C MARKETING - INSTALLATION
AUTODIAL No. 101A (KEY
Description and Installation
instruction describes and details the installation of the
Autodial No 101A (Key
Callmaker), which enables subscribers connected to Automatic
exchanges or PABXs (not PABX
5 or 6) to call other frequently used numbers without the
necessity of remembering or
dialling the telephone number. To call other subscribers and in
the event of mains
failure, the normal telephone dial may be used. The Autodial
cannot be used on shared
service lines and House Exchange Systems and is not recommended
for use on PMBXs.
The Autodial is a repertory dialler, giving a capacity of
sixteen digits per address and
thirty-two addresses. The operation of an address button allows
a predetermined telephone
number to be transmitted to line in the form of 10 pps
loop/disconnect pulses. A simple
amplifier and loudspeaker is provided to monitor the progress of
calls and the handset of
the associated telephone need only be lifted for conversation
when the call has matured.
The addresses are stored on a translation field by means of wire
The items which comprise an Autodial No 101A are a Key Unit No
1A, a Translator No 1A, a
Power Unit No 86A, a Box Connection No 6A, 200 Connectors No
1001A, an Insertion Tag No 1
and an Extractor No 11.
The Key Unit No. 1A is a desk unit measuring 9 inches x 7 inches
x 3 inches, and houses
the thirty-two address buttons, a cancel button, an ON-OFF
switch, a miniature
loudspeaker, and two lamps, which indicate when the dialler is
in use and when the power
is on. The address buttons are arranged in four columns of eight
and each button is
provided with a paper designation label protected by a
transparent plastic cap. When a
button is operated it remains locked down while the autodial is
controlling the call.
The Translator No 1A is a wall-mounted unit measuring 18 inches
x 10 inches x 4 inches and
houses the autodial circuitry and the translation field. (Figure
2). It is connected to
the Key Unit, via a Box Connection No 6A, by a 41-wire cable.
The power unit and the line
are connected to the translator by two one-pair cables. The
telephone is connected to it
by a three-wire cable.
The Power Unit No 86A is a wall mounted unit measuring 8 inches
x 5k inches x 3k inches.
It is mains operated and gives an approximate off-load DC
voltage of 18 volts.
The Connectors 1001A are tag ended wires used for address
programming and are supplied in
four colours in units of 25.
The following items should be requisitioned:-
Translator No. 1A
Key Unit No. 1A
Power Unit No. 86A
Inserter Tag No. 1
Extractor No. 11
Connectors 1001A (Red)
Connectors 1001A (Blue)
Connectors 1001A (White)
Connectors 1001A (Green)
Box Connection No. 6A
Cable PVC No 1 41W/6* lb. as required
Cable PVC No 1 4W/6k lb. as required
A three-pin mains plug to suit the socket outlet provided by the
subscriber and a 3-core
mains cable should also be obtained.
Location and Mounting
The Box Connection No. 6A should be mounted such that, when the
Connector No 1046A is
joined to it, the cord leads out naturally and allows the key
unit to be positioned
adjacent to the telephone. The Translator No 1A should be wall
mounted, in an upright
position, at a comfortable working height and In a well-lit
situation agreed by the
subscriber and within a 30-yard cable run of the key unit. Cable
runs of up to 60 yards
may be used provided the subscriber Is satisfied that the level
of reproduction in the
monitor amplifier loudspeaker Is acceptable. Round Head No 6
wood screws at least 1 inch
long should be used for mounting the translator.
The power unit should be mounted close to the translator. The DC
output can be connected
to the translator or the box connection as convenient.
To gain access to the terminals In the translator once the lid
has been opened, the four
screws from the extreme corners of the unit should be unscrewed
allowing the terminal
cover to be removed. Cables entering the translator should be
clamped in position with the
(a) Power Unit Connections. Check that the mains-transformer
Input is S trapped correctly
for the local mains supply. Connect the power unit as shown In
(b) Direct Exchange Line Connections. The Auto Dial should be
connected as shown on diagram
(c) Connection to PABX Extension. The Autodial should be
connected as shown on diagram N
2310 with the exception that the green conductor In the
telephone cord should be
transferred from the box connection terminal 50 to box
connection terminal 48. The PABX
recall earth should be connected to box connection terminal 48
and the telephone wired
according to Diagram N 806 panel 4.
