20 Channelized T1 Port Adapter Installation and Configuration
VIP2 and the 2CT1 Port Adapter
Interface ports on the 2CT1 port adapter maintain the same address regardless of whether other
interface processors are installed or removed. However, when you move a VIP2 to a different slot,
the first number in the address changes to reflect the new slot number.
Figure 14 shows some of the port adapter slots and interface ports of a sample Cisco 7505 system.
For example, on the 2CT1-equipped VIP2 in chassis slot 3, the addresses for the interface ports are
3/1/0 through 3/1/1 (chassis slot 3, port adapter slot 1, and interface ports 0 through 1). If the port
adapter was in port adapter slot 0, these same interface ports would be numbered 3/0/0 through 3/0/1.
The first port adapter slot number is always 0; the second port adapter slot number is always 1. The
individual interface port numbers always begin with 0. The number of additional ports depends on
the number of ports on a port adapter. Port adapters can occupy either port adapter slot; there are no
restrictions.
Note
If you remove the 2CT1-equipped VIP2 (shown in Figure 14) from chassis slot 3 and install
it in chassis slot 2, the addresses of those same ports become 2/1/0 through 2/1/1.
Figure 14
Serial Interface Port Number Example (Cisco 7505 Shown)
You can identify interface ports by physically checking the slot/port-adapter/interface port location
on the back of the router or by using show commands to display information about a specific
interface or all interfaces in the router.
Shutting Down an Interface
Before you replace an interface cable, replace port adapters, or remove an interface that you will not
replace, use the shutdown command to shut down (disable) the interfaces. Doing so prevents
anomalies from occurring when you reinstall the new or reconfigured VIP2. You can shut down all
24 interfaces of a controller by specifying the controller before issuing the shutdown command. You
can shut down individual interfaces of a controller by specifying the channel group or PRI group
assigned to each controller (channel groups and PRI groups are treated as serial interfaces by the
system). When you shut down an interface, it is designated administratively down in the show
command displays.
H8671
Slot 0
Slot 1
Slot 2
Slot 3
Interface
processor
slots
EJECT
SLOT 0
SLOT 1
NORMAL
CPU HALT RESET
CONSOLE
2CT1 port adapter
(port numbers 3/1/0 and 3/1/1,
from left to right)
0
1
2
3
LINK
0
1
2
3
ETHERNET 10BT
EN
LB
LA
RA
LB
0
1
LA
RA
