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Features at a Glance

• RFC 1483 support for multiple encapsulations over ATM

• RFC 1577 support for routing over ATM

• ATM service classes: UBR, UBR+, VBR-rt, VBR-nrt, ABR,

and CBR (data only)

• ATM Forum UNI 3.0, UNI 3.1, and UNI 4.0

• AAL5 ATM adaptation layer

• Up to 1024 simultaneous Virtual Circuits (VCs)

• Layer 2 per-VC queuing and traffic shaping

• ATM PVCs and SVCs

• Permanent Virtual Paths (PVPs) (up to three)

• LANE 2.0 client and server

• F4 and F5 Operations and Maintenance (OAM) cell support

• ABR SVCs

• MPOA client and server

• Tag Switching (MPLS when approved)

• IETF PPP over ATM

• Next Hop Resolution Protocol (NHRP)

• ATM bandwidth (resource) manager

• Interim Local Management Interface (ILMI)

• ATM UNI 4.0 traffic management

• Frame User to Network Interface (FUNI)

ATM OC-3 Network Module Features and Benefits

The ATM OC-3 network modules provides robust ATM QoS

capabilities of Layer 2 per-VC queuing, bandwidth

management, and robust ATM service categories such as

UBR+, VBR-rt, VBR-nrt, and ABR. With these new ATM

service categories, users have more flexible access to network

resources and can achieve a compromise between

performance and cost. Additionally, network operators are

able to share network resources among different customers

and fulfill their needs in a cost-effective manner. Users can

now better optimize the application requirements as

compared to the network capabilities and can select a specific

combination of traffic and performance parameters.

The ATM OC-3 network modules are ideal for

connecting directly to ATM Wide Area Network (WAN) at

large, remote, branch office sites to a central site via a public

or privately owned ATM WAN or for connections to a

colocated Cisco ATM switch to provide integrated Circuit

Emulation Service (CES) data, voice, and video support.

Voice over IP (VoIP) over ATM applications is supported

using the currently available voice/fax network modules and

associated voice interface cards. Support is also provided for

other advanced ATM Layer 2 features such as Internet

Engineering Task Force (IETF) Point-to-Point Protocol (PPP)

over ATM, Tag Switching, multiprotocol over ATM

(MPOA), and multilayer switching (MLS) enhancing ATM

performance for enterprise and service providers.

These ATM network modules also allow the Cisco 3600

series modular access routers to provide advanced Cisco

IOS

features, such as Committed Access Rate (CAR), RSVP,

Cisco Express Forwarding (CEF), and Cisco IOS Firewall

Feature Set to provide the customer with end-to-end QoS.

The benefits of a high-speed ATM connection from

branch office to a regional or corporate headquarters include

the transfer of high-speed data and support for new

multimedia applications including voice, video, and

distance-learning applications. Using an ATM transport

allows for application-specific QoS to be used, especially

important for the next generation of delay-sensitive

multimedia traffic. The integration of VoIP over ATM and

data applications over ATM is ideal for delivering low

latency, jitter-free voice support due to ATM’s support for

high transmission speeds, prioritization techniques, and

built-in QoS features.

The combination of Layer 2 and Layer 3 QoS features

with the Cisco 3600 series ATM OC-3 network modules

allows service providers to effectively manage the bandwidth

at the edges of the network while implementing value-added

Layer 3 services. With advanced traffic-shaping features and

support for many ATM service classes (including VBR-rt,

VBR-nrt, and ABR), the ATM OC-3 network modules can be

effectively deployed as ATM edge router devices in the

service provider network.

The Cisco 3600 series with OC-3 ATM network

modules can be used by service providers in a Tag Switching

environment. Tag Switching enables routers at the edge of a

network to apply simple tags to packets, while devices in the

core of the network switch packets according to these tags.

Switches, such as ATM switches, or existing routers, can

perform Tag Switching in the core. These systems will run

Tag Switching software, which communicates with tag

routers on the edge using a Tag Distribution Protocol. For

multiservice networks, Tag Switching enables a Cisco 3600

to provide ATM, Frame Relay, and IP Internet service all on

a single platform in a highly scalable way. Supporting all of

these services on a common platform provides operational

cost savings and deployment ease to multiservice providers.