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User Manual
Airbridge cBTS3612 CDMA Base Station
Into the
cabinet
(8 pairs of
E1s)
Figure 2-31 Physical appearance of BESP
E1 lightning protection unit has two inbound lines connected with DB25, two
outbound lines connected with DB37, and one PGND. Here PGNDs of all lightning
protection units can be interconnected. DB37 is male connector and DB25 is female
connector, with 8 pairs of shielded E1 cables connected. 75 Ù and 120Ù impedance
match is provided with the cables. The principle of lightning protection units is as
shown in Figure 2-32.
16 E1 lightning
DB37
protection units
Fixing hole Ф 3.5
PGND Ф 10
128mm
2-61
System Description
2 Hardware Architecture
6mm
Out from the
cabinet
(4 pairs of
E1s)
10mm
Out from the
cabinet
(4 pairs of
E1s)
6mm
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