xviii Issue 1 December 1997
Contents
Protection Circuitry 7-54
Fault Detection Circuitry 7-54
Performance Monitoring 7-54
Power Circuitry 7-54
21D/21D-U OLIU Quick Reference Summary 7-55
Transmit Functions 7-55
Receive Functions 7-55
Control Functions 7-55
Maintenance Signal Functions 7-55
21G/21G-U/21G2-U OLIU Circuit Pack
Description 7-56
Purpose of Circuit 7-56
21G/21G-U/21G2-U OLIU Faceplate Indicators 7-56
General Description of Operation 7-57
Detailed Description of Operation 7-57
Transmission Circuitry 7-59
Control Circuitry 7-59
Timing Circuitry 7-59
Protection Circuitry 7-60
Fault Detection Circuitry 7-60
Performance Monitoring 7-60
Power Circuitry 7-60
21G/21G-U OLIU Hardware Settings 7-61
21G/21G-U/21G2-U OLIU Quick Reference
Summary 7-62
Transmit Functions 7-62
Receive Functions 7-62
Control Functions 7-62
Maintenance Signal Functions 7-63
23G/23G-U OLIU Circuit Pack Description 7-64
Purpose of Circuit 7-64
23G/23G-U OLIU Faceplate Indicators 7-64
General Description of Operation 7-65
Detailed Description of Operation 7-66
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