AUTODIAL No. 108
No. 108, sales name Tyne, has the capacity to store 50 telephone numbers with up to 18
digits, plus access digit and pause for PABX use, i.e. 20 digits, and dial them at the
press of one button. It is powered direct from a 9.5 volt ac Plug Top Transformer with a
72 hour memory back up battery charged from the transformer. The Tyne is supplied set for
Loop Disconnect dialling, but may be changed by an engineer on site to MF4 signalling by
opening the unit and altering the slide switch on the PCB and moving a wire link from
terminal NC (Normally Connected - terminal not marked) to NO (Normally Open). The switch is
located between the two PCB's at the cord entry end of the unit, is visible and easily
The wire link (LK2) provides a loop disconnect pulse shaping and bell shunt when set to NC (Normally Connected), and removes this network when moved to NO (Normally Open) to stop tone distortion and attenuation when MF4 signalling is used.
The second link, marked 70 140 indicates the duration of each MF tone in ms. The normal setting is 70, but occasionally, on old type equipment, it may require setting to 140.
To make an outgoing call from Tyne, the telephone handset must be lifted, dial tone received before pressing the required address memory button.
The Autodial 5000 is an Autodial No. 108C (Tyne) with the internal link set to NO (Normally Open) although the slide switch is set for Loop Disconnect pulsing. The Autodial 5000 is approved as issued for use on Ambassador and Senator systems.
If necessary, an Autodial 5000 may be restored to an Autodial 108C by removing the base and returning the plug ended wire link to NC (Normally Connected). Any other signalling changes are made as for the 108 detailed above.
All four autodials were supplied in Ambassador style cases coloured Stone, Grey and Brown. All the above products have now been withdrawn from the BT portfolio, but the existing base is expected to remain in situ for several years to come.
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.
Autodial 5000. Approval No. S/1000/3/F/450901 Approved for use on AESS and Senator.
all units must be sited within easy reach of 240 volt ac 13 amp mains supply and a phone socket.
PARTS DESCRIPTION BT Item Code Autodial No. 108C Stone Tyne 374559 Autodial No. 108C Grey Tyne 374560 Autodial No. 108C Brown Tyne 374561 Autodial No. 5000 Brown (Tyne with internal link set to NO) 870188 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
Storing a number:-
Note:- That unless Tyne is set for MF4 signalling 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.
Lift the telephone handset, wait for dial tone, then press the required address button. The callmaker will then dial the complete number, including for PABX's the access digit for external numbers as appropriate. When the callmaker is dialling out, a visual indication that the unit is working is given by a yellow LED flashing.
If at any time before the call is connected you wish to cancel the call, press the CAN
button. This will restore the line to dial tone.
p p 6 5 4 3 2 2 1 2 1 A 9.5 volt ac Blk Wht Grn Blu Or Red sp. power in
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
Last revised: February 24, 2021