Doorking 1812 Plus User Manual download pdf (Page 14)

1812-161-L-12-11

Telephone

Wire Conduit

High Voltage

Power Wire

Conduit

Electrical field from power wires.

18” minimum

Underground Cutaway

Note: Do not run telephone wires and high voltage power

wires in the same conduit. Separate the high voltage

conduit and the telephone conduit by at least 18 inches to

prevent any electrical field interference that could occur.

“Tip” and “Ring” Definition. Common terms in the telephone service industry referring to the two wires or sides of

an ordinary telephone line. Tip is the ground side (positive) and Ring is the battery (negative) side of a phone circuit. The

ground side is common with the central office of the telephone company (telco); the battery side carries -48 volts of DC voltage

when in an “Idle” or “On Hook” state.

Phone Line Polarity. Tip and ring reversal is mostly immaterial, except for special circuits including DID (Direct Inward

Dialing) trunks, T-1 lines, and ground start lines where the field side (“terminal”) equipment (a company's PBX switch, for

example) can only function correctly with correct tip and ring polarity.

Wire Type. It is extremely important to use the correct type of wire in telephone applications. Since the 1812 requires

phone lines to be run outdoors or in an underground environment, we recommend that you use only wire that is rated for

direct underground burial. For example, use Cat5e Gel Filled (flooded) UV Resistant Direct Burial Cable run in conduit for

your 1812 phone line requirements. Do not use thinly insulated brown-jacketed telephone wire (the type found in the walls of a

house) for outdoor or underground phone line wiring. Using improper wire can cause noise and hum on the phone line. Be

sure that phone wire pairs are twisted.

Wire Size and Distance. Phone lines can be run up to 3600 feet, provided that the proper wire size is used.

1.3 Telephone Line Wire

Be sure to observe electrical safety when working with phone lines. Phone lines carry electricity and the ring voltage can deliver

a substantial jolt. The best policy is to disconnect the house phone from the phone company Network Interface Device (also

known as ‘Demarcation Device’) before working on the wiring.

In most residential homes, the phone cable contains four wires; green, red, black, yellow. The green and red are twisted to make

one pair and the black and yellow are twisted to make another pair (This allowed for the addition of a second phone line since

telephones use only two wires). Most phone lines installed in the U.S. in the second half of the 20th Century have this type of

wire. This type of wire is now obsolete. All new telephone projects are using Cat5 wire. If you have Cat5 wiring in your home,

the conversion is simple:

The convention for Cat5 wire is as follows:

• Colored pairs match; e.g., WHITE/blue mark (Tip +) wire goes

with BLUE/white mark (Ring -) wire for one phone line, etc.

• The pairs are used in the order pictured: for the first line, you

use BLUE, for the second line you use ORANGE, etc.

• An easy way to remember this is that the colors run from the

sky to the earth. BLUE sky comes first; ORANGE sunset second;

GREEN grass third; BROWN earth last.

Cat5 Wire

Four Conductor

Wire

Tip (+)

1st Line

Wire

Conversion

2nd Line

3rd Line

4th Line

Green

Red

Black

Yellow

Blue Pair

Orange Pair

Green Pair

Brown Pair

Ring (-)

(+) Tip

(-) Ring

(+) Tip

(-) Ring

(+) Tip

(-) Ring

Older Residential

Homes

Modern Residential

Homes

Wire Size Max Distance

24 AWG

22 AWG

20 AWG

18 AWG

800 ft

1600 ft

2200 ft

3600 ft

Telephone Wire Run Table

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 49 50

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Doorking 1812 Plus User Manual Page 14

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