4
X
E1/G.703 P
LESIOCHRONOUS
M
ULTIPLEXER
O
PERATING
M
ANUAL
IOA77-1F
12
May 2007
3.6 Monitored qualitative parameters of G.703 E1 interface
TM-77 and MD-77 devices are provided with a function of qualitative parameter monitoring.
The devices automatically monitor the interface signal parameters and detect, count and signalize
the following conditions and parameters:
Indicators:
•
LOES
- loss of electrical signal
•
VIOL
- HDB3 code violation on G.703 E1 optical interface
•
AISL
- AIS signal detection on G.703 E1 interface
•
AISR
- AIS signal detection in E1 flux demultiplexed from E2 collective
channel.
•
ES15
- exceeding a 15-minute errored second counter threshold
•
SES15
- exceeding a 15-minute severely errored second counter threshold
•
ES24
- exceeding a 24-hour errored second counter threshold
•
SES24
- exceeding a 24-hour severely errored second counter threshold
Counters:
•
ES15
- 15-minute errored second counter
•
SES15
- 15-minute severely errored second counter
•
ES24
- 24-hour errored second counter
•
SES24
- 24-hour severely errored second counter
•
BBE15
- 15-minute background block error counter
•
BBE24
- 24-hour background block error counter
•
UAS15
- 15-minute unavailability second counter
•
UAS24
- 24-hour unavailability second counter
