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Page 332 of 544 European Digital telephones: 3110, 3310, and 3820
553-3011-100 Standard 14.00 January 2002
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. See “Configuration of local plug-in transformer” on page 303.
Table 101
Power requirements, Meridian digital telephones
Telephone 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
Te r mi n al MCA, External Alerter Interface
CAUTION
Do not plug any equipment other than the terminal into the RJ-11
transformer adapter, as damage to equipment can result.