Maintenance Description
9-2 Issue 8.0 July 2002
â– Telemetry remote access: The telemetry byte-oriented serial (TBOS)
protocol reports remotely as much detailed failure information as
necessary to allow repair decisions to be made for networks.
A message-based operations system may also access the FT-2000 OC-48
Add/Drop-Rings Terminal, using the TL1/X.25 interface.
Maintenance Signals 9
The following maintenance signals are generated and detected by the FT-2000
OC-48 Lightwave System.
â– Alarm indication signals (AIS): Alarm indication signals notify
downstream equipment that a failure has been detected and alarmed by
some upstream equipment, if the upstream alarm has not been
suppressed. Alarm indication signals include SONET line AIS, STS-1 path
AIS, and DS3 AIS.
â– Upstream failure indications signals: Upstream failure indication signals
notify upstream equipment that a downstream failure has been detected.
Upstream failure indication signals include line remote defect indicator
(RDI-L) and path remote defect indicator (RDI-P) signals.
â– Path unequipped signal: The path unequipped signal is transmitted to
notify downstream equipment that the STS-1 path is incomplete (for
example, a low-speed interface slot in the AUTO state or the absence of a
valid cross-connection). The DS3 circuit pack is the only low-speed
interface circuit pack that terminates the STS-1 path overhead. Thus, the
STS1E and OC3 (1.3 STD) circuit packs pass through any path
unequipped signals. In Release 4.1, when a DS3 circuit pack detects a
path unequipped signal on a DS3 circuit, a DS3 path unequipped
condition is reported. In Release 5 and later releases, when a DS3 circuit
pack detects a path unequipped signal on a DS3 circuit, a path
integrity failure condition is reported.
â– Path trace signal: The path trace signal is transmitted repetitively to verify
the continuity of the STS-1 path. The DS3 circuit pack is the only
low-speed interface circuit pack that generates or terminates the STS-1
path overhead. Thus, the STS1E and OC3 (1.3 STD) circuit packs pass
through any path trace signals. In Release 4 and later releases, the value
of the transmit and receive expected path trace signals is provisionable for
DS3 circuits only. The value of the provisionable receive expected path
trace signal is compared to the actual received path trace signal to verify
STS-1 path continuity. For more information about provisioning path trace,
refer to Volume I, Section 8, "Administration and Provisioning." For more
information about the path trace report, refer to Volume I, Section 11, "Craft
Interface Terminal Usage."
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