MULTI-FUNCTION LD CARD
This chapter describes the locations and posssible settings of the Multi- Function LD Card’s configuration controls, and provides detailed instructions for setting them. Section 3.1 tells you about the three 8-position DIP switches on the Card’s main (front) module. Section 3.2 tells you about the three jumpers (“straps”) on the Card’s interface (rear) module. Once you’ve configured the Multi-Function LD Card, it is designed to operate transparently, without needing to be frequently reconfigured. Just set it and forget it!
3.1 Setting the Switches on the Main Module
3.1.1WHERE THE SWITCHES ARE
The Multi-Function LD Card has three 8-position DIP switches—S1, S2, and S3—mounted on the circuit board of its main (front) module, as shown in Figure 3-1 below. These configuration switches allow you to select data rates, clocking methods, V.52 and V.54 tests, word lengths, extended signaling rates, sync or async protocol, 2- or 4-wire operation, antistream control, and input impedance. As shown in Figure 3-2 on the next page, the “ON” and “OFF” points are the same for all of the switch positions.
S1 S2
S3
(on other
side of board)
Figure 3-1. The main-module switches.
