Alcatel-Lucent 7750 SR OS Interface Configuration Manual page 382

Configuration Commands
plcd — Reports path loss of codegroup delineation errors. It is applicable only when the value of
crc
Syntax crc {16 | 32}
Context config>port>sonet-sdh>path
Description
A 16 bit CRC can only be configured on an OC-3 channel, all other channel speeds must use a 32 bit
CRC except for the paths configured with encap-type atm at OC3 speed
Default 16 for OC-3, DS-1, DS-3
32 for OC-12, OC-48, ATM-OC12/3, ATMOC-3, etc.
Note: The CRC default is 32 when the encap-type is set to ATM and also, the default cannot be
changed when the encap-type is set to ATM.
Parameters
16 — Use 16 bit checksum for the associated port/channel.
32 — Use 32 bit checksum for the associated port/channel.
encap-type
Syntax encap-type {atm | bcp-null | bcp-dot1q | ipcp | ppp-auto | frame-relay | wan-mirror |
cisco-hdlc}
Context config>port>sonet-sdh>path
Description
This command configures the encapsulation method used to distinguish customer traffic on an access
SONET/SDH channel sub-port.
When the encap-type is set to ATM the CRC default cannot be changed.
When the encap-type is ATM, ATM sub-layer verification (GR-1248-CORE, Generic Requirements
for Operations of ATM Network Elements (NEs)) is automatically enabled. The result of the
verification includes:
The encap-type is only required when configuring a SONET/SDH path for access mode.
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xgig is set to WAN.
Default plcd traps are not issued
• Out of Cell Delineation (OCD) event count. The OCD event count is described in RFC 2515,
Definitions of Managed Objects for ATM Management. Note that multiple events occurring
within a second will be counted as 1 event for ATM and ASAP MDAs as a result of a hardware
limit.
• Loss of Cell Delineation defect/alarm. The LCD defect/alarm is defined in RFC 2515, Defini-
tions of Managed Objects for ATM Management. When a path is in an LCD defect state, the
path's operational status will be down. When a path exits the LCD state, the path's operational
status will change to up (assuming nothing else causes the path to stay down). A trap is raised to
indicate the LCD status change. Also a P-RDI is sent to indicate the defect to the remote end.
7750 SR OS Interface Configuration Guide