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Cisco ONS 15454 Reference Manual, R8.5.x
78-18106-01
Chapter 2 Common Control Cards
2.6.1 XC-VXC-10G Functionality
At the STS level (high-order cross-connect), the XC-VXC-10G is always non-blocking (any STS-1 from
the system can be cross-connected to any other STS-1 without limitation up to 1152 bidirectional STS-1
ports (576 STS-1 cross-connects).
In addition, for “mixed” VT1.5 and VT2 grooming, 50% of the available VT resources (ports) are
allocated to each VT circuit type. The following three modes are supported (only one mode is available
at a time):
• Mode 1: full VT1.5 cross-connect, which is 2688 bidirectional VT1.5 ports (1344 bidirectional
VT1.5 cross-connects)
• Mode 2: full VT2 cross-connect, which is 2016 bidirectional VT2 ports (1008 bidirectional VT2
cross-connects)
• Mode 3 (mixed grooming): 50% VT1.5 and 50% VT2 XC, which is 1344 bidirectional VT1. 5 ports
and 1008 bidirectional VT2 ports (672 bidirectional VT1 .5 and 504 VT2 bidirectional
cross-connects)
The XC-VXC-10G card provides:
• 1152 STS bidirectional ports
• 576 STS bidirectional cross-connects
• 2688 VT1.5 ports via 96 logical STS ports
• 1344 VT1.5 bidirectional cross-connects
• 2016 VT2 ports via 96 logical STS ports
• 1008 VT2 bidirectional cross-connects
• Mixed grooming (50% VT1.5 and 50% VT2)
• Nonblocking at the STS level
• VT1.5, VT2, and STS-1/3c/6c/12c/48c/192c cross-connects
Note VT 2 circuit provisioning works between optical cards and the D S3/EC1-48 card (EC1 ports, not the
ports provisioned for DS3)
The XC-VXC-10G supports errorless side switches (switching from one XC-VXC-10G on one side of
the shelf to the other XC-VXC-10G on the other side of the shelf) when the switch is initiated through
software and the shelf is equipped with TCC2/TCC2P cards. The XCVT and XC10G cards do not
support errorless switching.
Cross-connect and provisioning information is established through the user interface on the
TCC2/TCC2P card. In turn, the TCC2/TCC2P card establishes the proper internal cross-connect
information and relays the setup information to the XC-VXC-10G card so that the proper
cross-connection is established within the system.
The XC-VXC-10G card is deployed in Slots 8 or 10. Upgrading a system to an XC-VXC-10G from an
earlier cross-connect module type is performed in-service, with hitless operation (less than 50-ms impact
to any traffic). The XC-VXC-10G can be used with either the standard ANSI shelf assembly
(15454-SA-ANSI) or high-density shelf assembly (15454-SA-HD).
Caution Do not operate the ONS 15454 with only one XC-VXC-10G cross-connect card. Two cross-connect
cards must always be installed.
Figure 2-8 shows the XC-VXC-10G cross-connect matrix.