EXFO IQS-8120NGE, Руководство пользователя

Страница: 400 / 546

System Tabs
386
IQS-8500 Series and IQS-8120NGE/8130NGE
Clock Synchronization

Line Coding : Allows the selection of the interface line coding. Choices
are:
For DS1 : AMI and B8ZS . The default setting is B8ZS .
For E1
:
AMI
and
HDB3
. The default setting is
HDB3
.

Framing : Allows the selection of the interface framing. Choices are:
For DS1
:
SF
, and
ESF
. The default setting is
SF
.
For E1 : PCM30 , PCM30 CRC-4 , PCM31 , and PCM31 CRC-4 . The default
setting is
PCM30
.
Alarm Analysis
Note:
Only LOPPS-L alarm is available with 1PPS signal.

LOS (Loss Of Signal): The LOS alarm indicates absence of an input
signal or an all-zeros signal is received.

AIS (Alarm Indication Signal): The AIS alarm is declared when an
unframed all-ones signal is received.

LOF (Loss Of Frame):
For DS1:

With SF Framing: The Loss-of-Frame condition will be assumed
when 2 terminal frame and/or signaling frame errors in 5
consecutive frames have been received.

With ESF Framing: The Loss-of-Frame condition will be assumed
when 2 FPS frame errors in 5 consecutive frames have been
received.
For E1 : The Loss-Of-Frame condition will be assumed when three
consecutive incorrect frame alignment signals have been received.