Data Sheet

Data Sheet

Applications

The Cisco 1- and 2-Port Multichannel Enhanced Capability Port Adapters meet a variety of service

interconnection requirements, including concurrent support for leased line and Frame Relay.

Enterprises and service providers can connect the DS-3 ports of the adapters into these services

for aggregation of large numbers of remote-site and Internet service provider (ISP) customers into

a central site. These multichannel port adapters combine advanced services and capabilities such

as supporting MLPPP and MLFR bundling as well as performing LFI and FRF.12 fragmentation

directly on the port adapter, thereby offloading the processing of these features from the central

CPU of the router. With integrated DS-1 channel service unit/data service unit (CSU/DSU)

functions, the port adapters are compatible with the large number of standards-compliant DS-1

CSU/DSUs on the market. As with the existing packet-over-T3 cards, in clear-channel mode, each

DS-3 can be configured for full-rate or subrate operation that is compatible with a variety of third-

party DS-3 DSUs.

The port adapters combine superior performance and an innovative design to provide the following

benefits:

●

Deliver line-rate performance while lowering CPU usage

●

Perform all packet fragmentation and reassembly and resequencing for MLPPP and MLFR

bundles while supporting LFI and FRF.12

Key Features and Benefits

Table 1 describes the features and benefits of the new port adapters.

Table 1. Features and Benefits of Cisco 1- and 2-Port Multichannel Enhanced Capability Port Adapters

Features Benefits

Operation Modes

Multichannel (channelized) 28 T1 ports multiplexed onto a single T3 connection per interface

Clear channel (unchanelized) Offers an unchannelized 45-Mbps T3 clear channel per interface

Performance

Line rate Provides full T3 line usage and throughput

New intelligent software architecture Lower CPU usage increases router efficiency and improves resource usage, enabling

more services

Feature Offloads

MLPPP Port adapter intelligence alleviates heavy processing of CPU-intensive features

MLFR Lowers CPU processing while performing fragmentation and defragmentation

LFI Reduces delay on slower-speed links by breaking up large datagrams and interleaving

low-delay traffic packets with the smaller packets resulting from the fragmented

datagram

FRF.12 Controls delay and delay variation when real-time traffic such as voice is carried across

the same interfaces as data

Performance constrained only by processing engine.

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