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