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Cisco 2691, 3600 Series, and 3700 Series ATM OC-3 155-Mbps
Network Modules

C

ISCO

S

YSTEMS EXTENDS

WAN

CONNECTIVITY BY ADDING HIGH

-

SPEED

ATM

ACCESS TO REMOTE BRANCH OFFICES WITH THE

C

ISCO

2691,

3600,

AND

3700

SERIES

ATM OC-3

NETWORK MODULES

.

Three 155-Mbps ATM OC-3 network modules are available on the Cisco 3620 and 3640

starting with Cisco IOS® Release 12.0(3)T. They are also now available on the Cisco 2691

and Cisco 3725 in starting in IOS release 12.2(13)T. These three network modules support

STS-3c and STM-1 framing standards over multimode, single-mode intermediate-reach, and

single-mode long-reach fiber optic interfaces. All three versions consist of a single-port

network module with SC type connectors. The single-mode ATM network modules provide

high-speed trunking for users with access to fiber WAN, while multimode is ideal for

connecting high-speed servers, switches, or hubs equipped with and OC-3/STM-1 fiber

connections.

All three versions support the ATM Forum standard ATM adaptation Layer 5 (AAL5) with

ATM QoS categories Unspecified Bit Rate (UBR), UBR+, Variable Bit Rate (VBR)-rt,

VBR-nrt, Available Bit Rate (ABR), and Constant Bit Rate (CBR) traffic classes support

supported. Voice over IP (VoIP) and H.323 over ATM can be supported over the WAN using

the currently available analog voice/fax network modules, and voice interface cards.

Three new Enhanced Performance (EP) ATM OC-3 network modules are released on Cisco

3745 to support the higher performance and better throughput. The ATM OC-3 EP network

modules are identical to the Non-EP version in terms of features supported and physical

specifications.

The ATM OC-3 network modules are supported on the Cisco 2691, 3620, 3640, 3660, and

3725 routers and the Enhanced Performance ATM OC-3 network modules are supported on

Cisco 3745 router only. (Cisco 3745 does not support Non-EP ATM OC-3 network

modules.) Cisco IOS "Plus" feature sets are required to support ATM. A maximum of one

ATM OC-3 network module is recommended on Cisco 2691, 3600 Series and 3725. A

maximum of two ATM OC-3 EP network module is recommended on Cisco 3745.