Cisco Systems 8600 Series manual Service Types, CBR Service, VBR Service, ABR Service, UBR Service

BXM Capabilities

Service Types

The BXM cards support the full range of ATM service types per ATM Forum TM 4.0.

CBR Service:

•Usage Parameter Control (UPC) and Admission Control.

•UPC: Ingress rate monitoring and discarding per I.371 for:

—Peak Cell Rate (PCR).

—Cell Transfer Delay Variation (CTDV).

VBR Service:

•Usage Parameter Control (UPC) and Admission Control.

•UPC: Ingress rate monitoring and cell tagging per ITU-T I.371 for:

—Sustained Cell Rate (SCR).

—Peak Cell Rate (PCR).

—Burst Tolerance (BT).

•CLP tagging, enabled or disabled on a per VC basis at the Ingress side.

ABR Service:

•Based on Virtual Source Virtual Destination (VSVD) per ATM Forum TM4.0.

•VSVD.

—VSVDs provide Resource Management (RM) cell generation and termination to support congestion control loops.

—A virtual connection queue (VCQ) is assigned to a VC in the ingress direction.

—VCQ configurable parameters:

—CLP Hi and Lo thresholds. Maximum queue depth. Reserved queue depth. Congestion threshold.

•ABR congestion control.

Based on Explicit rate stamping/EFCI cell tagging and ingress rate monitoring per ITU-T I.371.

—ABR with Virtual Source Virtual Destination (VSVD).

—ABR with Explicit Rate (ER) stamping/EFCI tagging.

—ABR with ForeSight.

UBR Service:

•Based on UPC and admission control including EPD.

•Based on Explicit Rate Marking/EFCI cell tagging and ingress rate monitoring per ITU-T I.371.

BXM T3/E3, 155, and 622 6-7