Nera Evolution Series - Ifu-Odu Interface; Cable Interface Characteristics; Cable Characteristics

34 Evolution Series - XPAND NGP\00329 Rev. C 23-06-2006
5.6. IFU-ODU Interface
5.6.1. Cable interface characteristics
The following signals are transmitted via the cable:
• Transmit and Receive data signal.
• Power to the ODU.
• IFU - ODU Communication (IO-Com) for configuration and control of the ODU.
The cable interface has over-voltage, over-current and reverse polarity protection.
The equipment compensates automatically for different cable lengths.
5.6.2. Cable characteristics
The cable must be in accordance with the following requirements:
Characteristic impedance: 50 ± 3 Ω
Maximum attenuation at 47 MHz: 9 dB
Maximum attenuation at 140 MHz: 18 dB
Maximum attenuation at 373 MHz: 30 dB
Maximum cable length: 300 m
Connector: TNC, male
Recommended cables and maximum lengths at 40.5 Volt:
Cable
50Ω
ΩΩ
Ω
Maximum cable length with
minimum supply voltage. (40.5
volt)
Cinta CNT 400 (¼″) (Andrew)
200
Heliax LDF1-50. (¼″) (Andrew)
200
Cellflex LCF 14-50J(¼″) (RFS)
200
Heliax LDF2-50. (3/8″) (Andrew)
300
Cellflex LCF 38-50J (3/8″) (RFS)
300
Table 5-18 Cable lengths, IFU-ODU cable