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Acom Line Subrack (ALS)
025-9599A.1
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Limited Warranty
Buyer assumes responsibility for the selection of the Products to achieve buyer's or its customers intended results obtainedfrom the Products. If buyer has provided Zetron with any requirements, specifications or drawings, or if Zetron provides
buyer with such materials, such materials are provided solely for buyers convenience and shall not be binding on Zetronunless agreed in writing by the President of Zetron. ZETRON DOES NOT WARRANT THAT THE PRODUCTS OR ITSCUSTOMERS REQUIREMENTS OR SPECIFICATIONS OR THAT OPERATION OF THE PRODUCTS WILL BEUNINTERRUPTED OR ERROR FREE. SUBJECT TO THE LIMITATIONS SET FORTH BELOW, Zetron warrants that
all Zetron Products and Zetron Accessories will be free from material defects in material and workmanship for one yearfrom date of shipment (except where indicated otherwise in the Zetron Price Book). For buyers convenience, Zetron may
purchase and supply additional items manufactured by others. In these cases, although Zetrons warranty does not apply,
buyer shall be the beneficiary of any applicable third party manufacturers warranties, subject to the limitations therein.Zetron's warranty covers parts and Zetron factory labor. Buyer must provide written notice to Zetron within the warranty
period of any defect. If the defect is not the result of improper or excessive use, or improper service, maintenance orinstallation, and if the Zetron Products or Zetron Accessories have not been otherwise damaged or modified after shipment,AS ZETRON'S SOLE AND EXCLUSIVE LIABILITY AND BUYER'S SOLE AND EXCLUSIVE REMEDY, Zetron shall
either replace or repair the defective parts, replace the Zetron Products or Zetron Accessories or refund the purchase price, atZetron's option, after return of such items by buyer to Zetron. Shipment shall be paid for by the buyer. No credit shall beallowed for work performed by the buyer. Zetron Products or Zetron Accessories which are not defective shall be returned at
buyer's expense, and testing and handling expense shall be borne by buyer. Out-of-warranty repairs will be invoiced at the
then - current Zetron hourly rate plus the cost of needed components. THE FOREGOING WARRANTY AND THE THIRD
PARTY MANUFACTURER'S WARRANTIES, IF ANY, ARE IN LIEU OF ANY AND ALL OTHER WARRANTIESEXPRESSED, IMPLIED OR ARISING UNDER LAW, INCLUDING, BUT NOT LIMITED TO, THE IMPLIEDWARRANTIES OF MERCHANTABILITY, NON-INFRINGEMENT AND FITNESS FOR A PARTICULAR PURPOSE.
Limitation of Liability
Zetron makes no representation with respect to the contents of this document and/or the contents, performance, and functionof any accompanying software. Further, Zetron reserves the right to revise this document or the accompanying software and
to make changes in it from time to time without obligation to notify any person or organization of such revisions or changes.
ZETRON SHALL NOT UNDER ANY CIRCUMSTANCES BE LIABLE TO BUYER OR ANY THIRD PARTY FOR
ANY INCIDENTAL, SPECIAL, CONSEQUENTIAL OR INDIRECT LOSS OR DAMAGE ARISING OUT OF ORCONNECTED WITH BUYER'S PURCHASE OR USE OF PRODUCTS OR SERVICES, INCLUDING WITHOUT
LIMITATION, LOSS OF USE, LOSS OR ALTERATION OF DATA, DELAYS, LOST PROFITS OR SAVINGS, EVEN
IF ZETRON HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES AND EVEN IF THE LIMITEDREMEDY ABOVE IS FOUND TO FAIL OF ITS ESSENTIAL PURPOSE. IN NO EVENT SHALL ZETRON'SLIABILITY (WHETHER FOR NEGLIGENCE OR OTHER TORT, IN CONTRACT OR OTHERWISE) EXCEED THE
PRICE PAID TO ZETRON FOR THE PRODUCTS.
IP networks by their nature are subject to a number of limitations, such as security, reliability, and performance. Anyone
using non-dedicated IP networks, such as shared WANs or the Internet, to connect to any Zetron Products or systems shouldconsider and is responsible for these limitations.
Zetron, Inc. All rights reserved. This publication is protected by copyright; information in this document is subject to changewithout notice. Zetron and the Zetron logo are registered trademarks of Zetron, Inc. Other company names and productnames may be the trademarks or registered trademarks of their respective owners. This publication may not be reproduced,
ranslated, or altered, in whole or in part, without prior written consent from Zetron, Inc.
