363-206-305
Circuit Pack Descriptions
7-50
Issue 3 June 2000
using the same STS-1 time slot. This dual 0x1 interface also provides route
diversity for point to multi-point interconnectivity and route restoration to data
networking devices utilizing the BBG19s for access to the SONET network.
Fault Detection Circuitry
7
The BBG19 DS3 circuit pack has in-service and out-of-service built-in test
capability. In-service testing is continuous and errors are reported when they
occur to the SYSCTL via the intra-shelf control bus. An out-of-service test is
performed whenever the BBG19 DS3 circuit pack is inserted or recovers from a
transient failure.
The incoming DS3 signal is monitored for bipolar threshold crossings in excess of
10
-3
or 10
-6
, LOS, DS3 OOF, and DS3 AIS. Incoming STS-1 signals are monitored
for STS AIS, STS LOP, and yellow and are also monitored for DS3 OOF and AIS.
Loopbacks
7
Two loopbacks are provided on the BBG19 DS3. The terminal loopback bridges
the DS3 desynchronizer output signal (transmitted toward the data services
device) back into the DS3 synchronizer input. Operation of the loopback does not
affect the signal transmitted to the data services device. The facility loopback
bridges the STS-1 output signal to the OLIU back toward the data services device.
Operation of this loopback does not affect the signal transmitted to the fiber. Both
loopbacks are controlled by the SYSCTL through the intra-shelf control bus.
Performance Monitoring
7
The BBG19 DS3 circuit pack provides PM circuitry for the following performance
parameters:
â–
STS path parameters derived from B3 coding violations
â–
DS3 path parameters derived from P-bit coding violations
â–
DS3 path parameters derived from F&M bit errors
â–
DS3 line errors based on B3ZS violations
â–
DS3 P-bit and F&M bit PM for both directions of transmission
â–
C-bit parity and FEBE PM for both directions of transmission.
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