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Appendix E: M3110, M3310, and M3820 telephones Page 489 of 504
Telephones and Consoles Description, Installation, and Operation
Note: If a power failure occurs, configurations that require loop power
will continue to work only if the system has battery backup. Only those
options that require additional power will cease to function.
Power supply board
The power supply option consists of a power supply board that mounts inside
the telephone, coupled with an external wall-mount transformer or closet
power supply that provides power to the power supply board. The power
supply board receives its power through pins 1 and 6 of the line cord.
The power supply board connects to the telephone through a 14-pin bottom
entry connector.
Local plug-in transformer
A single winding transformer equipped with a 10 ft. (3 m) cord of 22 AWG
two-conductor stranded and twisted wire with a modular RJ-11 duplex
adapter can provide the additional power needed to operate the telephone and
its options.
Table 82
Power requirements, Meridian digital telephones
Telephone type Loop power
Additional power
(Power Supply Board)
M3820 Terminal, handsfree, headset, key
expansion
MCA, External Alerter Interface
M3310 Terminal, headset, handsfree MCA, External Alerter Interface
M3110 Terminal MCA, External Alerter Interface
WARNING
Do not plug any equipment other than the terminal into
the RJ-11 transformer adapter, as damage to equipment
can result.