Selex ES SPA F567DHDE-HP 用户手册

 

SELEX Communications 

 

 

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 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

Lo

ss

(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 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

G

roup

 d

ela

y

 di

st

ort

ion

Frequency (f)