Micro-Aide LDM-1 Manual de usuario descargar pdf (Pagina 21)

Setup and Installation - Installation

distinct settings are available. Table 2 details the correspondence between

Equalization settings and switch positions.

Selecting the proper Equalization setting relates directly to cable length and

wire diameter. The higher settings are used when the master and slave

modems are separated by a greater distance and/or a smaller wire diameter is

employed. Table 6 on page 31 includes a list of suggested Equalization set-

tings. The factory default Equalization setting is 1 (i.e., minimum).

ERMANENTLY ASSERTING THE RTS

The LDM-1 can be used with DTE interfaces that lack RTS and CTS signals

provided the modem’s use is limited to point-to-point networks or as a master

in a multi-drop network. For these applications the DTE-to-modem cable

must include a jumper between pins 4 (RTS) and 6 (DSR) at the LDM-1 end.

This technique will force the modem’s RTS to be constantly asserted. Figure 7

on page 31 illustrates the pin assignments used by the LDM-1’s DB-25 con-

nector.

INSTALLATION

Physical installation of the modems and nests can be performed after the con-

figuration settings are in place.

LDM-1 S

TANDALONE

The standalone version LDM-1 can be placed in any convenient location. It

generates very little heat and utilizes no hazardous voltages. A desktop or

shelf within several feet of the network lines is perfectly satisfactory as a

Equalization

Setting

Switch 3-1 Switch 3-2 Cable

Length

1 (min. default) On On Short

2 Off On Mid-range

3 On Off Mid-range

4 (max.) Off Off Long

On=down Off=up

Table 2 - Equalization Settings

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 47 48

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Micro-Aide LDM-1 Manual de usuario Pagina 21