11-13
Cisco ONS 15454 Reference Manual, R8.5.x
78-18106-01
Chapter 11 Circuits and Tunnels
11.3 Cross-Connect Card Bandwidth
For example, if you create a VT1.5 circuit from an STS-1 on a drop card, two VT matrix STS ports are
used, as shown in Figure 11-3. If you create a second VT1.5 circuit from the same STS port on the drop
card, no additional logical STS ports are used on the VT matrix. In fact, you can cre ate up to 28 VT1.5
circuits using the same STS-1 port. However, if the next VT1.5 circuit originates on a different STS, an
additional pair of STS ports on the VT matrix is used, as shown in Figure 11-4. If you continued to create
VT1.5 circuits on different EC-1 STSs and mapped each to an unused outbound STS, the VT matrix
capacity would be reached after you created 12 VT1.5 circuits in the case of the XCVT or XC10G cards,
or 48 VT1.5 circuits in the case of the XC-VXC- 10G card.
Figure 11-3 One VT1.5 Circuit on One STS
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
EC-1
Drop
2 STSs total used
22 STSs available
VT1.5 Matrix
Source
134344
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
EC-1
Drop
2 STSs total used
94 STSs available
STS
VT1.5
VT1.5 Matrix
Source
OC-12
OC-192