The MD3 modem can be used as a telephone modem or dedicated-line modem independently of the SINAUT ST7 system. Due to its design and electrical properties, the MD3 is especially suited for use in the industrial sector.

Telephone modem

When used as a telephone modem, it enables connections to be set up with other MD3 or compatible modems, e.g. with the MD125 and MDM2425B DX modems that were used with the SINAUT ST1 system.

Dedicated-line modem:

Apart from private dedicated lines, the MD3 can also be connected to Telekom leased lines. Corresponding approval exists. There are no restrictions in terms of the possible transmission rates either with exclusively analog leased lines or with analog/digital converted leased lines.

When used as a dedicated-line modem on private lines, the MD3 enables distances of up to 34 km (at 300 bit/s), 28 km (at 1200 to 19200 bit/s) and up to 19 km (at 33600 bit/s) to be spanned without amplifiers/repeaters (guide values for uncoiled communication cable of type 2 x 2 x 0.8 J-Y(St)Y).

When connected to Telekom leased lines, any distance can be spanned. Depending on the quality of the leased line in each case, the leased line provider guarantees sufficient reception signal level at both end points. The line qualities M1020 and M1025 are recommended.

Used as a dedicated-line modem, the MD3 enables networks to be constructed in "point-to-point" or "star" configurations. If the modem is used in the central office, the star network can be expanded to as many as 32 point-to-point connections by linking several MD3 modems via their RS485 interface.