Talk:System X (telephony)

DLSU to DLE
If it earlier had one name and later the other, or is sometimes called by either name, shouldn't the article use one name but mention the other? Jim.henderson (talk) 16:47, 3 December 2008 (UTC)

Also previously known as DPLE -Digital Principle (or Principal?) Local Exchange. There might be a need to list the various terms used. Terryhfs (talk) 21:03, 19 September 2009 (UTC)

Both of these acronyms are correct and used. A Local Switching Unit and a Local Exchange are the same thing.

Reliability?
"Many of the switches are now near to or over 20 years old, giving an idea of their reliability."

This statement makes no sense. What specific affliction affects telephone exchanges when they reach twenty years of age? Many subsystems have been upgraded or replaced over time, along with maintenance replacement of individual slide-in-units. Also, as a system with a degree of fault tolerance the definition of reliability must be better specified - does the article refer to faults that affect the service offered by the exchange or faults in tolerant subsystems or components where service is not affected?

Terryhfs (talk) 20:05, 19 September 2009 (UTC)

These systems were designed for 15 years service at a maximum, they're now reaching double that and only just starting to go wrong in earnest. It is a testament to their reliability that they've achieved this.

RMUX / ARMUX
There was a further stage of concentration that I believe never got past trial stage. I've seen both, served from Brighton Kemptown processor. The first was an RMUX - Remote Multiplexor. Installed in an external cabinet it contained line controllers and line cards. The second and later development was the ARMUX - Advanced Remote Multiplexor. This was installed at Sussex University and was a multi service rack that provided analogue, ISDN and digital private circuit connectivity. This system again had line controllers and line cards hosted remotely from the concentrator.

Terryhfs (talk) 20:11, 19 September 2009 (UTC)

PO CORAL
Doesn't make sense to describe PO CORAL as "a special real time version of CORAL 66" as CORAL 66 was always real time. The only thing that was special about PO CORAL was that it banned recursion and let you include assembler. (Not that we were supposed to, mind). HughesJohn (talk) 17:11, 10 February 2011 (UTC) (SIS, Plessey, Edge Lane, '82).