Specifications

4-24
Cisco ONS 15454 Troubleshooting and Maintenance Guide
November 2001
Chapter 4 Card Reference
XCVT Cross-Connect Card
Caution Do not operate the ONS 15454 with a single TCC+ card or a single XCVT/XC10G/XC card installed.
Always operate the shelf with one working card and one protect card. Duplex cards must be the same
type.
Figure 4-8 XCVT cross-connect matrix
4.8.1 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 4-17
shows the VT numbering scheme for the ONS 15454 as it relates to the Telcordia standard.
32125
1
2
3
4
5
Input Ports
Output Ports
4X
STS-12/48
8X
STS-12
8X
STS-12
4X
STS-12/48
XCVT STS-1 Cross-connect ASIC (288x288 STS-1)
VT 1.5 Cross-connect ASIC
1
2
3
4
5
6
VTXC
336 bidirectional VT 1.5 cross-connects
Table 4-17 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