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Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, R7.0
Chapter 2 Alarm Troubleshooting
2.7.55 ENCAP-MISMATCH-P
Clear the ELWBATVG Alarm
Step 1 The problem is external to the ONS 15310-CL or ONS 15310-MA. Troubleshoot the power source
supplying the battery leads.
Step 2 If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/techsupport
for more information or call Cisco TAC (1-800-553-2447) in order to report a Service-Affecting (SA)
problem.
2.7.55 ENCAP-MISMATCH-P
Default Severity: Critical (CR), Service-Affecting (SA)
SONET Logical Object: STSTRM
The Encapsulation C2 Byte Mismatch Path alarm applies to the ML-100T-8 Ethernet card. It occurs
when the first three following conditions are met and one of the last two is false:
• The received C2 byte is not 0x00 (unequipped).
• The received C2 byte is not a PDI value.
• The received C2 does not match the expected C2.
• The expected C2 byte is not 0x01 (equipped unspecified).
• The received C2 byte is not 0x01 (equipped unspecified).
(This is in contrast to the “PLM-P” alarm on page 2-115, which must meet all five criteria.) For an
ENCAP-MISMATCH-P alarm to be raised, there is a mismatch between the received and expected C2
byte, with either the expected byte or received byte value being 0x01.
For example, an ENCAP-MISMATCH-P alarm is raised if a circuit created between two ML-100T-8
cards has generic framing procedure (GFP) framing provisioned on one end and high-level data link
control (HDLC) framing with LEX encapsulation provisioned on the other. The GFP-framing card
transmits and expects a C2 byte of 0x1B, while the HDLC-framing card transmits and expects a C2 byte
of 0x01.
A mismatch between the transmit and receive ports on any of the following parameters can cause the
alarm:
• Mode (HDLC, GFP-F)
• Encapsulation (LEX, HDLC, PPP)
• CRC size (16 or 32)
• Scrambling state (on or off)
This alarm is demoted by PLM-P or PLM-V.
Note By default, an ENCAP-MISMATCH-P alarm causes an ML-100T-8 card data link to go down. This
behavior can be modified using the Cisco IOS command line interface (CLI) command no pos trigger
defect encap.
