APPROVAL No. NS/2164/23/G/452433 (NTX30M) and NS/2164/23/G/452431
Made by Atea of Belgian and distributed in the UK by Ferranti GTE Ltd, then Ferranti
Business Communications, then Siemens, then GPT, then Siemens Gec Communication Systems Ltd and now Siemens. The system is known as the Omni S1 and S1S and was sold by Norton Telecom/GPT/Siemens
as the NTX30 and NTX30M (pictured with the telephone on top). The NTX30, NTX30M and S3 systems have now
been superseded by the Omni 200
range.The PABX's (Private Automatic Branch Exchange) are Electronic, Digital, Stored Program Controlled (SPC) employing Time Division Multiplexing (TDM) to establish connections and Pulse Code Modulation (PCM) for local voice transmission.
The standard attendant equipment comprises an attendant (operator's) console, an attendant interface card (ATTI2) and an extension line card (SLUK). These cards are located in the Peripheral Equipment Modules (PEM's).
The Omni supported numerous type of attendant consoles. Early switches used a Pacet (looked like a slug with a red LCD). Norton Telecoms marketed a screen based console called the Level 1. This was simple and was later developed into a directory and call logging screen based console called the Level 2. Level 2 consoles used a smart card for backing up directory and call logging set-up. The Level 3 console appeared in the early nineties and this was an enhanced Level 2 with a Disc Operating System and greater on board memory. The Level 3 console used floppy discs as a backup media for set-up, directory and call logging records.
A Busy Lamp Display Unit (BLDU) can also be provided on the Pacet only, as a separate unit, which fits on top of the console.
The PABX is designed such that a data option (D2) can be integrated into the system, to provide voice and data processing which are separated completely by using individual buses.
In the event of a power or major equipment failure predetermined extensions are connected to the Public Network. Since the extension instruments normally use time break recall and the exchange lines are normally earth calling these extensions will not be able to make outgoing public exchange calls in the by-pass emergency switching mode unless they are provided with earth recall telephones.
In the case of systems fitted with DDI lines these can be connected to a call answering machine in the by-pass emergency mode.
OMNI S1/NTX30
Introduced mid 1985 on an interim basis. The system was approved late 1996 under PXML No 109 (now PXML No 125) and approval number NS/2164/23/G/452431. The system comprises a single cabinet, operator's console(s) and test jack frame (TJF), to which the cables from the PABX are terminated.
The cabinet contains three files (shelf assemblies) for housing printed wiring cards:-
Power Supply Control file (10 slots)
Get Started file comprising a Common Equipment Module (CEM with 15 slots) plus a Peripheral Equipment Module (PEM0 with 21 slots). Early systems had quarter inch tape drives that were superseded by five and a quarter inch floppy disc drives.
An Expansion file which is a second Peripheral Equipment Module (PEM 1 with 36 slots).
Each PEM houses control cards and interface cards for extensions and trunks.
OMNI S1S/NTX30M
Introduced mid 1986 and approved late 1986 under PXML No 111 (now PXML No 125), approval No NS/2164/23/G/452433. The system comprises a single PABX cabinet, test jack frame (TJF) and optional operator's console for a system fitted with an integral AC power supply. A second cabinet is normally required for a system fitted with a DC/DC converter.
The PABX cabinet contains a power block, ringing generator and a shelf assembly with 36 card slots to house printed wiring cards. In addition, a floppy disk unit, a magnetic disk drive and battery pack can be provided as required.
printed wiring cards.
MAXIMUM CAPACITIES
The maximum (PEM 0 + PEM 1) capacity for each item listed is:-
328 extensions
92 trunks (exchange lines, DDI and private circuits) in 32 trunk groups.
1 - Private digital link (32 channel CEPT span)
4 - Operator's consoles
16 - DTMF receivers
2 - 8 party conference circuits
2 - serial data circuits (TTY, VDU, Call logger etc)*
16 - MFC receivers
8 - Dial Tone Detectors
64 - Data lines
For systems with only the GET STARTED (PEM0) configuration, the maximum number of extensions is 144 and 36 trunks.
The above are the theoretical maximums for each Item assuming the other items are provided at some reduced level or not at all. The practical maximums will vary depending upon specific customer requirements.
CONFIGURATIONS
Get Started (PEM0)
