No. 109, sales name Trent, offers the same facilities as (Tyne),
plus several other benefits listed below:-
- On hook dialling with monitor loudspeaker to keep the caller informed of call progress.
- LED display showing the number called, automatically changing to a call timer once the
handset is lifted and the call begins.
- 24 hour clock when the unit is not in use. Time and date.
The following are minor differences compared to Tyne:-
The MF4/LD slide switch is between the two PCB's, but is placed along the side of the
To make an outgoing call, the required address memory button is pressed and the built in
loudspeaker monitors the progress of the call. The telephone handset must be lifted once
the called party answers. The volume of the monitor amplifier / loudspeaker is adjustable
by a three position switch on the back of the unit.
Made by Sontranic (CHC Group) Ltd.
Supplied by BT on both rental and sale terms.
"Grandfathered" Approval. i.e. Approved before 1 October 1981.
Approved as supplied for connection to the Public Switched Telephone Networks (PSTN's) and
2-wire PBX extensions.
All units must be sited within easy reach of 240 volt ac 13 amp mains supply and a phone
DESCRIPTION BT Item code
Autodial No 109C Stone Trent 374562
Autodial No 109C Grey Trent 374563
Autodial No 109C Brown Trent 374564
Nickel Cadmium Battery 100 mAh, 3.6 volt PCB mounting 665376
Fuse 73/0.16 (Plug top transformer fuse, not always provided) 314317
Line Jack Unit 10/7A Doubler Jack with Cord. 374422
When originally introduced in 1983, it was considered the main use of the autodiallers
would be as an attachment to PABX extensions. For this reason, the user guide in all cases
refers to the autodiallers as having 18 store memories and not 20. The reason for
marketing in this manner, was that after the customer has entered the PABX access digit
and Pause, they then have 18 usable digits to programme into any memory store.
There is a backup battery which will keep the stored memory for about 72
hours. The LCD dispaly will only operate with the mains transformer
A unit that displays the symptoms of sending wrong numbers and unable to program is
usually caused by a faulty battery.
To Set the Time and Date:-
- Press STO button twice, and keep pressed the second time. This will display an empty
screen for a new unit, or the time and date that requires alteration.
- Using the numbered buttons set the time and time. Digits appear on display as you key
them in. Use 24 hour clock i.e. HH. MM. DD. MM. YY.
- The clock will continue when you release the STO button.
- If you make a mistake, press the CAN button and release STO. Start again from step
Storing a number:-
- Press and hold down the button marked STO. A row of dots appears on
- Press and release the selected address button. Any one of the 50. The dots on screen
- Use the numbered buttons (right side) to input the desired number. Up to 18 digits. The
programmed digits will appear on the display as they are keyed in. When connected to a
PABX that requires a Pause after the Access Digit, Press button 'A' once.
- Release the STO button when the number is stored and write the name or telephone number
on panel adjacent to button.
Note:- That unless Trent is set for MF4 signalling by an engineer at installation, the *
and # buttons have no function. There is no soft switching from LD to MF4 by pressing the
* button as with most modern equipment.
To call a stored number:-
- With the telephone handset on its rest, select the desired address button and press it
once. You will hear Dial Tone via the loudspeaker monitor and as the dialling progresses,
the digits will appear on the display as they are dialled. The volume of the monitor can
be adjusted by the three position switch at the rear of the unit.
- When the call is answered, lift the telephone handset to speak. The display will then
show a count of seconds and minutes until the call is terminated. The display will then
revert to the time and date.
If at any time before the handset is lifted you wish to cancel the call, press the CAN
button, this will release the call.
Should you wish to switch back to the monitor during a call, press and keep pressed the
MON button until the telephone handset is replaced. You can switch between the monitor
speaker and handset as often as you like during a call, including incoming calls or calls
dialled from the telephone.
Certain types of PABX do not signal the public exchange dial tone, e.g. Monarch 120. In
this case when storing numbers, do not programme a pause after the access digit. The
continue (CON) button, if pressed will allow the callmaker to continue dialling in the
absence of continuous dial tone.
Reprogramming an address store automatically over writes the previous number. To clear a
store, press and keep pressed the STO button, select and press the required address button
then release the STO button.
LJU 10/7A cord connections for all autodials is as follows:-
p p 6 5 4 3 2 2 1
2 1 A
9.5 volt ac Blk Wht Grn Blu Or Red sp
Note:- If for any reason all 6 cord conductors are required for through connection such as
when used on a PMBX 2/... , then strap terminals 4 & 6 (Black & Green) within the
NC (Normally Connected)
Used for pulse signalling.
Pulse shape & Bell shunt circuit connected.
NO (Normally Open)
Used for MF4 signalling.
Pulse shape & Bell shunt circuit disconnected.
Link 70 / 140
Set to 70 (MF4 tone
duration in ms). Setting 140 is only required on some old type equipment.
Loop Disconnect Pulsing or MF4 signalling.