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Installation Manual – BTS3606 Cabinet Installation
Airbridge BTS3606&3606A CDMA Base Station
4.6.1 Introduction to E1/T1 Trunks
The E1/T1 trunks are used to connect the E1 lightning protection board and
transmission interface box. Figure 4-17 shows the 75 Ω coaxial E1/T1 trunks.
Note:
The appearance of the 120 Ω E1/T1 trunk is the same with that of the 75 Ω E1/T1
trunk.
(1) DB25 connector (X0)
(5) External conductor of coaxial trunk (Ring, namely, braid layer)
(6) Core of coaxial trunk (Tip)
Figure 4-17 75 Ω E1/T1 trunks
When installing E1/T1 trunks, pay attention to the correspondence between the E1
cable and DB25 connector. Table 4-4 describes the correspondence between the E1
cable and DB25 connector.
(2) Main label
(3) Assistant label 1
(7) 75 Ω coaxial trunk (X1–X8)
Huawei Technologies Proprietary
4-21
Chapter 4 Installing Cables
(4) Assistant label8
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