Cisco 2600 Series Operation Manual page 60

Asynchronous Network Modules Interface Numbering
Cisco 2600 Series Asynchronous Port Interface Numbering
Interface numbering for Cisco 2600 series routers differs from Cisco 3600 series interface
numbering in the following ways:
•
WAN interface card slot numbers always appear as slot 0, even if the interface card is
installed in the slot labeled W1.
•
WAN interface cards are numbered dynamically, starting with the first card installed.
For example,
— If slot W0 is empty and slot W1 contains a 1-port serial WAN interface card, the
— If slot W0 contains a 2-port serial WAN interface card and slot W1 contains a 1-port
4-Port and 8-Port Interface Numbering
Existing 4-port and 8-port asynchronous/synchronous network modules, when configured
for asynchronous operation under Cisco IOS releases prior to 11.2(7)P, use a different
interface numbering algorithm:
interface-number = (16 x slot-number) + unit-number + 1
Table 6-4 shows the numbers available under this numbering scheme. These interface
numbers create potential conflicts with the numbers assigned to 16-port and 32-port
asynchronous modules: it would be possible for a 16-port or 32-port asynchronous module
in one slot to overlap the interface numbers of a 4-port or 8-port asynchronous/synchronous
module in another slot.
Table 6-4
Slot Number Interface Numbers
0
1
6-8 Cisco Network Modules Hardware Installation Guide
interface number would be serial 0/0.
serial interface card, serial 0/0 and 0/1 would reside in slot W0 and serial 0/2 would
reside in slot W1.
4-Port and 8-Port Asynchronous Network Module Interface
Numbering
(4-Port Module)
1–4
17–20
Interface Numbers
(8-Port Module)
1–8
17–24