User's Manual
Table Of Contents
- 1. GENERAL
- 2. INTRODUCTION
- 3. CONNECTION SETUP
- 4. INSTALLATION
- 5. FUNCTIONAL DESCRIPTION
- 5.1. DIGITAL ARCHITECTURE
- 5.2. FEATURES
- 5.2.1. Filters Node M
- 5.2.2. Filters Node C
- 5.2.3. Digital ICE (Digital Interference Cancellation Equipment)
- 5.2.4. VSWR (Voltage Standing Wave Ratio)
- 5.2.5. RSSI (Receive Signal Strength Indication)
- 5.2.6. Alarm Forwarding
- 5.2.7. Downlink Final Amplifier
- 5.2.8. Power Supply Unit
- 5.2.9. Modems
- 5.2.10. Digital Channel Module (DCM)
- 5.2.11. External Alarm Controller - EAC-Board
- 5.2.12. Battery Pack - Battery On/Off
- 5.2.13. UL and DL Duplexer
- 6. MAINTENANCE AND REPLACEMENT
- 7. ILLUSTRATIONS
- 8. INDEX
User’s Manual for Node M and Node C
Network Elements
Page 52 M0121A4A.doc
5.2.11.3. External Alarms
The external alarms are used to monitor the status of one or more external devices
via the Node M/C. A UPS or entry alarm is among the items that might be connected
to the contact relay and monitored via the Node M/C. The cage clamp connectors are
located on the EAC-board.
Observe that the cross-sectional area of the wires to be connected must be in the
range from 0.5 - 1.0 mm
2
. Do not use wire-end sleeves (wire cable ends).
2 n.c.
1 n.c.
4 GROUND
3 EXT_ALARM_3
6 GROUND
5 EXT_ALARM_2
8 GROUND
7 EXT_ALARM_1
10 PSTN_1_EXTERNAL
9 PSTN_1_INTERNAL
12 PSTN_2_EXTERNAL
11 PSTN_2_INTERNAL
14 GROUND
13 SUMMARY ALARM, LED GREEN
16 GROUND
15 SUMMARY ALARM, LED RED
figure 5-19 Pin assignment
1
2
16 15
figure 5-20 External alarm clamps, installed
External Alarms 1 to 3
Input voltage range 5 Vdc
Recommended input line Potential free
Nominal sink current to ground 15 mA
Active level High or low set via software
Connectors Cage clamps