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11-14
Cisco ONS 15454 Reference Manual, R7.0
78-17191-01
Chapter 11 Circuits and Tunnels
11.3 11.3 Cross-Connect Card Bandwidth
Figure 11-4 Two VT1.5 Circuits in a BLSR
Note Circuits with DS1-14 and DS1N-14 circuit sources or destinations use one STS port on the VT matrix.
Because you can only create 14 VT1.5 circuits from the DS-1 cards, 14 VT1.5s are unused on the VT
matrix.
VT matrix capacity is also affected by SONET protection topology and node position within the circuit
path. Matrix usage is slightly higher for path protection nodes than BLSR and 1+1 nodes. Circuits use
two VT matrix ports at pass-through nodes if VT tunnels and aggregation points are not used. If the
circuit is routed on a VT tunnel or an aggregation point, no VT matrix resources are used. Table 11-5
shows basic STS port usage rates for VT 1.5 circuits.
STS Matrix
XCVT/XC10G Matrices
VT1.5 circuit #1 on STS-1
1 VT1.5 used on STS-1
27 VT1.5s available on STS-1
VT1.5 circuit #2 on STS-2
1 VT1.5 used on STS-2
27 VT1.5s available on STS-2
EC-1
4 STSs total used
20 STSs available
Drop
Source
134345
STS Matrix
XC-VXC-10G Matrices
VT1.5 circuit #1 on STS-1
1 VT1.5 used on STS-1
27 VT1.5s available on STS-1
VT1.5 circuit #2 on STS-2
1 VT1.5 used on STS-2
27 VT1.5s available on STS-2
EC-1
4 STSs total used
92 STSs available
STS
VT1.5
Drop
Source
VT1.5 Matrix
VT1.5 Matrix
OC-192
OC-12