CTI Products EXB-232 Asynchronous Serial System Extender - Manual (Page 9)

68-11089-115
5
COM 2
COM 1
PORT 1 PORT 1
SERIAL SERIAL
CA-80304-100
PORT 1
SERIAL
PORT 2
CIB
HIB
T
IN
OUT
OUT
T
CIB
OUT
T
LOCAL PC
T1
MUX
T1
MUX
T1
MUX
T1
MUX
CIB
OUT
IN
CIB
OUT
IN
IN
COMPARATORS
1
2
3
EXB IN
OUT IN
OUT
T T
EXB
CIB
OUT
IN
CIB
OUT
IN
IN
COMPARATORS
1
2
3
IN
OUT
T
EXB
P/S
P/S
P/S
P/S
P/S
Figure 4 - Two Port EXB-Serial Module System Example
The system in Figure 4 shows how a single EXB-Serial module is connected to two remote
networks. The EXB-Serial module at the PC side of the network has both PORT 1 and PORT 2
connected to high speed fractional T1 circuits to allow simultaneous monitoring of two remote
comparator sites. Both PORT 1 and PORT 2 of this EXB-Serial module are configured to match
the baud rate of the T1 MUXes. The EXB-Serial modules at the comparator sites are both
configured with PORT 2 disabled and PORT 1’s baud rate matching the baud rate of the T1
MUXes.
NOTE: The EXB-Serial module is configured as a DTE device. In order to use standard RS-232
cables to connect the module with the RS-232 communication channel (in this case, the T1
MUX), the RS-232 communication channel must be configured as a DCE device.
EXB-Serial devices can operate with external modems. If dial-up operation is required, the
modems must be capable of being manually dialed.