Multitech MT56DSU-R Owner's Manual download pdf (Page 29)

Chapter 3 - Operation

3.3 LED Indicators

The front panel of the MT56DSU-R contains ten LED indicators that

can help in troubleshooting network or device problems. Chapter 4

of this manual contains detailed information on the LED indicators.

3.4 Functions

This section describes the two optional MT56DSU-R modes of

operation. The MT56DSU-R can be used as either a point-to-point

Local Area Data Set (at speeds up to 56K bps), or in an off-net

extension application using conventional analog lines and modems

(to complete DDS communications in areas without DDS

availability).

3.4.1 Local Area Data Set Applications

Your MT56DSU-R can be used as a point-to-point LADS (Local Area

Data Set) at transmission speeds of 2400, 4800, 9600, 19200 or

56000 bps over 4-wire, non-loaded metallic wire pairs.

The MT56DSU-R conforms to the signal power requirements of

Bellcore Pub. 41028 (data sets used on LADC), when used at

subrate speeds (less than or equal to 19200 bps). The MT56DSU-R

does not meet this requirement at the 56K bps rate. The 56K bps

rate may be used in applications with customer-supplied lines, or

lines not covered by Pub 41028, or other tariff requirements.

The installation of the MT56DSU-R in a LADS application is the

same as for DDS applications, except for the timing (Clocking)

setting. LADS applications require one MT56DSU-R to be set for

Internal timing and the other MT56DSU-R to be set for DDS timing

(refer to Chapter 2 of this manual). The network cable connection

requires cross-over wiring; the transmit pair of each MT56DSU-

R must be connected to the receive pair of the far-end MT56DSU-R.

The MT56DSU-R uses 4-wire non-loaded metallic circuits for LADS

applications. The table below outlines approximations for the

maximum cable length for limited distance applications.

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Multitech MT56DSU-R Owner's Manual Page 29