Issue 6
Electra Elite
5 - 50
Installing Electronic Telephone Units
4.10.5
Alarm Conditions
A brief description of each alarm condition referred to
under the SW2, position 0 alarm Indications is given
below.
Layer 1 Status
LED is on red when layer 1 is active. The LED is off
when layer 1 is inactive.
Controlled Slip indication (SLIP)
When the difference between the timing of a
synchronous receiving terminal and the received
signal exceeds the buffering ability of the
synchronous terminal, the LED is on red.
Remote Alarm Indication (RAI) Detection
When RAI is received, the LED is on red.
Loss of Frame (LOF) Condition Detection
When two of the four or five framing data bits
received are in error, the LED is on red.
Alarm Indication Signal (AIS) Detection
When the system is receiving an Alarm Indication
Signal from a PRT trunk, the LED is on red.
Cyclic Redundancy Check (CRC) Error Event
Detection
When a CRC Error occurs, the LED is on red.
Active Call
LED is on red to indicate an active call.
4.10.6
Connectors
The PRT(1)-U( ) ETU has two connectors:
CN1
Connects to the backboard
CN3
9-pin RS-232C connector used for
maintenance
Summary of Contents for ElectraElite 48
Page 2: ...SYSTEM HARDWARE MANUAL Stock Number 750376 Issue 6 Series 8000 48 ...
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Page 10: ...Regulatory Information ...
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Page 51: ...Issue 6 Electra Elite xxxii List of Figures THIS PAGE INTENTIONALLY LEFT BLANK ...
Page 56: ...1st Tab Chapter 1 Introduction ...
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Page 78: ...2nd Tab Chapter 2 System Specifications ...
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Page 102: ...3rd Tab Chapter 3 Hardware Requirements ...
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Page 110: ...4th Tab Chapter 4 Installing the KSU ...
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Page 136: ...5th Tab Chapter 5 Installing Electronic Telephone Units ...
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Page 256: ...6th Tab Chapter 6 Installing Electra Elite Multiline Terminals ...
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Page 290: ...7th Tab Chapter 7 Installing Optional Equipment ...
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Page 344: ...8th Tab Chapter 8 Installing Dterm Series i Equipment ...
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Page 358: ...Electra Elite Issue 6 System Hardware Manual 8 13 Figure 8 15 Removing the Line Panel ...
Page 396: ...9th Tab Chapter 9 Installing Electra Professional Equipment ...
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Page 404: ...10th Tab Chapter 10 System Maintenance ...
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Page 428: ...11th Tab Appendices ...
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Page 434: ...SYSTEM HARDWARE MANUAL NEC America Inc Issue 6 Series 8000 48 ...
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