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Technical Specifications
Issue 3 June 2001
10-9
— ATM Virtual Path ID and Virtual Channel ID
— IMA group ID
— IMA Frame Length - 32, 64, 128, 256
— ATM scrambler - on/off
— ATM polynomial - on/off.
The IMA link IDs are assigned automatically by the system in the range 0 to
7. The IMA protocol operates in symmetric configuration with common
clock.
■ Alarms:
Local LAN port failures are detected by monitoring for the presence of
either MAC frames or Link Pulses per IEEE 802.3. From the SONET
direction, failures are detected by monitoring for VT1.5 (AIS, LOP), DS1
LOF, Loss of IMA frame, Loss of IMA Delay Synchronization (LODS), Loss
of Cell Delineation (LCD) and excessive AAL5 CRC errors. The alarm level
for a local LAN port failure is user provisionable (Major, Minor, Not
Alarmed).
■ Performance Monitoring:
In addition to DS1 path and VT1.5 path performance monitoring, the
BBF10 circuit pack supports performance monitoring of data flow in both
directions. The parameters supported are:
— Transmit MAC packets forwarded (towards the WAN)
— Transmit MAC packets discarded
— Receive MAC packets forwarded (towards the LAN)
— Receive MAC packets discarded.
In addition, to monitor the efficiency of the IMA link the following
parameters are supported:
— Transmit ATM cells total
— Transmit ATM idle cells
— Receive ATM cells total
— Received ATM cells Idle.
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