Reliant Octel 200 and Octel 300 Message Servers PB6001401 - Manual (Page 136)

4-18 Installation and Maintenance Volume
Octel Overture 200/300 Serenade 3.0 PB60014–01
Table 4-5 Pinouts for External Modem Connections
Modem
Pin
Number
Octel Overture
200/300
Pin Number
Modem Signal
Name/Function
Octel Overture 200/300
Name/Function
2
3
5
4
7
8
20
3
2
4
5
7
20
8
Transmit data
Receive data
CTS
RTS
Signal ground
DCD
DTR
Receive data
Transmit data
RTS
CTS
Signal ground
DTR
DCD
Figure 4-7 Octel Overture 200/300 to External Modem Pinouts
НН
НН
НН
НН
2
3
4
5
7
8
20 2
3
4
5
7
8
20
НН
НН
НН
НН
RS-232C Male Connectors
To modem
(DCE) To Octel Overture 200/300
(DCE)
The Octel Overture 200/300 requires pin 4 (RTS) to be TRUE or left open and pin 20, Data Terminal
Ready (DTR), to be TRUE. The modem must provide DCD (pin 8) and CTS (pin 5) at the modem
connector; that is, DTR (pin 20) and RTS (pin 4) at the Octel Overture 200/300 connector.
Other considerations are as follows:
- The modem must drop DCD with the loss of carrier. If service is interrupted and the modem does not
drop DCD, subsequent callers can reestablish the connection without requiring a security code.
- Auto-answer must be enabled to allow technical support personnel to connect to the modem without
on-site intervention.
- Octel recommends forcing DTR high. This is required to maintain the connection with the message
server, if a restart or reload is required. If DTR is not forced high, the connection is lost when the
message server is restarted.
Cable the modem to either the front or rear system-terminal port. Test that the modem is correctly
configured. If you have a problem or question connecting your modem, call Octel technical support.