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3
Compliance Statements
The regulatory compliance of an Acom Line Subrack (ALS) depends on the cards that are installed in the subrack. Forcompliance information, refer to the line cards manual of each type of line card installed in the ALS.
Products and batteries with the symbol (crossed-outwheeled bin) cannot be disposed as householdwaste. Old electrical and electronic equipment and
batteries should be recycled at a facility capable ofhandling these items and their waste byproducts.
Contact your local authority for details in locating arecycle facility nearest to you.
Proper recycling and waste disposal will helpconserve resources whilst preventing detrimentaleffects on our health and the environment.
Notice: The sign Pb below the symbol forbatteries indicates that this battery contains lead.
Information on Disposal of Old Electrical and Electronic Equipment and
Batteries (applicable for EU countries that have adopted separate wastecollection systems)
Safety Summary
STOP
Warning! For your safety and the protection of the equipment, observe these
precautions when installing or servicing Zetron equipment.
Follow all warnings and instructions marked on the equipment or included in documentation.
Only technically qualified service personnel are permitted to install or service the equipment.
Be aware of and avoid contact with areas subject to high voltage or amperage. Because somecomponents can store dangerous charges even after power is disconnected, always discharge
components before touching.
Never insert objects of any kind through openings in the equipment. Conductive foreignobjects could produce a short circuit that could cause fire, electrical shock, or equipmentdamage.
Remove rings, watches, and other metallic objects from your body before openingequipment. These could be electrical shock or burn hazards.
Ensure that a proper electrostatic discharge device is used, to prevent damage to electroniccomponents.
Do not attempt internal service of equipment unless another person, capable of rendering aidand resuscitation, is present.
Do not work near rotating fans unless absolutely necessary. Exercise caution to prevent fansfrom taking in foreign objects, including hair, clothing, and loose objects.
Use care when moving equipment, especially rack-mounted modules, which could becomeunstable. Certain items may be heavy. Use proper care when lifting.
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4 025-9599A.1
Change List for Rev A, 17 February 2010
First released version.
This document replaces the ALS section in 025-9574.
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Overview
5
Contents
Acom Line Subracks ........................................................................................ 7
Overview ................................................................................................................................ 7
Mounting ................................................................................................................................ 9Card Installation ................................................................................................................... 10Cloning an Acom ALS .................................................................................................. 12
Electrical Isolation ................................................................................................................ 13Grounding ............................................................................................................................ 15
Building Earth Conductors ........................................................................................... 15Acom Earth Connections ............................................................................................. 15
Signal Cable Connections ................................................................................................... 17Standard Cable Assemblies......................................................................................... 17Connection of Cable Shields........................................................................................ 18Surge Suppression and Protection .............................................................................. 18
Digital Trunked Radio Gateway ........................................................................................... 19Specifications ....................................................................................................................... 21
Power Connection ........................................................................................................ 21Absolute Maximum Ratings ......................................................................................... 21Physical Characteristics 19 in. Subrack .................................................................... 22Mean Time Between Failure ........................................................................................ 22
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Overview
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Overview
7
Acom Line Subracks
Overview
An Acom Line Subrack (ALS) is an enclosure that houses circuit cards for doing specific
functions. The circuit cards control the functionality of the Acom system. Each type ofcircuit card is specific to a type of function, and by installing different card combinations,gives the system new capability for performing different applications. Also, because the
cards are easy to install and combine, system redundancy and robustness are easy tocreate.
Figure 1: Cabinet Configurations
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Overview
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Installation of the Acom Line Subracks may involve the following activities described inthis document:
Adequate and reliable power must be available to the subracks in accordancewith isolation and safety requirements described in applicable standards, local
statutes, and codes of practice.
All power connectors must be compatible with subracks.
Proper grounding must be available for the subracks.
ALSs are typically housed in 45 RU cabinets. 1 Rack Unit (RU) equals 1.75 in (4.45 cm).You can combine ALSs that have different card population types to create different
functionality.
In a redundancy configuration, if an ALS goes offline for any reason, the ChangeoverSubrack automatically switches operation to another ALS so that no functionality is lost.
The standby ALS becomes the main ALS. (SeeFigure 1.)
