Zhone Technologies Network Device manual User Buses, WAN Buses

Zhone Technologies, Inc. IMACS Product Book, Version 4

NETWORK

MANAGEMENT

SNMP AGENT

NODE

MANAGEMENT

MODEM

TELNET

DSX

CSU

HDSL

T1

WAN CONNECTIVITY

G.703 CEPT

HDSL

SERVER FUNCTIONS

E1

ISDN PRI

FRAME RELAY

VT100

RITS

EXTERNAL ALARMS

	I/O X CONNECT	VOICE COMP
		MANAGEMENT
		COMMUNICATION
C
		ATM

VOICE

FXO

FXS

E&M

DATA		LAN		DIGITAL
				ACCESS
					OCU-DP
	SUB-RATE		IP/IPX ROUTING
	n x 56/64				DSO-DP
	FRAD		BRIDGING		G.703

ISDN

BRI

‘U’ INTERFACE

‘S/T’ INTERFACE

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.

March 2001 Page 4