Service manual

Network input
A-3
A
◆
TS and Network inputs
◆
Network input
E1 system Bit-rate: 2,048 Mbit/s ± 50 ppm. according
to ITU-T G.703
Line Code HDB3 according to ITU-T G.703
Frame structure According to ITU-T G.704
Effective payload MPEG-2-specified transport
stream
Error protection According to the DVB-C specifica-
tion for cable distribution, compris-
ing interleaving and (204,188)
Reed-Solomon forward error cor-
rection code.
Switching between error protection and no error protection is done automatically.
E1 input Number of inputs 2 high impedance inputs
Max number of decoders in the same link 5 within stated specifications (a
maximum of 60 cm cable between
the units).
Connector type 75 Ω BNC female
Input impedance 75 Ω unbalanced using external
75 Ω termination
Min. input level According to ITU-T Rec. G.703
-6 dB at 1024 kHz
Return loss According to ITU-T Rec. G.703
51 to 102 kHz > 12 dB
102 to 2048 kHz > 18 dB
2048 to 3072 kHz > 14 dB
Input jitter acceptance According to ITU-T Rec. G.823
1.2 x 10
-5
to 4.8 x 10
-3
Hz 36.9 UI
pp
4.8 x 10
-3
to 0.01 Hz Roll of 20 dB/decade
0.01 to 1.667 Hz 18 UI
pp
1.667 to 20 Hz Roll of 20 dB/decade
20 to 2400 Hz 1.5 UI
pp
2.4 to 18 kHz Roll of 20 dB/decade
18 to 100 kHz 0.2 UI
pp
AIS detection < 9 zeros in 8192 bits
E3 system System specifications
Bit rate 34.368 Mbit/s ± 20 ppm according
to ITU-T Rec. G.703.