Installation 2-7
2.7 Exchange Line Connection
POWER
To Terminal Board or Ports
from the Local Exchange
AB
A: Tip
B: Ring
View of TEL Port (Exchange Line)
Connection
1. Insert the modular plugs of the telephone line cords (2-conductor wiring) into the ports
(CO 1 through 3) on the system.
2. Connect the line cords to the terminal board or the ports from the Local Exchange.
Installing Lightning Protectors
A lightning protector is a device to be installed on an exchange line to prevent a dangerous
surge from entering the building and damaging the equipment.
A dangerous surge can occur if a telephone line comes in contact with a power line. Problems
due to lightning surges have been steadily increasing with the development of electronic
equipment.
In many countries, there are regulations requiring the installation of a lightning protector. A
lightning strike to a telephone cable which is 10 m above ground can be as high as 200 000 V.
This system should be installed with lightning protectors. In addition, grounding (connection
to earth ground) is very important to protect the system (☞ 2.5, Frame Ground Connection).
• Exchange Line ports are at TNV.
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PSQX1708ZA-03E.QX 99.10.15 5:46 PM Page 7