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Cisco AS5400 Architecture

The Cisco AS5400 provides all the system components that

SPs have come to expect from carrier-class products as well

as all the routing, WAN, and QoS features that are the

hallmark of Cisco routing products. The main CPU in the

Cisco AS5400 is the QED RM7000. This is the same

high-performance processor used in the Cisco 7206 VXR

series router platforms. A Cisco dial feature card (DFC)

contains DSPs, trunk interfaces, or any other functionality

required on an access server. The Cisco AS5400 architecture

uses distributed processing between the DFCs and the

motherboard to optimize the processing path for

unparalleled performance.

Egress Interfaces

The Cisco AS5400 provides three redundant WAN backhaul

methods for moving packets out to the network:

• Two Fast Ethernet (FE) ports

• Two 8-MB serial ports

• Multiple T1, E1, or CT3 DS1 trunks

Ingress Interfaces

The Cisco AS5400 accepts and consolidates all types of

remote trafﬁc, including dial-in analog, digital ISDN, and

wireless Global System for Mobile Communication (GSM)

V.110 calls. The Cisco AS5400 currently supports two

ingress types:

• Channelized T3 termination

• Eight-port CT1/CE1/PRI termination

Cisco AS5400 CT3 Termination Card

Cisco provides the CT3 card for high-density PSTN

connectivity. Thiscard provides amaximum of 672channels

via a single CT3 connection. This card is valuable to any

customer who wishes to reduce the amount of cables

requiredto deliver672channels and takeadvantage of lower

tariffs associated with purchasing a single CT3 circuit versus

28 individual T1 circuits. The CT3 card provides a

standards-based M13 multiplexer in conjunction with

resources to terminate up to 28 T1s.

Conﬁguration of any T1 interface contained within the

CT3 interface can be provisioned independently of other

CT1 interfaces included within the same CT3 facility. Users

can conﬁgure the CT3 card to carry ISDN PRI trunks (each

connected to a different switch type), and a variety of

North American robbed-bit signaling (RBS) types such as

“loop-start” and “ground-start,” all on the same Cisco

AS5400 platform. Conﬁguring the CT3 interface and

accompanying PRI/T1 trunks can be performed using the

standard Cisco IOS Command-Line Interface (CLI).

The CT3 card can be used for both ingress and egress at

the same time. An example conﬁguration would be to use

22 T1 circuits for inbound trafﬁc and 6 T1s for outbound

backhaul. This would allow the Cisco AS5400 to provide a

large density of modems in a remote Point of Presence (POP)

environment, with only a power cable and a CT3 line

running to the server.

Following is a briefdescription of the CT3 interfacetype and

PRI/T1 trunk types supported:

• T3 (44.736 Mbps) links default to binary 3 zero

substitution (B3ZS) line encoding and C-bit framing.

Physical connection to a T3 circuit is provided on two

standard 75-ohm, unbalanced, female BNC connectors.

• T1/PRI (1.544 Mbps) links are supported as described in

the following section on the 8-Port E1/T1 card. E&M,

loop-start, and ground-start links are all supported.

• Universal access (analog modem or digital calls) is

supported when an individual 1.544-Mbps interface

contained within the CT3 circuit is conﬁgured for ISDN

PRI signaling. PRI signaling isavailable on all 1.544-Mbps

trunks. Up to a maximum of 248 individual B channels

total may be terminated per CT3 card.

• Nonintrusive monitoring of individual T1/PRI signals is

available at the front of the CT3 card via standard

100-ohm bantam jacks.

Figure 2 CT3 Termination Card

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