Figure 2 - imacs architecture – Zhone Technologies IMACS Network Device User Manual

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Zhone Technologies, Inc.

IMACS Product Book, Version 4

March 2001

Page 4


















Figure 2 - IMACS Architecture


User Buses

The User buses are essentially a group of four Time Division Multiplexing (TDM) highways, each 2.048 Mbps in
capacity, and named A, B, C, and D. They are utilized by the User cards to format their traffic for further processing
either by Server or WAN cards. User cards are intended to provide physical interfaces to data or voice equipment
that either resides on site or is remotely connected over low speed analog or digital facilities. Server cards may
interface with these buses directly; whereas a cross-connect or bus connect CPU is required to interface the user
buses to WAN cards.

IMACS Voice cards are designed to use the A and B buses only. When there are voice cards installed, the CPU
allocates bandwidth on the A or B buses to these modules first. It then may utilize the remaining A and B bus
bandwidth for any other User cards inserted into the shelf. Most Data Cards can be configured to use all 4 user
buses.

WAN Buses

The WAN buses are a group of eight Time Division Multiplexing (TDM) highways, each 2.048 Mbps in capacity,
and named W1-1, W1-2, W2-1, W2-2, W3-1, W3-2, W4-1 and W4-2, respectively. They are utilized by the WAN
cards to format their traffic for transmission to high-speed digital facilities via the physical connector on the
Interface card. A WAN link is typically a T1, CEPT-E1, DSX-1 or HDSL facility connection. There are four WAN
card slots in an IMACS chassis. Each WAN card slot has 8 leads connected to the Interface card, which can be used
to support a T1/E1 facility. The fourth WAN slot has all the WAN connections from the other 3 slots in addition to
its own. These connections all terminate on the fourth WAN slot to support the WAN redundancy feature. The
WAN in the fourth slot can substitute for one of the other WAN cards by connecting the redundant WAN card to the
facility leads of the failed WAN card.

I/O X CONNECT

ISDN PRI

SERVER FUNCTIONS

FRAME RELAY

VOICE COMP

MANAGEMENT
COMMUNICATION

ATM

EXTERNAL ALARMS

NODE

MANAGEMENT

MODEM

TELNET

VT100

RITS

C

FXO

FXS

SUB-RATE

E&M

n x 56/64

FRAD

OCU-DP

DSO-DP

G.703

‘S/T’ INTERFACE

‘U’ INTERFACE

WAN CONNECTIVITY

BRIDGING

IP/IPX ROUTING

T1

DSX

CSU

HDSL

E1

G.703 CEPT

HDSL

NETWORK

MANAGEMENT

SNMP

AGENT

DIGITAL

ACCESS

VOICE

DATA

ISDN

BRI

LAN

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