EFJohnson 3000 SERIES Figure, DATA BUSES, 3.3 BUS STRUCTURE

ARCHITECTURE

INTRA-TERMINAL DATA BUS (IDB)

CHANNEL INTERFACE BUS

CHANNEL INTERFACE BUS

DISPATCH INTERFACE BUS

LOGGING RECORDER

PSTN OR PABX

NETWORK

(CIB)

(CIB)

(DIB)

INTRA-TERMINAL

DATA BUS

CALL

(NetIDB)

NetNIM

PROCESSOR

NETWORK

DISPATCH

LOGGING

TELEPHONE

NETWORK

INTERFACE

CHANNEL

CONVENTIONAL

INTERFACE

ENCODER

INTERFACE

MODULE

INTERFACE

CHANNEL

MODULE

MODULE

MODULE

CHANNEL

MODULE

MODULE

DIMs

STATUS BUS

CIMs

CCMs

LEMs

TIMs

(NetCSB)

DISPATCH

CHANNEL

MODULE

SYSTEM

DCMs

AND

SUBSCRIBER

MANAGER

SYSTEM

WIDE

NETWORK

MODULE

AREA

MODULE

SNMs

WAMs

ETHERNET

BUS

CHANNEL STATUS BUS (CSB)

SYSTEM NETWORK BUS (SNB)

Figure 3-23.3 BUS STRUCTURE

The modules in the system are connected by various busses as described in the following sections.

3.3.1 DATA BUS

•Ethernet Bus

The Ethernet Bus is a broadcast networking technology that can use several different physical media, including twisted-pair cable and coaxial cable. The Ethernet bus connects multiple Call Processors and the System and Subscriber Manager together using TCP/IP for communication. This allows the Call Processors and the System and Subscriber Manager to pass information to keep each other up to date. The bus passes data for Subscriber Management, Subscriber Registration, and Switch Configuration Management.

•Network Intra-Terminal Data Bus (NetIDB)

DATA BUSES

•Intra-Terminal Data Bus (IDB)

A 19200 baud sync-escape protocol bus that modules communicate on to pass control information to each other using high speed CSMA.

•Channel Status Bus (CSB)

A 19200 baud sync-escape protocol bus that passes channel status from channel modules to other system modules using high speed Carrier Sense Multiple Access (CSMA).

•Channel Interface Bus (CIB)

A 1200 baud sync-escape protocol bus that

passes system channel control and status to and from the CIM.

•System Network Bus (SNB)

A 19200 baud sync-escape protocol bus that passed information from the Call Processor to and from other modules via the NetNIM.

•Network Channel Status Bus (NetCSB)

A 1200 baud sync-escape protocol bus that passes control and status between SNMs.

•PSTN or PABX

A19200 baud Sync-escape protocol bus that passes the CSB data to the Call Processor or external peripheral equipment via the NetNIM.

Connects to a PSTN (Public Switch Telephone Network) or a PABX (Private Automatic Branch Exchange) for outgoing and incoming telephone calls.

3-2