(d) Connection to Single Line Extension Plans. The Autodial
should be connected directly
to the exchange line as follows:-
Disconnect the line pair from the extension-plan terminal block
and connect it to the box
connection terminals 54 and 56 as shown on diagram N 2310. The
telephone shown on diagram
N 2310 is not required and the box connection terminals 50 and
52 should be connected to
the terminals on the extension plan terminal block from which
the line pair was removed.
The selected telephone of the extension plan may now be used
with the Autodial. Other
connections should be made according to diagram N 2310.
If sufficient spare terminals exist in the box connection all
the extension-plan wiring
should be transferred to these terminals allowing the original
terminal block to be
recovered. When this is done a local record should be made to
assist - subsequent
It should be noted that in the case of a Plan 105 or Plan 107
the Autodial may be
connected at the extension to the incoming pair to the telephone
as if it were the line
pair, according to the above principles.
(e) Connection to Extension Plans with more than one Line. The
Autodial can only be
connected to one selected exchange line and should be connected
according to the wiring
principles described in paragraph (d) above.
Translator Permanent Straps
Two rows of tags in the top left hand corner of the lower
circuit board of the translator
are accessible when the terminal cover is removed. The tags
should be checked that they
are strapped as shown on diagram N 2310. The 'LEVEL' tag is
normally strapped to the
"DIGIT 91 tag thus allowing an access digit 191 followed by a
pause to be transmitted when required at PABXS. Should the
access digit required be of a
value other than 191 then the strap should be moved to the
appropriate digit digit tag.
The 'XCH LINK' renders the access digit preceding the ISD code
ineffective and should only
be removed when the Autodial is connected to a PABX extension.
The translation field has thirty-two groups of thirteen tags.
One tag is labelled
"Access' and the remainder are numbered 1 to 12. There are
fourteen slotted bars
between the tag groups, representing digits 1 to 0, EXCH, ISD,
STOP and one spare bar. The
appropriate tags of each address should be connected to the
digit bars by use of
Connectors No 1001A. The connector tag should be located in the
end of the Inserter Tag No
1, with the connector wire laying in the groove in the shank of
the tool. The tag can then
be pressed onto the appropriate address tag. This process should
be repeated with the
other end of the connector so that it is located horizontally in
a slot on the required
Should it be necessary to remove a connector, the Extractor No
11 should be hooked into
that part of the tag - immediately below the crimp and gently
pulled off the terminal. The
connectors are sup- plied in four colours for ease of
Identification. Each address should
be wired using connectors of the same colour and adjacent
addresses using connectors of
(a) Autodials connected to a direct exchange line. To store a
telephone number on the
translation field, tag 1 of the chosen address is connected to
the digit bar corresponding
to the first digit of the telephone number, tag 2 is connected
to the digit bar
corresponding to the second digit and so on. When the last digit
has been connected the
next free tag is connected to the STOP bar.
(b) Public Network calls from a PABX. When public network calls
are required from a PABX
extension, a public exchange access digit is required, normally
9. By dialling this number
access is provided to the public network, and, on receipt of
dial tone, the remainder of
the number is dialled. By connecting the ACCESS tag of an
address to the EXCH bar the
Autodial is programmed to dial 9, apply a two-second
Inter-digital pause (to allow for the
receipt of public exchange dial tone) and then transmit the
(c) ISD telephone numbers. When an international number is
required the ISD (International
Subscriber Dialling) code 010 is set up by connecting the
appropriate ACCESS tag to the
ISD bar, the remainder of the number being connected as in para
a above. If the ISD number
is required from a PABX extension, the permanent straps cause
the digit 9 and a long
interdigital pause to be transmitted before the 010.
(d) Local PABX numbers. The translation field is wired as for a
direct exchange line and
the ACCESS tag is left spare.
(e) Spare addresses. These should be left unconnected.
Labelling of Key Unit Buttons
The name should be written (or typed) on the centre portion of
the label and the number
may be written on the side section. The label is held captive by
the transparent button
top. To gain access to the label the transparent top should be
gripped by its longer sides
and gently pulled off the button.
