Specifications

4-20
Cisco ONS 15454 Troubleshooting and Maintenance Guide
November 2001
Chapter 4 Card Reference
XC Cross-Connect Card
4.7 XC Cross-Connect Card
The cross-connect card is the central element for ONS 15454 switching. Available cross-connects are
the XC, XCVT, and XC10G. The XC establishes connections and performs time division switching
(TDS) at the STS-1 level between ONS 15454 traffic cards. The XC card faceplate and block diagram
are shown in Figure 4-5. The cross-connect matrix is shown in Figure 4-6 on page 4-21.
Figure 4-5 XC card faceplate and block diagram
The switch matrix on the XC card consists of 288 bidirectional ports. When creating bidirectional STS-1
cross-connects, each cross-connect uses two STS-1 ports. This results in 144 bidirectional STS-1
cross-connects. The switch matrix is fully crosspoint, non-blocking, and broadcast supporting. (Any
STS-1 on any port can be connected to any other port, meaning that the STS cross-connections are non
blocking.) This allows network operators to concentrate or groom low-speed traffic from line cards onto
high-speed transport spans and to drop low-speed traffic from transport spans onto line cards.
Line 1
Line 2
Line 3
Line 4
Span 1
Span 2
Span 3
Span 4
Line 5
Line 6
Line 7
Line 8
Cross-Connect
Main SCL
Protect
SCL
Ref Clk A
Ref Clk B
TCCA
ASIC
SCL Link
uP
uP Interface
uP Interface
Matrix
FLASH
RAM
B
a
c
k
p
l
a
n
e
61340
XC
FAIL
33678 12931
ACT/STBY