Siemens SINAUT ST7 - Page 216

Installing and putting a SINAUT modem into operation
5.5 MD2 dedicated line modem
Station control system
216 System Manual, 07/2009, C79000-G8976-C178-07
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Figure 5-22 Two MD2s as 4-wire repeater with simultaneous 4-wire tapping of a TIM (for example
TIM 3V-IE)
In most cases, a repeater is placed at a location where there is also an ST7 station that
includes a TIM. For this reason, the schematics show not only the connection of two MD2s to
form a repeater but also how a TIM is tapped into the 2-wire or 4-wire cable at the location of
the repeater.
Transmission speeds and frequencies of the MD2 modem
Table 5- 18 Transmission speeds and frequencies of the MD2 modem
Transmission
speed (bps)
Center frequency
[Hz]
Frequency
deviation Δf (Hz)
Lower keying
frequency (Hz)
Upper keying
frequency (Hz)
1200 1700 400 1300 2100
2400 2850 450 2400 3300
9600 / 19,200 27,200 6400 20,800 33,600