Testing and Operation
Connect a test number to an address in the translator. Ensure
that the power supply and
the ON/OFF switch on the Key Unit are both ON. The left-hand
lamp on the Key Unit should
Check the telephone instrument can be used in the normal manner.
Operate the appropriate address button and check the following:-
(a) Ensure the address button locks down.
(b) The right hand lamp on the Key Unit glows (green).
(c) When pulsing has ceased the supervisory tones should be
heard on the monitor amplifier
loudspeaker. (To adjust the level see para g).
(d) When the handset of the telephone is lifted, the address
button should release, the
right hand lamp cease to glow and the monitor amplifier should
Conversation may now proceed.
Replace the handset and check the cancel button as follows:-
(e) Re-operate the address button and ensure that, when the
cancel button is operated, the
To check the time-out circuit proceed as follows:-
(f) Repeat (a), (b) and (c).
(g) Wait for approximately 60 seconds after the end of dialling
without lifting the
telephone handset. The call should then automatically release.
When the checks have been
made remove the test number and connect the addresses required
by the subscriber.
It should be noted that when the autodial is connected to an
extension plan and a call has
been originated by the autodial, the lifting of an extension
telephone handset will cause
the autodial to release.
Monitor Amplifier Volume Control
It should be ensured during testing that the signals in the
monitor amplifier loudspeaker
are at a satisfactory level for the subscriber. If necessary the
level may be adjusted by
a variable resistor (RV7) situated in the translator on the
lower printed circuit board
below terminals 35 and 36. When the volume has been adjusted to
a satisfactory level the
translator terminal cover must be replaced.
Wiring details are shown in Diagram N 2310.
Diagram SA 9199 shows the circuitry of the Autodial and Diagram
Notes SA 9199 explain the
The bulbs are Lamps No. 41B.
Extract from an article on Repertory diallers in the POEEJ, Vol
62, page 188,
T. G. SIMMONDS, B.SC., and P. A. BURTON
Repertory diallers enable an individually selected variety of
national or international calls to be set up automatically by a
simple operation, such as the pressing of a button. Three types
are described which use three fundamentally different methods of
information storage. All give a considerable time and effort
saving over the conventional dial.
A repertory dialler is a device which can be
programmed with a repertoire of telephone numbers, so that by a
simple operation the user can cause a selected number to be
About thirty-years ago the Post Office introduced the Autodials
No. 1 and No. 2, which were mechanical repertory diallers, the
digits of the telephone number being represented by teeth on a
brass disc. To dial a number, pulsing contacts were positioned
so that they were operated by the teeth when the disc rotated.
For various reasons the production of autodials was
In recent years there has been a revival of interest in
repertory diallers and the Post Office has been studying the
market requirements of three categories of dialler. For
marketing purposes these three types are known as the Key
Callmaker, Tape Callmaker and Card Callmaker. Engineering titles
are Autodial 100 series, Autodial 200 series and Autodial 300
series, respectively. The Post Office has sponsored the
development of the key and card
callmakers and purchased a quantity of tape callmakers for
market trials. The three autodials are described briefly below.
The Autodial No. l0lA is an executive-style instrument,
giving access to any one of 32 telephone numbers at the press of
a button. A simple amplifier and loudspeaker are provided to
monitor the progress of a call, so that the handset of the
associated telephone instrument need only be lifted for
conversation when the call has matured. The
dialler comprises a desk tablet, the Key Unit No. 1A, which
measures 9 in x 7.5 in x
3.5 in high, and a wall-mounted unit, the Translator No. 1A,
with an associated mains-driven power unit.
The Key Unit No. 1A houses the 32 address buttons, arranged in
four columns of eight, and a further button for cancelling
calls. The buttons have a face area of 1.25 in x
0.3 in and each is provided with a paper designation label
protected by a transparent-plastic cap. Each button has a single
sealed make contact which is operated by the movement of a
permanent magnet. Once depressed, an address button is locked
down by a solenoid to hold the contact made for as long as the
autodial is controlling the call. Located in front of the
address buttons, beside the cancel button, is a miniature
loudspeaker for the monitor facility. On the other side of the
cancel button are two warning lamps. One is lit when the
autodial is operational, the other when a call is being dialled
The Translator No. 1A, which should be mounted in
a discrete but accessible position, contains the
telephone-address translation field and all the electronic
circuitry. The translation field
(shown to the right) has 32 groups of 13 tags, one group
associated with each address button. The first tag of each group
is labelled ACCESS and the other tags are labelled
Between the two columns of tag groups are 14 slotted bars
representing digit values
1-0, EXCHANGE, ISD, STOP, and a spare bar which can be cross
connected to any other bar to give extra connexion capacity.
