Chapter
Error! Style not defined.
Error! Style
not defined.
7-31
7.4 T1 Cabke
7.4.1 Functions
Abis interface adopts T1 cable as the 100
Ω
coaxial cable and connects the T1 interface
of board DSM to set top. The characteristic resistance of T1 cable is consistent with the
input and output resistance of the line transceiver set by the transceiver of board T1.
7.4.2 Connection Position of Two Ends, Wiring and Signal Flow Direction of
Cable
One end of the T1 cable is connected with the D-shape 44-core connector on the
backplane of BDS frame, while the other end is fixed on the transfer installation hole
of set top.
When DSM is configured as 100
Ω
T1, a D-shape 44-core connector is adopted on the
backplane of BDS frame. 8-channel T1 is supported; meanwhile extended 8-channel
T1 is provided. The system supports maximum 16-channel T1.
End A
Fl
ag
End B1
End B2
End B3
End B4
End B5
End B6
F l a g
F l a g
F l a g
F l a g
Fig. 7.4-1 100
Ω
T1 Cable Diagram
Table 7.4-1 100
Ω
T1 Cable Wiring and Signal Flow Direction
Serial No.
End A Outgoing Direction Flag
End B Outgoing Direction Flag
B1:BTS set top-BSC(EXT)_T1_0(IN0)
B2:BTS set top-BSC(EXT)_T1_0(OUT0)
1 BTS-BBDS4-IP_X71
(BSC_T1)
BTS-BBDS4-IP_X76
B3:BTS set top-BSC(EXT)_T1_1(IN1)
