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Chapter 3: System planning
Configuration options for TDD synchronization
Page 3-34
Cluster with PTP-SYNC and no GPS receiver
Each PTP link or HCMP sector requires one PTP-SYNC unit. PTP-SYNC units are connected
together in a daisy-chain. Between two and ten PTP-SYNCs may be chained in this way. One
ODU is designated as a cluster master. Use this configuration where all master ODUs are
collocated at a single site. As this configuration does not require a GPS receiver, it provides
additional flexibility, particularly in applications requiring rapid deployment (
The wireless configuration settings are:
•
Master Slave Mode = Master (all ODUs in cluster).
•
TDD Sync Device = PTPSYNC (all ODUs in cluster).
•
Cluster Master Slave = Cluster Master (first ODU) and Cluster Slave (others).
•
PTP Sync Site Reference = Internal (all ODUs in cluster).
Figure 51 TDD synchronization configuration – cluster with PTP-SYNC and no GPS
Cluster
Master
ODU
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