Installing and putting a SINAUT modem into operation
6.6 Analog dial-up modem MD3
SINAUT ST7 Station control system - System Manual
280
System Manual, 05/2007, C79000-G8976-C178-06
Table 6-32 Basic setting for dedicated line mode
Meaning
Setting on DIL switch
Data format 11 bits (8E1)
2))
21
Data format 10 bits (8N1)
2))
21
Modem A (originate)
2)
2))
21
Modem B (answer)
2)
2))
21
Line adjustment 600 ohms
1)
2))
21
Line adjustment Zr
1)
2))
21
The factory setting for the line adjustment is Zr because this normally adapts MD3 optimally to the dedicated line and the frequencies used.
Line adjustment with 600 ohms is not normally necessary. It is, however, important that the two modems connected to each other over the
dedicated line are set to the same line adjustment.
2) Refer to the explanations in the section Modem A and modem B for dedicated line mode.
Note
A further important basic setting for dedicated line mode is deactivating the loop power
section.
Modem A and modem B for dedicated line mode
When setting up a point-to-point link, remember that the two MD3 modems being used for
the connection must have different parameter settings. To simplify matters, the modems with
the difference settings are referred to as "modem A" and "modem B". "Modem A" (originate)
is the modem in the role of active modem that attempts to establish the connection to the
partner over the dedicated line. Modem B (answer) is the passive answering modem during
connection establishment.
During connection establishment, the modems synchronize themselves to establish a duplex
connection for data transmission.
