Alcatel-Lucent 7750 Configuration Manual page 463

to WAN.
Default
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.
The no form of this command restores the default.
7750 SR Interface Configuration Guide
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, Definitions
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.
Interface Configuration
Page 463