This section provides examples of naming interfaces. For an illustration of where slots, PICs, and ports are located, see Figure 4.
Figure 4: Interface Slot, PIC, and Port Locations

For an FPC in slot 1 with two OC3 SONET/SDH PICs in PIC positions 0 and 1, each PIC with two ports uses the following names:
- so-1/0/0.0
- so-1/0/1.0
- so-1/1/0.0
- so-1/1/1.0
An OC48 SONET/SDH FPC in slot 1 and in concatenated mode appears as a single FPC with a single PIC, which has a single port. If this interface has a single logical unit, it has the following name:
- so-1/0/0.0
An OC48 SONET/SDH FPC in slot 1 and in channelized mode has a number for each channel. For example:
- so-1/0/0:0
- so-1/0/0:1
For an FPC in slot 1 with a Channelized OC12 PIC in PIC position 2, the DS3 channels have the following names:
- t3-1/2/0:0
- t3-1/2/0:1
- t3-1/2/0:2
- ...
- t3-1/2/0:11
For an FPC in slot 1 with four OC12 ATM PICs (the FPC is fully populated), the four PICs, each with a single port and a single logical unit, have the following names:
- at-1/0/0.0
- at-1/1/0.0
- at-1/2/0.0
- at-1/3/0.0
In a routing matrix on the T640 routing node labeled lcc1, for an FPC in slot 5 with four SONET OC192 PICs, the four PICs, each with a single port and a single logical unit, have the following names:
- so-13/0/0.0
- so-13/1/0.0
- so-13/2/0.0
- so-13/3/0.0
For an FPC in slot 1 with one 4-port BRI interface card, port 4 has the following name:
- br-1/0/4
The first B channel, the second B channel, and the control channel have the following names:
- bc-1/0/4:1
- bc-1/0/4:2
- dc-1/0/4:0