

Data Port Anti- Streaming

TXD

RXD

Alarm Reset

AB CD

D

T1

R2

R1

T2

T1 R2

A B

CLOS

LOS

LOS

LOS

MainDC Power Center

Battery

Alarm Charging

FDM-FiberHub

FDM-FSK

GDI Communications

TXD

RXD

Data PortsKOD RTS

Anti-Strm

Reset

T1

R2

R1

T2

LOS

LOS

MainDC Power Center

Battery

Alarm Charging

CD

RTS

2/4 Wire FSKKOD

CTS

TXD RXD

A B

FDM-FSK

Stand Alone Models Plug-in Models for Controllers and Racks


Contents of this user guide may not be copied or published without the written consent of GDI Communications LLC, Verdi, Nevada.

The contents of this user guide are deemed to be correct at the time of publishing and are offered as a guide only; GDI

Communications LLC is not liable for any inaccuracies or omissions.

fdm series insert - gdi communications controller user guide fdm series all fiber ... the fdm2070-6d...

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