Unit Telegraph No. 55A

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M1ECY
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Unit Telegraph No. 55A

#1

Beitrag: # 14859Beitrag M1ECY »

A very long shot.

Has anyone here come across these before?

As far as I can tell they are for converting from the later UK PSTN type connection (Possible V.21) to Double Current.

Any information will be helpful
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Re: Unit Telegraph No. 55A

#2

Beitrag: # 14860Beitrag DF3OE »

Yes, it looks like something similar to our German (and Austrian) AGTs.
It looks like a double current to V.21 transverter/modem to use older DC machines
with the V.21 FSK network.
mfg
henning +++

925302 treu d - T1000Z (Hauptanschluss)
55571 fvler a - T100S
210911za hmb d - T150 (Werkstatt)
218308 test d - T1000S/LS (Werkstatt)
925333 =treu d (Minitelex Sanyo SF100) defekt
Fax G2/G3: 05176-9754481 (Sanyo SF100 Thermofax) defekt
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Re: Unit Telegraph No. 55A

#3

Beitrag: # 14861Beitrag M1ECY »

Handy, this might be a simpler way to get older machines onto the network if the V21 problem can be resolved.

I guess this will also need to be used without FSG, so perhaps a FW change will be needed
669089 Siemen G - T100S Online 24H
299709 Antosh G - Creed 444 - Double Current R + D (0800 - 2100) and a bit tempremental
459724 NC
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DF3OE
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Re: Unit Telegraph No. 55A

#4

Beitrag: # 14862Beitrag DF3OE »

Use of an FSG (dialling unit) is always the better solution.
I am unsure if the British DC machines have FSG functionality implemented.
Maybe you can find some old Telecomms technican who have knowledge and
perhaps even old manuals of that stuff.

I am working on the V.21 problem.
This weekend is a "long weekend" in Germany with two public holidays and
I will try to test the modified V.21 board.
mfg
henning +++

925302 treu d - T1000Z (Hauptanschluss)
55571 fvler a - T100S
210911za hmb d - T150 (Werkstatt)
218308 test d - T1000S/LS (Werkstatt)
925333 =treu d (Minitelex Sanyo SF100) defekt
Fax G2/G3: 05176-9754481 (Sanyo SF100 Thermofax) defekt
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Topic author
M1ECY
Rank 7
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Beiträge: 686
Registriert: Fr 11. Aug 2017, 13:13
Wohnort: Hitchin Hertfordshire, UK
Hauptanschluß: 669089

Re: Unit Telegraph No. 55A

#5

Beitrag: # 14863Beitrag M1ECY »

Hi Henning, really no rush, I have lots to do.

I am trying to find the correct manual for this device - it looks like this switches the power to the teleprinter as well, but I cannot be certain.

The Cheetah Plus has no provision for FSG type equipment - it just plugs into the phone line. Perhaps there is some kind of internal device - you dial from the keyboard, and the machine drops into standby after 20 mins idle time.
669089 Siemen G - T100S Online 24H
299709 Antosh G - Creed 444 - Double Current R + D (0800 - 2100) and a bit tempremental
459724 NC
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DF3OE
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Beiträge: 3067
Registriert: Di 7. Jun 2016, 09:45
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Re: Unit Telegraph No. 55A

#6

Beitrag: # 14864Beitrag DF3OE »

FSK (V.21/ED1000) line connection is like a direct point to point connection, no FSG functionality.
Signalling is made by switching the correct tones.
mfg
henning +++

925302 treu d - T1000Z (Hauptanschluss)
55571 fvler a - T100S
210911za hmb d - T150 (Werkstatt)
218308 test d - T1000S/LS (Werkstatt)
925333 =treu d (Minitelex Sanyo SF100) defekt
Fax G2/G3: 05176-9754481 (Sanyo SF100 Thermofax) defekt
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Topic author
M1ECY
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Beiträge: 686
Registriert: Fr 11. Aug 2017, 13:13
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Hauptanschluß: 669089

Re: Unit Telegraph No. 55A

#7

Beitrag: # 14865Beitrag M1ECY »

Ive taken a closer look inside the box - The mains connection to the machine is permanent.

So I think any switching is done from inside the teleprinter.

I have posted a query on the Telecommunications Heritage Croup website to see if anything is known about the actual operation of these systems.
669089 Siemen G - T100S Online 24H
299709 Antosh G - Creed 444 - Double Current R + D (0800 - 2100) and a bit tempremental
459724 NC
Benutzeravatar

Topic author
M1ECY
Rank 7
Rank 7
Beiträge: 686
Registriert: Fr 11. Aug 2017, 13:13
Wohnort: Hitchin Hertfordshire, UK
Hauptanschluß: 669089

Re: Unit Telegraph No. 55A

#8

Beitrag: # 14866Beitrag M1ECY »

I've just read the technical handbook and training notes I have for the Super Cheetah - there is no reference to the need for any form of "FSG" so I can only assume that the V.21 enabled machines do not work like that.

So I think in reality, these units are only to convert double current machines to V.21.

This means that the machine is powered all the time, but in standby mode, when a call is incoming, the change of state is signalled in the usual way of current reversal.
669089 Siemen G - T100S Online 24H
299709 Antosh G - Creed 444 - Double Current R + D (0800 - 2100) and a bit tempremental
459724 NC
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