IBM 3174 - Page 181

Modem Specifications and Setup
Table
B-2. IBM 5853 Modem Switch Settings
Switch
Numbei
Option
Name
Switch
Setting
Description
1
Error Checking Link
(ECL) Failure Activity
On
If the modem fails to establish an error-checking link, the
error-checking iink is terminated, or if the inactivity timer
times out, the modem changes to a non-ECL connection.
Use with the ECL front panel switch.
2
Reset to Default
Options on Loss of
Data Terminal Ready
(DTR)
On
Modem configuration changes are saved and not reset
when DTR turns off.
3
Modem-to-Modem
Flow Control
ON
The modems send XON and XOFF characters to control
data flow between themselves. This switch is ignored if
ECL is active.
4
Speed Buffering
On
The modem's AEA interface speed is the same as the
modem's telephone line speed.
5
Modem-to-AEA Flow
Control
On
The modem uses XON and XOFF characters when it
wants the AEA to stop sending data.
6
Receive Line Signal
Detect (RLSD)
On
The modem turns on RLSD when it detects carrier from
the remote modem.
7
Ready For Sending
(RFS)
On
The modem turns on RFS in response to RTS turning on.
8
Data Set Ready (DSR)
On
The modem turns on DSR to signal the AEA that a
connection is established.
B-4 3174 Establishment Controller Terminal User's Reference for Expanded Functions