User's Manual
Table Of Contents
- 1. Getting started
- 2. Introduction
- 3. Preparation
- 4. About the terminal
- 5. Mounting and installing the terminal
- 6. Connecting to the terminal
- 7. Managing the terminal
- 8. Configuring the terminal
- 9. Configuring the traffic interfaces
- 10. Cross Connections
- Embedded cross connect switch
- The Cross Connections application
- The Cross Connections system requirements
- Installing the Cross Connections application
- Opening the Cross Connections application
- The Cross Connections page
- Setting the terminal's address
- Management and user ethernet capacity
- Setting card types
- Getting cross connection configuration from the terminals
- Creating cross connections
- Sending cross connection configuration to the terminals
- Saving cross connection configurations
- Using existing cross connection configurations
- Printing the cross connection configuration
- Deleting cross connections
- Configuring the traffic cross connections
- Cross connection example
- Symmetrical Connection Wizard
- 11. Protected terminals
- 12. In-service commissioning
- What you will need
- Checking the antenna polarization
- Visually aligning antennas
- Accurately aligning the antennas
- Synchronizing the terminals
- Checking performance
- Checking the receive input level
- Checking the fade margin
- Checking long-term BER
- Bit Error Rate tests
- Additional tests
- Checking the link performance
- Viewing a summary of the link performance
- What you will need
- 13. Maintenance
- 14. Troubleshooting
- 15. Interface connections
- 16. Alarm types and sources
- 17. Country specific settings
- 18. Specifications
- Ethernet interface
- QJET Quad E1 / T1 interface
- Q4EM Quad 4 wire E&M interface
- DFXO Dual foreign exchange office interface
- DFXS Dual foreign exchange subscriber interface
- QV24 Quad V.24 asynchronous data interface
- HSS Single high speed synchronous data interface
- External alarm interfaces
- Auxiliary interfaces
- AC Power supply
- DC Power supply
- Power consumption
- MHSB protection
- Ethernet interface
- 19. Product end of life
- 20. Abbreviations
- 21. Acknowledgments and licensing
- 22. Commissioning Forms
- 23. Index
Specifications | 245
Q4EM Quad 4 wire E&M interface
General
Audio 64 kbit/s (PCM A-Law as per ITU G.711)
32, 24 & 16 kbit/s (ADPCM as per ITU G.726 and ANSI
TI.303)
E&M signalling 8 kbit/s per port
Maximum line length 400 metres
Analogue
Transmission performance
characteristics
ITU G.712 E4 for an operating level range of -14 dBr to +4
dBr
Input level range -14.0 dBr to +4.0 dBr in 0.5 dB steps
Output level range -14.0 dBr to +4.0 dBr in 0.5 dB steps
Default output level 0 dBr
Default input level 0 dBr
Maximum level +3.14 dBm0
Port impedance 600 Ω
Return loss better than 25 dB over the frequency range 200 - 3600 Hz
Transformer isolation 3.88 kV
End to end gain
Frequency response
0 dB ± 0.1 dB (300-3000 Hz)
0 dB ± 0.5 dB (250-3400 Hz)
Audio line protection Secondary protection
Signal to total distortion > 30 dB (0 dBm0 to -30 dBm0)
> 22 dB (-45 dBm0)
Signalling
E&M Mode independent (external power supply / ground reference
required)
Pulse distortion 4:1 multiplexed < 2.250 ms
Non-multiplexed
≤ 250 µs
M loop current 5.0 to 6.5 mA (constant current)
M detection voltage 9 VDC
M maximum voltage 60 VDC
E circuit impedance 45 Ω closed
> 100 kΩ open
Maximum E circuit current 100 mA
E maximum voltage 60 V
E&M circuit protection E: Current limited to 120 mA, overvoltage to 350 V
M: Current limited to 6.5 mA, overvoltage to 100 V
Diagnostics
Hardware Green LED: M circuit active
Yellow LED: E circuit active