Trunk Cards 4-7
Universal Switching Module Enhanced
•The maximum throughput is 310 Mbps—two times the OC-3 (STM1) rate. This maximum
applies whether the back card is a 2-port or 4-port back card. In practical application, this
maximum rate means that most trunk applications with an OC-3 interface would use the 2-port
back card.
•The UXM-E supports ATM-to-Frame Relay network and service interworking.
•Forthe ABR connection types, the UXM-E supports EFCI marking, Explicit Rate Stamping, and
Virtual Source/Virtual Destination (VS/VD).
•The UXM-E supports Y-cable redundancy with hot standby for very fast switchover.
•The front card has 128K cell buffers.
•For statistics support, the UXM-E provides real-time statistics counters and interval statistics
collection for ports, lines, trunks, and channels.
•The UXM-E can form a logical trunk by grouping more than one T1 or E1 port. The name of this
(purchased) option is Inverse Multiplexing over ATM (IMA).
•The on-board diagnostics are loopback,self-test, and background.

UXM-E Interfaces

Table4-4 is a list of the UXM-E back cards. Figure 4-3 shows the UXM-E front card. Table 4-5
defines all possible combinations for the states of the front card status LEDs (Fail, Active, and
Standby).
Table4-4 Back Cards for the UXM-E
Card Name Card Description
BC-UAI-4-155-MMF 4-port multimode fiber 155 Mbps
BC-UAI-4-155-SMF 4-port single mode fiber 155 Mbps
BC-UAI-2-155-SMF 2-port single mode fiber 155 Mbps
BC-UAI-2-SMFXLR 2-port single mode fiber XLR
BC-UAI-4-SMFXLR 4-port single mode fiber XLR
BC-UAI-4-STM1E 4-port synchronous transport module-1E
BC-UAI-6-T3 6-port T3 back card
BC-UAI-3-T3 3-port T3 back card
BC-UAI-6-E3 6-port E3 back card
BC-UAI-3-E3 3-port E3 back card
BC-UAI-4-T1-DB-15 4-port T1 back card with DB-15 connector
BC-UAI-8-T1-DB-15 8-port T1 back card with DB-15 connector
BC-UAI-4-E1-DB-15 4-port E1 back card with DB-15 connector
BC-UAI-8-E1-DB-15 8-port E1 back card with DB-15 connector
BC-UAI-4-E1-BNC 4-port E1 back card with BNC connector
BC-UAI-8-E1-BNC 8-port E1 back card with BNC connector