Wire jumpers, 44 in long, with crimped connectors, are used to
connect the tags to the bars. The jumpers are supplied in four
colours, red, white, blue and black, to assist identification if
number changes are required.
To programme a telephone number, tag 1 of the chosen address
group is jumpered to the digit bar corresponding to the first
digit of the telephone number, tag 2 to the bar corresponding to
the second digit, and similarly for the other digits. After the
last digit has been connected, the next free tag is jumpered to
the STOP bar, to provide an end-of-number signal.
Public-network calls from p.a.b.x. extensions are normally
obtained by dialling 9 to gain access to the public exchange. On
receipt of dial tone the remainder of the number is dialled. By
jumpering the ACCESS tag of an address to the EXCHANGE bar, the
autodial can be programmed to dial 9, pause for two seconds and
then transmit the telephone number.
When an international number is required, the international
access code 010 (or 9010 from a p.a.b.x. extension) is set up by
jumpering the appropriate ACCESS tag to the ISD bar, the
remainder of the number being connected as before.
The autodial is designed to be connected between the
incoming line and the telephone installation, and is therefore
provided with independent pulsing and line-hold circuits
(see diagram below). Because the autodial is connected to a line
rather than a telephone instrument, it is not suitable for
connexion to certain installations, such as p.b.x. switchboards.
The pulsing-relay contact is a mercury-wetted reed with a
standard spark quench. During dialling the telephone line is
short-circuited behind the pulsing contact by the mask-relay
contact. At the end of dialling this releases and allows the
monitor amplifiers and loudspeaker to reproduce supervisory
tones and called-subscriber answer. The monitor amplifier is
provided with automatic gain control so that tones in the level
-30 dBm +6 dBm can be reproduced.
Outline Circuit Operation
As an example, assume address No. 4 has been programmed
with the local director number 246 8071. To call this number the
user presses button 4 which triggers the control circuit and
selects the address. Immediately, the control circuit returns a
potential to the key unit which energizes a
solenoid and locks the button down. Further signals from the
control circuit operate the mask relay which loops the line
ready for pulsing, and connect the monitor amplifier behind the
After a two-second pause to allow for the seizure of the
exchange equipment, the pulse generator is allowed to free run
l0p.p.s. As each pulse is sent to line the pulse counter is
stepped on until coincidence occurs with the value programmed
for the first digit; a signal is then forwarded from the
coincidence circuit to the inter-digital pause (i.d.p.)
generator to give an 800 ms pause and to clamp the pulse
generator. In the example, the value of the first digit is 2. A
further signal Steps Oil the address-code selector so that the
second digit, 4 in the example, is presented to the coincidence
circuit. At the end of the 800 ms pause the pulse generator
again free runs at
l0p.p.s. until the pulse counter has counted four pulses, when
coincidence again occurs. The process is repeated until the
address-code selector steps to the eighth digit. The eighth
digit tag has been jumpered to the STOP bar. The pulse generator
is therefore clamped and the mask relay is released, removing
the short-circuit from the input to the monitor amplifier so
that supervisory tones and the called subscriber’s answer can be
heard. When the handset of the associated telephone instrument
is lifted, the line current through the telephone circuit is
detected, and the monitor amplifier is released from the line,
leaving the call under the control of the telephone. If the
telephone handset is not lifted within one minute after the end
of dialling, the time-out circuit releases the call and restores
the autodial to the standby state.
When a call to an international number is initiated, the
ISD-code selector is activated to cause the prefix-code 010
to be transmitted. The ISD-code selector has a two-stage binary
counter which controls the prefix digit-sequence.
The values of the digits are determined by the coincidence
circuit as for national-number digits. The use of a special
ISD-code selector reduces the number of digit tags by three for
each address, and associated components by 3 resistors and 1
diode per tag. Elements in the address-code selector which would
be required to select digits 13, 14, and 15 are also not