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Chapter 3 External Cables
Figure 51
shows the structure of the 8–channel E1/T1 cable.
Fig-
ure 52
shows the structure of the 4–channel E1/T1 cable.
F
IGURE
51 8–
CHANNEL
E1/T1 C
ABLE
F
IGURE
52 4–
CHANNEL
E1/T1 C
ABLE
One end of the cable is a DB44 connector to connect to the light-
ning subrack and the other end contains 16 or 32 lines to connect
to the transmission equipment.
Table 35
describes E1/T1 cable pins.
T
ABLE
35 D
ESCRIPTION OF
E1/T1 C
ABLE
P
INS ON
L
IGHTNING
S
UBRACK
LPU
Se-
quence
Name
Signal Description
Pin at End
A
Pin at End
B
1
Transmits signal
positive (micro-coax
1 signal)
1-2-inner
25
2
E1_TX1-
Transmits signal
negative (micro-coax
1 shielding ground)
1-2-outer
24
3
Receives signal
positive (micro-coax
2 signal)
1-1-inner
23
4
E1_RX1-
Receives signal
negative (micro-coax
2 shielding ground)
1-1-outer
22
5
Transmits signal
positive (micro-coax
3 signal)
1-4-inner
4
6
E1_TX2-
Transmits signal
negative (micro-coax
3 shielding ground)
1-4-outer
3
7
Transmits signal
positive (micro-coax
4 signal)
1-3-inner
2
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Содержание CDMA Outdoor Basestation-8900
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