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8.4
Transmission unit
The cabling of the transmission unit is dependent on the transmission unit type.
This section instructs how to cable each transmission unit type.
Note
It is a good procedure to label the TX and RX cables when you connect them to
the transmission unit. This makes any subsequent maintenance or upgrade
procedures easier.
8.4.1
FC E1/T1 transmission unit
Either separate 75 Ω RX and TX connectors (type BT-43), or one 120/100 Ω
TX/RX connector (type TQ) can be used.
Note
The 75 Ω TX and RX connectors are connected to each other with a grounding
bridge (see Figure 20). If the grounding bridge is removed, the grounding of the
RX connector's outer conduct changes from direct grounding to capacitive
grounding.
58 (72)
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Nokia Proprietary and Confidential
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Installation
DN991456
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