S2 and/or TEML

d7666

Posts: 1,417

S2 and/or TEML Sept 30, 2009 15:22:14 GMT

Post by d7666 on Sept 30, 2009 15:22:14 GMT

Can anyone provide a brief overview of S2 and TEML ?

Despite me being a comms engineer by background (but originally from outside the rail industry) I know very little about either S2 or TEML. I know where S2 links are between systems I support - but these are merely one step (that I don't need to know about) between end systems (that I do need to know about).

Searching both internet and intranet provides me with nothing much.

I think I'm right in saying both S2 and TEML are bespoke ''protocols'' [/li][li] - S2 from Westinghouse, TEML from (?? GEC ?? SGS ??) - and both unique signalling and/or signals control.

What are they ... 2-wire ? 4-wire ? analogue ? digital ? Or some form of carrier for multplexed signals ? Range ?

[/li][li] Having written that I'm not even sure ''protocol'' is the right term - especially given the much general confusion over what RS232/422/485 are (i.e. not protocols).

--
Nick

Last Edit: Sept 30, 2009 15:23:09 GMT by d7666

Deleted
Deleted Member

Posts: 0

S2 and/or TEML Sept 30, 2009 18:44:10 GMT

Post by Deleted on Sept 30, 2009 18:44:10 GMT

i have a book at work on TEML they used it on the east london line is was known as TEML40 as the control lines to link shadwell ser and new cross and also whitechpel imr with new cross and also shoreditch imr and new cross. I never had it go wrong when i was a t/o at whitechapel so must of been a realible system but others might prove me wrong.

Tom
Administrator

Signalfel?

Posts: 4,196

S2 and/or TEML Sept 30, 2009 20:11:26 GMT

Post by Tom on Sept 30, 2009 20:11:26 GMT

I worked with it on the Bakerloo, but can't admit to knowing that much about it, other than it's a multiplexing system. It was originally an ML engineering product, then they became ABB, Adtranz and are now Bombardier.

Basically a 24v 5mA feed is taken across the various inputs into the DINP card, and the low wetting current was the one weak spot, as lever frame contacts had a tendency to develop 'dry blood' and go High Resistance.
Outputs come from the system, again at 24v DC from a ROUT card.

S2 was considered to be the better of the two, but had an even lower wetting current (2mA) which made the H/R problem worse. What I do know is the capacity of S2 is 512 inputs per two pairs.

Last Edit: Sept 30, 2009 20:12:33 GMT by Tom

I draw signals

coyote Posts: 91	S2 and/or TEML Oct 1, 2009 9:08:20 GMT Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by coyote on Oct 1, 2009 9:08:20 GMT TEML-40 Bakerloo Line and Aldgate only. TEML-41 East London Line. Serck Interfaces at Moorgate and Faringdon.

d7666 Posts: 1,417	S2 and/or TEML Oct 1, 2009 15:00:07 GMT Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by d7666 on Oct 1, 2009 15:00:07 GMT Thanks all for the replies so far, all informative stuff, knowledge exponetially increased already -- Nick

Post by d7666 on Sept 30, 2009 15:22:14 GMT

Post by Deleted on Sept 30, 2009 18:44:10 GMT

Post by Tom on Sept 30, 2009 20:11:26 GMT

Post by coyote on Oct 1, 2009 9:08:20 GMT

Post by d7666 on Oct 1, 2009 15:00:07 GMT