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ADCP-50-304 • Issue 19 • June 1999 • Section 4: PatchSwitch X.21
Page 4-2
© 1999, ADC Telecommunications, Inc.
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.
2.1 PSM-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.
Figure 4-1. PSM-812001 Module Block Diagram
SWITCHING
CIRCUIT
ALARM
CIRCUITS
1628-A