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Error and Alarm Response
When it detects a loss of signal (LOS) alarm, the CESM notifies the connected CPE in the upstream
direction after an integration period. The CESM continues to emit cells at the nominal rate but sets
the ATM cell payload with an appropriate data pattern as specified by the ATM Forum CES V2.0
specification. Also, an OAM cell with RDI code goes to the far end to indicate out-of-service. The
significance of the different types of alarms appears in Table 6-3.
Table 6-3
Error
Link Failure
(RX)
Receive RAI
Receive LOF
Receive AIS
Configuring Service on a T3 or E3 CESM
This section first describes the steps for configuring the card, line, and port-level parameters for an
MGX-CESM-T3 and MGX-CESM-E. It then describes how to add a connection. If necessary, refer
to the section titled "Tasks for Configuring Cards and Services" for background information on these
types of tasks. Use either the CLI or the CiscoView application to set up the card and line parameters.
Use either the CLI or the Cisco WAN Manager application to add connections. The fundamental
tasks and applicable CLI commands appear in the following list. For a complete list of CLI
commands that apply to the CESM cards, use the Help command on the CLI of the card or refer to
the tables at the front of the Cisco MGX 8850 Wide Area Edge Switch Command Reference.
•
Optionally configure Y-cable redundancy at the card level (addred on the CLI).
•
Optionally modify resource partitioning at the card level (cnfcdrscprtn)
•
Activate a physical line (addln on the CLI) and optionally configure the line (cnfln) for line
coding, line length, and clock source.
•
Activate the functioning of the logical port on a physical line (addport)
•
Optionally modify resource partitioning at the port level (cnfportrscprtn)
•
Add the connections by using addcon (or addchan if NSAP addressing is necessary)
•
Configure the connection for CDVT, cell loss integration period, and egress buffer size by using
cnfcon (or cnfchan if NSAP addressing is necessary).
CESM Errors and Alarms
Alarm
Down
Type
stream
Blue (LOS)
AIS—OAM
cells
Yellow
None
n/a
Blue (AIS)
AIS (link)
Configuring Service on a T3 or E3 CESM
Up Stream
Comments
none
Data cells According to
ATM-Forum CES-IS V 2.0
None
n/a
Not applicable.
FERF OAM
AIS—done over the T3/E3 link
cells
by sending the AIS data over
the T3/E3 link.
Card and Service Configuration 6-37
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