Installation
340 PRS-7367
not take the cable. Do not twist, stretch, bend the cable. Invisible damage can increase the
attenuation of the fiber and can destroy the communication.
11.7.6 Install the communication cable
When using electrical connections between the protection device and the communication device,
or point-to-point electrical connections between the two protection devices, it is important to install
the cables carefully. Due to the low electrical level of communication signals, the factors
susceptible to noise interference must be considered.
The best way is to use shielded twisted pair(STP), one for each twisted pair and the other for the
all twisted pairs for surround shielding. Each signal uses the twisted pair shown in the following
figure to shield each individual twisted-pair cable by connecting its internal shielded cable to the
device's ground connection or, alternatively, to a device near the signal transmitter Connected, at
the receiving end, shielded line let it hang in the air, not connected with the ground. The outer
shield surrounding all twisted pairs is physically connected near each end of the equipment.
Cc: communication cable
Lc: line connector
Rx: receive signal input
Tx: transmit signal output
Sc: shielded (grounding) connection
11.8 Installation check
11.8.1 Check the installation
Check that all terminal screws with external wiring are tightened, the wiring is neat, and all wiring
labels are clearly defined.
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