Specifications

4-28
Cisco ONS 15454 Troubleshooting and Maintenance Guide
November 2001
Chapter 4 Card Reference
XC10G Cross-Connect Card
Figure 4-10 XC10G cross-connect matrix
4.9.1 VT Mapping
The VT structure is designed to transport and switch payloads below the DS-3 rate. The Cisco ONS
15454 performs Virtual Tributary (VT) mapping according to Telcordia GR-253 standards. Table 4-19
shows the VT numbering scheme for the ONS 15454 as it relates to the Telcordia standard.
1
2
.
.
.
.
25
Input Ports
Output Ports
4X
STS-192
8X
STS-48
8X
STS-48
4X
STS-192
XC10G STS-1 Cross-connect ASIC (1152x1152 STS-1)
VT 1.5 Cross-connect ASIC
336 bidirectional VT 1.5 cross-connects
55386
1
2
.
.
.
.
25
VTXC
VT cross-connection occurs on the 25th port.
Table 4-19 ONS 15454 VT Mapping
ONS 15454 VT Number Telcordia Group/VT Number
VT1 Group1/VT1
VT2 Group2/VT1
VT3 Group3/VT1
VT4 Group4/VT1
VT5 Group5/VT1
VT6 Group6/VT1
VT7 Group7/VT1
VT8 Group1/VT2
VT9 Group2/VT2
VT10 Group3/VT2
VT11 Group4/VT2
VT12 Group5/VT2
VT13 Group6/VT2
VT14 Group7/VT2
VT15 Group1/VT3
VT16 Group2/VT3