Specifications

2-25
Cisco IGX 8400 Series Provisioning Guide, Release 9.3.3 and Later Releases
OL-1166-04
Chapter 2 Cisco IGX 8400 Series Cards
Universal Switching Module
UXM-E Trunk Mode Features
In trunk mode, the UXM-E supports up to 8000 connections. The UXM-E in trunk mode cannot support
more than 4000 gateway connections. All remaining connections can be either user or networking
connections. For example, if you configure 2500 gateway connections, you still have 5500 connections
available to be used for networking connections.
Between the network and customer premise equipment (CPE), the UXM-E communicates only ATM
cells. However, on the cellbus, the UXM-E communicates either ATM cells or FastPackets, depending
on the destination card type.
Traffic Management Features
Table 2-16 provides a summary of the traffic management features available on the UXM-E.
Table 2-16 Traffic Management Features Supported on the UXM-E
Card Mode Traffic Management Feature
Both (port & trunk) Supports ATM-to-FR service interworking, network interworking, and the
following ATM traffic classes:
• CBR
• VBR
• ABR
• UBR
Both Supports partial packet discard (or tail packet drop) and early packet discard for
AAL5 virtual circuits (VCs)
Both Supports user-configurable congestion thresholds
Trunk Supports the following additional traffic classes through FastPacket-based or
interworked connections:
• High-priority
• Timestamped
• Non-timestamped
• Bursty data A
• Bursty data B
Port (UNI/NNI) Supports PCR-linked policing of ABR connections
Port Supports the following control options for ABR connections where the ABR
control loop does not terminate at the connection endpoints:
• EFCI
• Relative rate
• Explicit rate