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Chapter 3: System planning
Configuration options for TDD synchronization
Page 3-33
Cluster with PTP-SYNC and GPS receiver
Each PTP link or HCMP sector requires one PTP-SYNC unit. Each site requires one compatible
GPS receiver. Collocated PTP-SYNC units are connected together in a daisy-chain. Between two
and ten PTP-SYNCs may be chained in this way. Use this configuration where a site contains
collocated TDD master ODUs in an extended network and where multiple sites have TDD
master ODUs (
).
The wireless configuration settings are:
•
Master Slave Mode = Master (all ODUs in cluster).
•
TDD Synchronization Mode = Enabled.
•
TDD Sync Device = PTPSYNC (all ODUs in cluster).
•
Cluster Master Slave = Cluster Master (first ODU) and Cluster Slave (others).
•
PTP Sync Site Reference = GPS/1PPS External (all ODUs in cluster).
Figure 50 TDD synchronization configuration – cluster with PTP-SYNC and GPS
Cluster
Master
ODU
GPS
receiver
PTP-SYNC
GPS/
SYNC IN
SYNC
OUT
PIDU
IN
ODU
OUT
ODU
LAN
AC+DC Power
Injector
AC In
Customer
LAN
AC supply
Outdoor CAT5e cable, gel-filled,
shielded with copper-plated steel.
CAT5e cable, foil or braid screened,
with screened connectors.
CAT5e cable, unscreened or
screened.
Ground cable.
Cluster
Slave
ODU
PTP-SYNC
GPS/
SYNC IN
SYNC
OUT
PIDU
IN
ODU
OUT
ODU
LAN
AC+DC Power
Injector
AC In
Customer
LAN
AC supply
Cluster
Slave
ODU
PTP-SYNC
GPS/
SYNC IN
SYNC
OUT
PIDU
IN
ODU
OUT
ODU
LAN
AC+DC Power
Injector
AC In
Customer
LAN
AC supply