Interface Configuration
7750 SR Interface Configuration Guide Page 233
The window over which the Bit Error Rate (BER) determined is based on the configured threshold
level. The higher the error rate the shorter the window and as the error rate decreases the window
increases.
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.
Configured BER Threshold Window Length
10^-3 8ms
10^-4 8ms
10^-5 8ms
10^-6 13ms
10^-7 100ms
10^-8 333ms
10^-9 1.66s
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