Руководство По Устранению Ошибки для Cisco Cisco 3600 Series 8-Port Asynchronous Synchronous Serial NM

For more information on document conventions, refer to the Cisco Technical Tips Conventions.

This section explains what the product numbers stand for.

NM−4A/SFour Port Async/Sync Network Module

• 

NM−8A/SEight Port Async/Sync Network Module

• 

Here are the features of the 4−port (NM−4A/S) and 8−port (NM−8A/S) asynchronous/synchronous
(async/sync) network module:

It has four or eight async/sync ports.

• 

It uses Cisco 60−pin "5−in−1" connectors (same as Cisco 2500 and Cisco 7000).

• 

It uses the same cabling as Cisco 2500 and Cisco 7000.

• 

The maximum speed is 115.2 kbps for async, 128 kbps for the sync external clock, and 125 kbps for
the internal clock.

• 

This table lists the platforms supported:

NM−4A/S

all Cisco
IOS
versions

all Cisco
IOS
versions

all Cisco
IOS
versions

all Cisco
IOS
versions

all Cisco
IOS
versions

NM−8A/S

all Cisco
IOS
versions

all Cisco
IOS
versions

all Cisco
IOS
versions

all Cisco
IOS
versions

all Cisco
IOS
versions

Note: The Cisco IOS software releases provided are typically the minimum version required to support the
platform, module, or feature in question. Use the Software Advisor (registered customers only) to choose
appropriate software for your network device, match software features to Cisco IOS and CatOS releases,
compare IOS releases, or find out which software releases support your hardware.

On the 4− and 8−port async/sync network modules, the interfaces are addressed as interface serial
<slot>/<unit>. The units are numbered from right to left, and bottom to top.

The default setting for these modules is synchronous. To configure the modules for async communication use
the physical−layer async command. Here is a section of an async configuration: