Chapter 3 System Features
AC 60 Software Features
3-34
255-700-025
PacketStar
™
Access Concentrator 60 User Guide
, Issue 1
Release 6.3.0
declares a Loss of Signal (LOS) after a violating period (20 +/- 3
microseconds) of consecutive all zero bytes, or zero optical power, is detected
in the received signal.
•
The MS-AIS alarm is cleared after the receiver removes an LOS. This
occurs when two valid framing patterns (A1, A2) are received and no
violations have been detected.
Loss of Frame (LOF)
Modules: Channelized DS3, DS1 IMA
A network element (NE) will transmit a Loss of Frame (LOF) alarm when an
Out of Frame (OOF) condition persists for 2.5 s/- 0.5 seconds
(except when the AIS defect or failure is present.)
•
The LOF alarm stops when the NE detects valid framing for 20 seconds or
when the AIS defect is detected.
Modules: DS3 IMA, DS3 ATM, DS3 Frame Relay
A network element (NE) will transmit a Loss of Frame (LOF) alarm when an
Out of Frame (OOF) condition persists for 2.5 s/- 0.5 seconds.
•
The LOF alarm stops when the NE detects valid framing for 10.0 seconds
+/- 0.5 seconds.
Modules: E3 ATM, OC-3 MM APS, OC-3 MMAQ, OC-3 MMTS, OC-3 SM APS, OC-3
SMAQ, OC-3 SMTS, STM-1 MM MSP, STM-1 MMAQ, STM-1 SM MSP, STM-1
SMAQ, STM-1 SMTS
A network element (NE) will transmit a Loss of Frame (LOF) alarm when an
Out of Frame (OOF) condition persists for 3 milliseconds or longer.
•
The LOF alarm stops when the NE receives a valid signal for 3
milliseconds.
Note:
In order to account for intermittent out-of-frame conditions, the 3
milliseconds time is not reset to zero until an in-frame condition
persists for more than 3 milliseconds.
Alarm Indicator
Signal (AIS)
Module: DS1 IMA
A network element (NE) will transmit an AIS alarm when it detects a defect
on the unframed, all ones AIS signal for 2.5 s/- 0.5 seconds, or when
it detects a Loss of Frame (LOF). In this situation, the NE will also transmit a
RAI upstream.
•
The AIS alarm stops when the NE receives a valid signal for 20 seconds.
Modules: Channelized DS3, DS3 IMA, DS3 ATM, DS3 Frame Relay
A network element (NE) will transmit an AIS alarm when it detects an AIS
defect that persists for 2.5 +/- 0.5 seconds. In this situation, the NE will also
transmit RDI upstream.
•
The AIS alarm stops when the NE receives a valid signal for 10.0 seconds
+/- 0.5 seconds.
Содержание PacketStar AC 60
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