User's Manual

Selex ES S.p.A.
Information contained in this document may not be used, applied or reproduced for any purpose unless agreed
by Selex ES S.p.A. in writing
31
used to transfer from one to the other RBS the user payload and two of them are optionally used to
transfer E and M criteria.
All the signals are exchanged using a balanced type of connection, avoiding any ground reference.
For the two copper pairs used for exchanging the user payload, the impedance of the interface is 600
Ohm.
The characteristics of the pairs must be as follows:
Amplitude:
Amplitude characteristic of the media must comply with FIGURE 2/G.712 (ITU-T Rec.G.712 page 8).
The mask is shown below. Anyway in the audio band from 300 Hz to 3400 Hz the response must be
+/- 1,5 dB with respect to the nominal level of –10 dBm.
0 200 300 1020 2400 3000 3400 3600 Hz
dB
T1511850-02
0
–0.5
0.5
0.9
1.8
Loss
(see Note)
Frequency (
f
)
NOTE – In some applications in which several PCM channels may be connected in tandem, it may be
necessary to extend the +0.5 dB limit from 2400 Hz to 3000 Hz.
Group delay:
Group delay characteristic of the media must comply with FIGURE 6/G.712 (ITU-T Rec.G.712 page
10). The mask is shown below.
1000 2600 Hz
ms
0
T1511890-02
500 600 2800
0.25
0.75
1.50
Group delay distortion
Frequency (
f
)
Insertion loss: