Page332 of 544 EuropeanDigital telephones: 3110, 3310, and 3820
553-3011-100 Standard14.00 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 1 01
Power requirements, Meridian digital telephones
Telephone Loop power Additional power
(Power Supply Board)
M3820 Terminal, handsfree,
headset, key expansion
MCA, External Aler ter Interface
M3310 Terminal, headset, handsfree MCA, External Aler ter Interface
M3110 Term i n a l MCA, External Aler ter Interface
CAUTION
Do not plug any equipment other than the terminal into the RJ-11
transformer adapter, as damage to equipment can result.