Connection
1. Insert the modular plugs of the telephone line cords (2-conductor wiring) into the
modular jacks (CO 1 through 3) on the system.
2. Connect the line cords to the terminal board or the modular jacks from the Central Office.
2.7 Outside (CO) Line Connection
Installing Lightning Protectors
A lightning protector is a device to be installed on an outside (CO) 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 {33 feet} 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).
Recommended lightning protectors
• TELESPIKE BLOK MODEL TSB (TRIPPE MFG. CO.)
• SPIKE BLOK MODEL SK6-0 (TRIPPE MFG. CO.)
• Super MAX™ (PANAMAX)
• MP1 (ITW LINK)
*
The illustration on this page is a KX-TA308.
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