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Cisco MGX 8800/8900 Series Hardware Installation Guide
Releases 2 - 5.2, Part Number OL-4545-01, Rev. H0, May 2006
Chapter 2 Illustrated Card List for MGX Switches and the MGX 8880 Media Gateway
Front Cards
VXSM OC-3/STM-1 Interface
VXSM OC-3/STM-1 back cards (part VXSM-BC-4-155) use the Cisco industry-standard Small
Form-Factor Pluggable (SFP) modules. SFPs minimize operations and sparing costs by allowing VXSM
OC-3/STM-1 back cards to be easily adapted to various types of optical interfaces. For example, a
VXSM OC-3/STM-1 back card with Multi-Mode Fiber (MMF) interfaces can be quickly changed to
Single-Mode Fiber (SMF) by removing the MMF modules and inserting SMF modules. Table 2-37
provides information about the VXSM OC-3/STM-1 back card interfaces.
VXSM T1/E1 Interface
The VXSM T1/E1 back card (part VXSM-BC-24-T1E1) supports up to 48 ports. The VXSM T1/E1 back
cards are deployed in pairs; each supporting 24 T1/E1 ports. Table 2-38 provides information about the
VXSM OC-3/STM-1 back card interfaces.
Table 2-37 VXSM OC-3/STM-1 Back Card Interfaces (Part VXSM-BC-4-155)
MMF
SMF Intermediate
Reach (SMF-IR)
SMF Long Reach
(SMF-LR)
Port speed 155 Mbps 155 Mbps 155 Mbps
Maximum number of ports 4 4 4
Port media MMF SMF SMF
Port connector LC LC LC
Optics LED 1310 nm LED 1310 nm LED 1310 nm
Tx power level (dBm) –19 min
–14 max
–15 min
–8 max
5 min
0 max
Rx power level (dBm) –30 min
–14 max
–28 min
–8 max
–34 min
–10 max
Typical reach (km) 2 15 40
Redundancy 1:1 1:1 1:1
Line protection APS 1+1 APS 1+1 APS 1+1
Table 2-38 VXSM T1E1 Back Card Interfaces (Part VXSM-BC-24T1E1)
Parameter T1 E1
Port speed 1.544 Mbps 2.048 Mbps
Maximum number of ports per back
card
24 24
Port media 100-ohm twisted pair 120-ohm twisted pair
Port connector 50-pin Amphenol 50-pin Amphenol
Line coding Binary 8-zero substitution (B8ZS) or
alternate mark inversion (AMI)
HDB3 or AMI
Line framing ANSI T1.408 Extended Superframe,
Super Frame format line framing
ITU-T G.704 basic frame, multiframe, cyclic
redundancy check (CRC) framing
Redundancy 1:1 1:1