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Mounting
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Mounting
The subrack is a 6-RU high, 19-inch card frame with dimensions as listed in the Acom
Line Subrack specifications. The Acom subrack has side mounting flanges with 7 mmdiameter holes spaced as shown inFigure 2.Recommendations for mounting a subrackare as follows:
A space of one RU minimum should be provided at the top and bottom of thesubrack to provide adequate ventilation. The space at the bottom of the subrack
also provides space for cable entry to line cards.
A minimum clearance of 50 mm must be provided at the rear of the subrack forelectrical clearance.
Connection of standard cable assemblies must be in accordance Zetron standards.
Installation of required primary surge protection devices (e.g., gas discharge
arresters) must be in accordance with Zetron standards.
Figure 2: Subrack Mounting Hole Arrangement
190 mm
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Card Installation
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Card Installation
An Acom Line Subrack (ALS) has positions for 13 plug-in cards. The positions are
numbered 0 to 12 from left to right across the subrack as shown inFigure 3.
The following lists the circuit cards that are typical to a system installation:
Card Description
CCC Changeover Control Card
COV-T 3-Way Coaxial Switch
COV-V or COV-R 48/96 Way Switch
DIU1-2 Data Interface Unit, RS-232, 6-channel
DIU1-4 Data Interface Unit, RS-422, 6-channel
EIE Exchange Interface Unit
EMU 4-Wire E&M Interface Unit
MCU Main Control UnitMSU Main Supply Unit
RGU Ring Generator Unit
RIU Radio Interface Unit
SMU Signaling Management Unit
TIE Telephone Interface Unit
UIO Universal Input/Output Unit
All system cards use DIN41612 style connectors to connect to the subrack backplane.Cards should be inserted carefully to ensure that the card edges are in the guide slots
before firmly mating the rear connector with the backplane.
Figure 3: Fully Populated ALS
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Card Installation
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Some cards may require setting jumper links and DIP switches prior to installation in thesubrack. This information is provided in the installation description for each card. The
rules for installing cards at a system level are as follows and listed inTable 1.
An ALS must have an MCU card in slot 0; this card becomes the Primary MCU.
An ALS must have an MSU card in slot 12.
An additional MSU card may be fitted in Slot 11; in this slot the MSU works as aredundant/backup power supply. When there is no second MSU this slot becomesavailable to line cards.
Slot 1 can only be used for MCU, SMU, RGU, or UIO cards.
If fourteen G.703 interfaces are present (i.e., seven MCU duals), all cards mustbe installed before power-up. In this configuration the cards are no longer hotpluggable.
Figure 4: Acom ALS Layout
2 3 4 5 6 7 8 9
M
S
U
1210
Empty
slot
1110
M
C
U
Empty
slot
Empty
slot
Empty
slot
Empty
slot
Empty
slot
Empty
slot
Empty
slot
Empty
slot
Empty
slot
Empty
slot
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Card Installation
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Table 1: Acom Line Subrack Card Installation
Slot Number
0 1 2 3 4 5 6 7 8 9 10 11 12
MCU M
DIU1-2
DIU1-4
EIU
EMU
TIE
RGU SeeAcom Ring Generator Unit(P/N 025-9604)
RIU
RVA
EIE
SMU
UIO
MSU M
Legend:
M - (Mandatory) every subrack must have an MCU (single or dual) in slot 0 and an MSU in slot 12.
- A card of this type may be fitted to this slot if required.
- A card of this type must not be fitted to this slot.
Cloning an Acom ALS
Cloning the main configuration from the main rack to the backup rack is a fast way tocopy your changes to the standby ALS and keep both racks in sync. It is assumed that
both ALSs have identical cards. For the procedure, see Cloning an ALSinAcom
Maintenance(P/N 025-9574).
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Electrical Isolation
13
Electrical Isolation
The Acom system is designed to connect and operate with other information technology
and telecommunications equipment. An important aspect of this requirement is to provideisolation for the interfaces and power connections.
In general, the Acom system circuits connected to external lines or toTelecommunications Network Voltage (TNV) circuits have the facility to be isolated
from the backplane supplies. The channels for the EIE, TIE, EMU, RIU, and MSU cardsare intended for external line connection and can be isolated. The main interfaces of the
MCU are designed for G.703 compliance, and the signal lines are isolated with themetallic outer conductors grounded.
The Acom backplane is also designed to provide electrical isolation and is divided into anupper board and a lower board. The upper board carries the Safety Extra Low Voltage(SELV) circuits such as TTL and CMOS signals between cards. The lower board carries
TNV circuits such as the ring voltage, battery voltage. (These may carry hazardousvoltages from external transmission lines.)
