Nortel T1/SMDI Configuration Manual page 162

CallPilot T1/SMDI interfaces
CallPilot T1 clocking requirements
Timing
Timing Synchronization
Clock and data recovery
Jitter tolerance
CallPilot T1 clocking synchronization
CallPilot T1 links must be configured to establish the correct timing
synchronization mode. In T1 systems, one end of each link must be
configured as a timing master to provide a timing reference to the far end.
The other end must be configured as a timing slave that uses T1 timing
derived from the loop to time outgoing data. If both ends of a T1 link are
configured as master-timed, T1 slips cause periodic signal distortion. The
following table shows the correct timing configuration for CallPilot timing
synchronization.
Connecting
equipment timing
mode
Line Side T-1
(always master-timed)
Channel Bank
(slave mode suggested)
162
Description
CallPilot Configuration:
slave-timed when interconnecting to
synchronous digital hierarchy equipment
master-timed when interconnecting to
other equipment (for example, analog
channel banks)
Complies with AT&T TR62411 and Bellcore
TA-TSY-000170
Complies with AT&T TR62411 and ANSI
T1.403b-2002
CallPilot timing mode
(first T1 Link)
Slave (mandatory)
Master (suggested)
Standard 1.13
CallPilot timing mode
(all additional T1 links)
Slave (mandatory)
Master (suggested)
CallPilot