CTI Products EXB-IP Ethernet System Extender - Manual (Page 8)

CTI Products, Inc. EXB-IP User Guide
Introduction 8
B LOCK D IAGRAM
As shown in Figure 2, there are three sources of message packets within the EXB module. The first source is
the MCN NETWORK connector on the front of the module. The second is the 10BaseT Ethernet media
connector on the rear of the module. The third source is the Control Neuron Processor. Message packets
originating from any of these sources are sent to the other two.
MCN
NETWORK
Side
A
MCN ROUTER
MCN
TRANSCEIVER
78K or 1250
“DC IN”
Connector
“NETWORK”
Connector
“10BaseT”
Connector
Side
B
RS-232 Serial
Port
(Configuration)
POWER
SUPPLY
CPU
To
Ethernet
Channel
ASYNC
Port
Figure 2 EXB Network Extender Module Block Diagram
• The “NETWORK” connector attaches to the local MCN network using a compatible transceiver internal to
the EXB module and is associated with Side B of the internal router.
• One of the Ethernet connectors attaches to the Ethernet channel, providing communication to additional
EXB modules at remote sites. These ports are associated with Side A of the internal router.
• The CPU controls the overall operation of the module.
MCN Router Function
The internal MCN router in each EXB module may be configured as a repeater, or custom-configured router.
The easiest configuration is as a repeater, where all messages which enter the EXB module on the MCN
Network or the Ethernet (Or fiber) port are passed to the other port. EXB modules normally ship with the
router set up as a repeater unless the system is a Custom Configured system with a Custom Configuration
documentation package (KA-8xxxx-xxx)
If the module is part of a Custom Configured system, there will be a special configuration for each EXB in the
system. Typically this is used when there are multiple 78K networks feeding into a 1250 network. The internal
routers will be configured to pass the MCN status traffic "upstream" to the PCs on the 1250 network, but not
back to the other 78K networks.
Central Processor (CPU)
The CPU controls the overall module. Ethernet channel parameters can be configured and displayed via the
serial port using the EXB Config program.
Ethernet Connector
The 10BaseT connector implements IEEE standard Ethernet at 10 Mbps.