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ARCHITECTURE
3-2
3.3 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 tech-
nology 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)
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 19200 baud Sync-escape protocol bus that
passes the CSB data to the Call Processor or external
peripheral equipment via the NetNIM.
• 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 1200 baud sync-escape protocol bus that
passes control and status between SNMs.
• PSTN or PABX
Connects to a PSTN (Public Switch Telephone
Network) or a PABX (Private Automatic Branch
Exchange) for outgoing and incoming telephone calls.
Figure 3-2 DATA BUSES
CIMs CCMs
(NetIDB)
DATA BUS
INTRA-TERMINAL
NETWORK
(NetCSB)
STATUS BUS
CHANNEL
NETWORK
NETWORK
INTERFACE
MODULE
NetNIM
(CIB)
CHANNEL INTERFACE BUS
CONVENTIONAL
CHANNEL
MODULE
INTERFACE
CHANNEL
MODULE
INTRA-TERMINAL DATA BUS (IDB)
(CIB)
CHANNEL INTERFACE BUS
CHANNEL STATUS BUS (CSB)
DISPATCH
MODULE
CHANNEL
DCMs
PSTN OR PABX
TELEPHONE
MODULE
INTERFACE
TIMs
NETWORK
SYSTEM
MODULE
SNMs
SYSTEM NETWORK BUS (SNB)
CALL
PROCESSOR
WIDE
MODULE
AREA
WAMs
LOGGING
MODULE
ENCODER
LEMs
LOGGING RECORDER
ETHERNET
BUS
DISPATCH INTERFACE BUS
(DIB)
DIMs
DISPATCH
MODULE
INTERFACE
SYSTEM
AND
SUBSCRIBER
MANAGER