Interface Configuration
7750 SR OS Interface Configuration Guide Page 197
Configuring ATM Interface Parameters
ATM interface parameters can only be configured for SONET/SDH ports/paths and TDM ports/
channels supporting ATM encapsulation, and for IMA multilink bundles.
ATM interface parameters allow users to configure characteristics of an ATM interface. The 7750
SR product family supports configuration of the following ATM interface characteristics:
• Cell-format — Allows user to select the ATM cell format to be used on a given interface:
UNI/NNI
• ILMI — Allows user to enable/disable ILMI protocol
• Traffic-desc — Allows user to configure ILMI PVCC TM characteristics over a given
ATM interface ingress and egress direction characteristics can be configured separately)
• Mapping — Allows user to select ATM cell mapping into an HDLC frame: Direct/PLCP
PLCP/Direct Mapping
Setting mapping to PLCP changes the effective speed of a DS3 interface to 40.704 M. When a port
operates in a PLCP mode, the OCD events and LCD are not applicable (including related status
fields and counters).
Similarly the below-defined PLCP statuses, alarms, counters do not apply for direct mapped ports.
When a path operates in the PLCP mode, 7750 SR supports the standard ATM MIB monitoring of
the PLCP operations, for example:
• PLCP severely errored framing seconds
• PLCP alarm state
• PLCP unavailable seconds counter
Table 28 illustrates how SONET alarm status, path operational status, ATM interface and PLCP
status and PLCP Alarm state interact:
To Next Page
Loading...
