transforming vnpt bh network - tane · new soft switch deployments require local clock bits...
TRANSCRIPT
Oct/2017
Frequency: the number of repeated events (e.g. electrical pulses) per second; measured in units of Hertz [Hz] (how often?) – BITs
Phase: the exact point within a single frequency cycle OR time difference between two events; measured in seconds (how long before/after?) – 1PPS
Time of Day (ToD): the actual date and time – year, month, day, hour, minute, second, etc.; measured in seconds (e.g. 2017-10-17, 08:20:15.387.694) (when?) – NTP
All of the Above – PTP 1588v22
Basic terminology
Voice and soft switchesOther TDM systemsSONETDACS
Wireless Local Loop – BITS, NTP/PTP
3
Primary Telco Applications
New soft switch deployments require local clock BITs historically driven from a locally owned clock source,
or by leasing a T1 service from an alternate operator for sync purposes
Leased T1s becoming less reliable Aging Equipment Newer timing protocols
4
Telco Challenges
This complex, large-scale operation heavily relies on various technological means (e.g. radars, comm. systems, etc.) to keep it in order
These systems are mostly interconnected and many of them require high availabilityof timing signals
Leased T1s BITs clock failures NTP equipment End of Life Expanding PTP requirements
5
Similar Challenges
Falcon-MTS
Arrestor
GPS Antenna
Switch DXC SONET IT Wireless
BITS Outputs 1 ….. 32
NTP PTP 1588v2
• Antenna – Clear visibility to sky• Lightning Rods / Tower• Lightning Arrestor and ground• Coax – Antenna to
Arrestor/Arrestor to clock• Clock output to target equipment
Installation ConsiderationsCentral Office
Multiple source inputs Holdover – Rubidium, OCXO, TCXO Redundant clock architectures
7
Timing Network Resiliency
µFalcon-ST/F/GµFalcon-ST/F/G
BITS
Redundant Clocks
CO/Headend
Community BCommunity A
Mutual Redundancy
Voice/SoftSwitch
PTP/NTPBITSPTP/NTPBITS
PTP
GPS – Primary Timing Source PTP – Secondary Source Secondary source provides backup
Voice/SoftSwitch
Telco My Town
µFalcon-ST/F/GµFalcon-ST/F/G
µFalcon-ST/F/GµFalcon-ST/F/G
PTP
BITS
PTP PTP
A B A B
Telco Your Town
Actual Midwest Configuration
BITS
Enabling PTP Propagation
Network elements should be PTP Aware Access Edge Aggregation Core
Edge/regional timing master GPS receiver 33 x BITS clock out, 1 x in 8 x GE ports PTP GM (medium/large scale), BC, TC, Slave NTP Server/Client Stratum 2E holdover w/ a Rubidium pluggable option Stratum 3E OCXO built in 19”/1RU, dual, redundant power supplies Carrier Ethernet capabilities Comprehensive mgmt interfaces, w/ SyncCenter
12
Falcon-MTS
Edge timing master GPS receiver 8 x BITS clock in/out, 8 x GE ports PTP GM (small/med. scale), BC, TC, Slave NTP Server/Client Compact size (half 19”), low power consumption Extended temperature range option Carrier Ethernet capabilities Comprehensive mgmt interfaces, w/ SyncCenter Stratum 3 / 3E holdover 13
uFalcon-ST/F