Table 2: Acom SELV and TNV Circuits
Hardware SELV TNV
MCU G.703 Interfaces
MSU G.712 Interface
MSU Input Supply
MSU VBATand VV Supplies
TIE interfaces
EIE interfaces
EMU/RIU connected to SELV source
EMU/RIU connected to TNV source
EMU/RIU using backplane source
Ringer Output
Ringer External Input
Upper Backplane
Lower Backplane
External connections to subrack
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Electrical Isolation
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Additional isolation considerations are as follows:
Any cables bundled with external TNV cables are themselves considered to beTNV, even if the lines are local (e.g., to telephones in the same building).
The EMU and RIU have the option of being either TNV or SELV, depending onthe jumper settings of channels. If the jumpers are changed so that referencevoltage is taken from the front connector, the EMU and RIU are isolated from
both TNV and SELV and can be used for either application.
As a special case, if the only TNV connection to the system is through thecoaxial G.703 interfaces, the whole subrack is considered SELV. In this case aSELV approved power supply is required. The jumpers on the EMU could then
be used to provide battery voltage to the E&M leads from the backplane without
violating isolation.
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Grounding
15
Grounding
Building Earth Conductors
There are two types of earth connections required for an Acom installation: protectiveearth (PE) and telecom earth (TRC). PE is the normal building earth used to connectmains voltage. TRC is provided for connecting circuits to a clean earth and is notintended for safety purposes.
Typically, there should be one connection between PE and TRC in the building (subjectto installation requirements and local regulations). The connection point should be as
close to the incoming earth point (earth stake or earth grid connection point) as possible.
Acom Earth Connections
The Acom system provides a number of earth connections at the rear of the subrack. Theconnections provided are shown inFigure 5 on page16.
A description for each connection is described in the following table.
Table 3: Acom Earth Connection
Connection Description PE TRC SELV TNV
J15: 1 and 2 Subrack chassisconnection
J14: 2 and 3 SELV system earth
J18: 1 to 4 SELV electrostatic
discharge protection
J20: 1 +VBAT (DC power
positive supply)
J17: 2 to 4 TNV electrostatic
discharge protection
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Grounding
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Figure 5: Acom Subrack Earth Connections
J13-BATGNDGNDRING
J14
Upper BackplaneJ15
J13PROTECTIVE
EARTH
(PE)
J18
Lower Backplane
J20
J17
TNVESDGNDTELECOMEARTH
(TRC)
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Signal Cable Connections
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Signal Cable Connections
Standard Cable Assemblies
The recommended method of signal cable connection is to use standard cable assemblies,which are available in a range of lengths. The assemblies are fitted with ferrite coreswhen required for compliance to EMC standards. A sample of available types are listedin the following table.
TipMost cable assemblies will designate a length at the end of the part number.
An additional -M or -F indicates meters or feet.
For example, cable 709-7699-10-F D indicates a 10 foot long cable, revision D
(fourth revision of the cable with this number).
Table 4: Acom ALS Cable Assemblies
Part Numbers Cable Assembly
709-0065 Cat5e Cable
709-0146 COV-R to RJ21 Patch Panel Cable
709-7345 MCU Programming Cable
709-7592 SMU Diagnostic cable
709-7607 MSU to tail (Krone)
709-7608 CCC to Krone
709-7612 SMB to SMB
709-7613 BNC to BNC
709-7770 E1 Crossover Cable
709-0161 RIU to COV-R Upper Cable
709-0102 RIU to COV-R Lower Cable
709-7834 EIE to COV-R Upper Cable
709-7828 EIE to COV-R Lower Cable
709-7835 UIO to COV-R Upper Cable
709-7723 UIO to COV-R Lower Cable
709-7868 MCU(T1) to COV-R Upper Cable
709-7869 MCU(T1) to COV-R Lower Cable
950-0550 RJ-21 male to Krone
950-0551 RJ-21 female to Krone
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Signal Cable Connections
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Connection of Cable Shields
Shielding for the G.703 cables must be properly connected during installation toguarantee proper system operation. The metallic bodies of the G.703 SMB connectors
used on the 75-ohm version of the MCU may be connected to ground as required byG.703. Jumper links are provided on the MCU card to connect the shields for receive andtransmit lines as required.
