ADCP-50-304 • Issue 19 • June 1999 • Section 4: PatchSwitch X.21

2 DESCRIPTION

The ADC PatchSwitch X.21 modules provide monitor and patch access to X.21 leads. Some modules also provide local and remote alarming, testing, or status indicators.

2.1PSM-812001 X.21 LED/Alarm Patch Module with A/B Switching and Off-Line Patch Access

This module provides monitoring and access to 15 active X.21 leads, A/B Switching, LED signal status indication, and call request and termination time-out alarming. A block diagram representing the PSM-812001 Module is shown in Figure 4-1.

SWITCHING

CIRCUIT

ALARM

CIRCUITS

1628-A

Figure 4-1. PSM-812001 Module Block Diagram

Page 4-2

© 1999, ADC Telecommunications, Inc.