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TCD Siemens T-56 →
Teleprinter connection device 13
Anschlussgerät 13 (AG-13), also: T-13,
is a teleprinter connection device (TCD) for one or two
teletypewriters,
developed around 1966 by Siemens in Germany.
It can be used to connect a 4-wire single-current teleprinter to a 2-wire
leased line, or for two such machines in a test setup.
It is a versatile device that was used in practice to test almost every
aspect of a teleprinter. 1
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The device is housed in a metal enclosure that measures 247 × 180 × 164 mm
and weights 3.7 kg. All controls and connections are at the top panel,
which can be covered by a metal lid. The lid is held in place by two
spring-loaded locks.
The device is powered from the AC mains and is suitable for 125, 220
and 240V AC.
It has two circular sockets for connection of the teleprinter(s).
These accept 4-contact ADoS plugs,
also known as Walzenstecker.
Above these sockets are two regular (grounded) mains power sockets that
provide power for the two teleprinters.
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A meter is present to show the polarity of the line current, which can be
reversed with a switch (I/II).
By default the device is internally wired for 220V AC. For use in
Europe it is recommended to modify it for 240V AC, as the mains
voltage in continental Europe is currently closer to 240V.
More sophisticated line termination units, like the Siemens T-56,
were available for dial-up lines.
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Except for the 20 ms gap for the 'ready-for-dialling' signal.
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The image below provides a quick overview of the controls and connections
on the top surface of Anschlussgerät 13. At the left is a double banana-type
socket for connection of the 2-wire single-current leased line. The socket
becomes active as soon as the banana plugs are inserted.
At the right are two ADoS sockets
for connection of up to two 4-wire
single-current teleprinters, such as the Siemens T-100.
They become active as soon as a teleprinter plug is inserted.
Above the two ADoS sockets are two regular grounded mains power sockets
(common in continental Europe). They are switched by the device's mains
switch at the bottom right. The meter at the left shows the line current,
which can either be negative or positive, depending on switch I/II.
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The diagram below shows the two possible configurations in which the device
can be used. At the left is the line-connected setup. It allows one
4-wire single-current teleprinter (TP) to be connected
to a 2-wire telex line. There are no dialling or signalling facilities,
so it is not suitable for a dial-up telex line.
In this configuration the teleprinter can only be used on a 2-wire leased line.
The diagram at the right shows a local demonstration setup in which two 4-wire
single-current teleprinters (TP1, TP2) are interconnected.
In that case, the AG-13 provides the line current for both teleprinters,
so that the two machines can send messages to each other.
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Below is the circuit diagram of the device. At the bottom left is the
mains input. Once the device is switched on, the mains voltage is also
available on the two mains power outlets at the top left. The mains power
is fed to the transformer (TR1) of which the secondary side is rectified
and stabilised to deliver approximately 120V DC. This voltage is then
used, in combination with R4 and R5 to create an adjustable constant current
source between 20 and 60 mA — adjustable with R5.
At the right are the connectors for the two teleprinters and the 2-wire
leased line, all of which are optional.
The transmitter contact and receive relay of the connected teleprinter are
connected in series by means of the b/w2 wires.
When a socket is unused, the normally-closed switch (S3, S4 and S5)
will keep the current loop closed.
As soon as a device (or the leased line) is plugged in, the switch
breaks the loop and the current flows through the device and/or the line.
All plugged-in devices are connected in series.
As the AG-13 is a single-current device, the meter (M1) will show either
a negative or a positive current, depending on the setting of the I/II
selector (S2).
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Note that by default, the device is wired for a mains voltage of 220V,
which is not appropriate for Europe today. It is advised to
wire the device for 240V by desoldering the wire (b2) and refitting it at (b1),
as indicated with dashed lines in the circuit diagram above.
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Device Teleprinter connection device (TCD) Purpose Connection of teleprinter to single-current line,
Testing of two teleprinters in a local setup Model AG-13, T-13 Manufacturer Siemens Year 1966 NSN 6625-12-124-1633 Order nr. S22229-P13-A1 Standard TW-39 Wiring 2-wire line, 4-wire teleprinters Current Single-current Power 220V, 240V, 125V AC/50Hz Output 120V DC Current 20 to 60 mA (adjustable) Harmonics < 1% Dimensions 247 × 146 × 180 mm Weight 3.7 kg
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- Anschlussgerät 13
- AG-13
- T13
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© Crypto Museum. Created: Friday 30 August 2024. Last changed: Thursday, 05 September 2024 - 09:29 CET.
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