Filter
Top Products
2-20
Cisco ONS 15454 Reference Manual, R7.0
78-17191-01
Chapter 2 Common Control Cards
2.5 2.5.2 VT Mapping
Caution Do not operate the ONS 15454 with only one XCVT or XC10G card. Two cross-connect cards of the
same type (either two XCVT or two XC10G cards) must always be installed.
Figure 2-6 shows the cross-connect matrix.
Figure 2-6 XC10G Cross-Connect Matrix
2.5.2 VT Mapping
The VT structure is designed to transport and switch payloads below the DS-3 rate. The ONS 15454
performs VT mapping according to Telcordia GR-253-CORE standards. Table 2-16 shows the VT
numbering scheme for the ONS 15454 as it relates to the Telcordia standard.
1
2
.
.
.
.
25
Input Ports
Output P
orts
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 2-16 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