Demand test descriptions and error codes - Avaya Support

STRAT-3 (Stratum-3 Clock)
S8700-series Fiber-PNC only
STRAT-3 (Stratum-3 Clock)
MO Name in Log Alarm Level Initial Command to Run Full Name of MO
STRAT-3 MAJ
MIN
test synchronization Stratum-3 clock
The Digital Synchronization Network Plan (PUB 60110) specifies a hierarchy of synchronization
nodes consisting of Strata 1 to 4, where the public network’s sole Stratum-1 clock is the most
accurate. Release 5r and later systems support both Stratum-3 and -4 operations. See
Stratum-4 Synchronization for details on Stratum-4 operation.
A Stratum-3 clock derives its timing from two DS1 references connected to a Stratum-3 or better
source. The Stratum-3 clock provides a holdover of at least 24 hours should both DS1
references fail. After 24 hours, the Stratum-3 clock still provides service but its accuracy may be
degraded. The Digital Synchronization Network Plan (PUB 60110) requires that the Stratum-3
clock have duplicated components.
The Stratum-3 clock can be configured with only one DS1 input if one of the Clock Input cards is
removed. Also, the Stratum-3 clock can free run (use its internal clock without using DS1 inputs,
if both Clock Input cards are removed).
Only a TN780 Tone-Clock circuit pack recognizes and supports a Stratum-3 clock and its alarm
signals. The TN780 Tone-Clock circuit pack is also backward- compatible with a TN768
Tone-Clock circuit pack. The Stratum-3 clock may be connected to a non IPSI PN where a
TN780 Tone-Clock circuit pack resides. The Stratum-3 clock should never be connected to an
IPSI connected PN.
The only operation that software can perform is a query of the alarm leads. The only recovery
action that can be performed on a catastrophic failure of the Stratum-3 clock is using the local
oscillator on the active TN780 Tone-Clock circuit pack. Neither software nor the TN780
Tone-Clock circuit pack can request additional information about the health of the Stratum-3
clock other than the information provided by the alarm leads. Furthermore, neither the software
nor the TN780 Tone-Clock circuit pack can request that the external clock switch references,
change configuration, disable/enable, initialize, and so forth.
In the system, the Stratum-3 clock has been implemented as an external which follows the
specification in PUB 60110 for Stratum 3. The only external Stratum-3 clock that is supported is
the Telecom Solutions Digital Clock Distributor for Customer Premise Timing (DCD-CPT)
Stratum-3 clock. Figure 73: Stratum-3 Clock Hardware Configuration shows how the Stratum-3
hardware configuration provides clock and alarm signals to the TN780 Tone-Clock circuit
pack(s). The reference DS1 facilities connect directly to the Stratum-3 clock for timing purposes,
but the DS1 data may be routed into the switch by using a Y connector (H-600-274 G1 for the
50-pin DS1 end or H-600-274 G2 for the 15-pin DS1 end).
For more information about installing a Stratum-3 clock, refer to Maintenance for the Avaya
S8700 Media Server with an Avaya SCC1 Media Gateway or an Avaya MCC1 Media Gateway,
555-233-143.
Issue 5 May 2009 883