Doorking 1820 Manuel d'utilisateur télécharger pdf (Page 23)

2.3 Powered RJ-71C Wiring

For the Call Down feature and programming from a resident telephone to function in this system, the

resident must have an active Central Office (C.O.) phone line. The C.O. phone line provides the

power for these features to operate. If a resident does not have an active C.O. phone line, then a

special POWERED RJ-71C (P/N 1820-047) phone block will have to be used.

Depending on the application, some residents may have an active C.O. phone line while others may

not. You should also consider that this could change in the future. If a resident changes status of

having active C.O. phone service, or not having active C.O. phone service, the phone line will need to

be physically changed from a standard RJ-71C phone block to a powered RJ-71C phone block, and

vice-versa. There are two options for wiring a powered RJ-71C block into the system.

2.3.1 Dual Line Interface Board Option

Refer to drawing 1820-065-8.

Benefits:

• Does not require moving any telephone company phone wiring.

Disadvantages:

• Requires additional Line Interface Boards. This must be factored into the equipment list and

the hardware is configured.

• Resident directory code / system relay number will change when phone wiring is removed.

• If programmable directory codes are in use, the directory code will need to be reprogrammed.

• Requires 1 extra Line Interface Board for every 12 phone lines without Central Office phone

service.

2.3.2 Dual RJ-71C Option

Refer to drawing 1820-065-9

Benefits:

• Additional Line Interface Boards are not required.

• Resident directory code / system relay number does not change.

• Does not require reprogramming when a resident’s telephone service status changes.

Disadvantages:

• Requires disconnect of the telephone company wiring.

1820-065-B-2-06 Page 23

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Doorking 1820 Manuel d'utilisateur Page 23