Motorola 68230 - Vanguard 300 DSU/CSU Operator's Manual page 61

Strapping the DIM Site Daughtercard
Overview
This section describes how to strap the DIM Site daughtercard.
Strapping the DIM Daughtercard
The strapping on the DIM daughtercard typically comes configured from the
factory in Ring Indicator mode, which causes pin 22 on the DB25 connector to
indicate the presence of an incoming call to the attached DTE. Otherwise, the
strap is set to Test Mode (see Figures 4-11 and 4-12).
Steps to Set Strap on a DIM daughtercard
Follow these steps:
Step Action
Power down and disconnect the Vanguard 300/305 before you set the
1
strap on a DIM daughtercard.
Unplug the power cord from the primary power source and remove
2
interface cables and power cables.
Remove the top cover of the Vanguard unit.
3
Set the strapping as shown in Figures 4-11 and 4-12 for the following:
4
Pin 22: Normally defined as Test Mode Indicator, an input for a DCE
device. However, you can configure it as an output and use it in Ring
Indicator mode when the port is configured to emulate a dial modem
(DCE only).
Pin 25: Normally defined as Make Busy, an input for a DCE device.
However, you can configure it as an output (Make Busy) or an input
(Test Mode) when the port is a DTE.
Push the strap down onto the pins.
5