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

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:
Maximum attenuation at 47 MHz:
Maximum attenuation at 140 MHz:
Maximum attenuation at 373 MHz:
Maximum cable length:
Connector:
Recommended cables and maximum lengths at 40.5 Volt:
Cable
50Ω Ω Ω Ω
Cinta CNT 400 (¼") (Andrew)
Heliax LDF1-50. (¼") (Andrew)
Cellflex LCF 14-50J(¼") (RFS)
Heliax LDF2-50. (3/8") (Andrew)
Cellflex LCF 38-50J (3/8") (RFS)
34
50 ± 3 Ω
9 dB
18 dB
30 dB
300 m
TNC, male
Maximum cable length with
minimum supply voltage. (40.5
Table 5-18 Cable lengths, IFU-ODU cable
Evolution Series - XPAND
volt)
200
200
200
300
300
NGP\00329 Rev. C 23-06-2006