Surge Suppression and Protection
The TIE, EIE, EMU and RIU cards have surge suppression circuits. To work effectivelythe subrack must to be grounded in accordance with the preceding section.
The protection provided by the Acom is considered secondary protection only. If the lines
connected to the Acom can be exposed to direct or near miss lightning strikes, the surgesgenerated can far exceed the rated capacity of the surge suppression circuits. External
protection systems must be installed to ensure that the circuits do not carry the full surgecurrent.
Note Warranty claims for card damage as a result of indirect orinduced lightning strikes will not be accepted.
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Digital Trunked Radio Gateway
19
Digital Trunked Radio Gateway
The Digital Trunked Radio Gateway configuration is used to transmit voice
conversations over data networks using Voice over Internet Protocol (VoIP). A typicalAcom Line Subrack can be configured to handle VoIP signaling requirements for theGateway configuration, allowing voice packet processing. The Digital Trunked RadioGateway contains three types of cards, MCUs, SMUs, and a single MSU. An example of
a Digital Trunked Radio Gateway Acom Line Subrack is shown in the following figure.
Figure 6: VoIP Acom Line Subrack Example
2 3 4 5 6 7 8 9
M
S
U
1210
Empty
slot
1110
M
C
U
M
C
U
S
M
U
S
M
U
S
M
U
S
M
U
S
M
U
S
M
U
S
M
U
S
M
U
S
M
U
CTRL VoiceVoice Voice Voice Voice Voice Voice VoiceHDLC
bridge
Each Digital Trunked Radio Gateway ALS can handle up to ten SMU cards; one controland up to nine voice. One MCU card is used as the main control unit for the entiresubrack and is connected to the DS3 Switch by an E1 link. A Secondary MCU may beused as the HDLC bridge to a hot standby Gateway. The main purpose of the HDLC
bridge is to transfer HDLC messages to keep the main Control SMU and standby Control
SMU in synchronization. Alternatively this link can be configured to operate via the maincommunication channel links between the ALS and the Acoms main switchingequipment. The MSU provides +5 and 12 Vdc power to all the cards in the subrack.
Each SMU card is equipped with one 10Base-T Ethernet controller for connecting to theEthernet LAN. Except for the dedicated control SMU, which processes control messages,all the SMU cards in the Digital Trunked Radio Gateway process VoIP packets and arereferred to as Voice SMUs. Each voice SMU can handle up to 6 talkpaths of voice traffic
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Digital Trunked Radio Gateway
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(incoming and outgoing calls). There is only one control SMU in the main system andone in the standby system.
When processing audio, the SMU card converts PCM data (circuit switch based voice
data) into IP voice packets (packet switch-based voice data) for the outgoing calls, andconverts IP voice packets into PCM data for the incoming calls.
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Specifications
21
Specifications
Power Connection
The input power to the subrack can be anywhere from 20 to 60 Vdc supply. Power isconnected to the subrack in the following ways:
To the MSU in slot 12, which converts the incoming supply to +5, +12 and 12volts and regulates the incoming supply for +VBAT and VBAT voltages. Theoutputs from the MSU are connected to the backplane that powers other cards in
the subrack.
To an optional MSU in slot 11. When two MSU cards are installed, the outputcurrent load is shared between the cards. One card will take up the load if the
other card fails or is switched off. To signaling circuits on the EMU and MSU. This may be required to isolate
signaling circuits from the subrack. Alternately, the signaling circuits may be fedfrom the backplane supply using jumper links on the card.
For card specifications and associated interfaces, refer to the specific cards manual.
Absolute Maximum Ratings
Table 5: Absolute Maximum Ratings
Parameter Conditions
Storage Temperature -10 to 70C (14 to 158oF)
Operating Temperature 0 to 60 C (32 to 140 F)
Operating Humidity 45% RH (non-condensing) @ 45 C (113 F)
Note Absolute maximum ratings for individual cards and associatedinterfaces are described in the card sections.
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Specifications
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Physical Characteristics 19 in. Subrack
Table 6: Physical Characteristics
Parameter Typical Units
Overall Width 482 (19) mm
Overall Depth 346 mm
Overall Height 265 (6 RU) mm
Weight of empty subrack 3.5 Kg
Mean Time Between Failure
Hardware Part Number MTBF (years)*
Backplane Upper 950-0502 237.9
Backplane Lower 950-0501 478.6
* Using HRD5 model (temperature controlled locations)