|
PXML No. 125
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
finally Siemens. The system is known as the Omni S1 and S1S and was sold by Norton Telecom/GPT/Siemens
as the NTX30 (pictured at the back) and NTX30M (pictured to the left 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been superseded by the Omni 200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.
Originally the systems run on a Tape drive and then got
updated to 5.25" floppy discs.
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 systems used a
console called a Pacet (looked like a slug with a red LCD - shown
to the lower left in the picture on the right). 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 console 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 picture to the right shows a Omni S1. This
is an early version with a cartridge tape drive (lower centre). This
was replaced later with a 5.25" floppy disk device.
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.
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)
|
Extension |
Trunks |
DTMF Receivers |
Consoles |
|
96 |
8 |
4 |
1 |
|
80 |
12 |
4 |
1 |
|
64 |
16 |
4 |
1 |
Expansion (PEM1)
|
Extension |
Trunks |
DTMF Receivers |
Consoles |
|
152 |
12 |
4 |
0 |
|
136 |
20 |
4 |
0 |
|
112 |
24 |
4 |
1 |
Total (PEM0 + PEM1)
|
Extension |
Trunks |
DTMF Receivers |
Consoles |
|
248 |
20 |
8 |
1 |
|
232 |
28 |
8 |
1 |
|
176 |
40 |
8 |
2 |
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.
OMNI S1S
The maximum capacity for each item listed is:-
168 Extensions with the 8 circuit line card
256 Extensions with the 16 circuit line card
44 Trunks (exchange lines, DDI and private circuits) In 64
trunk groups.
2 Operator's Consoles
8 DTMF Receivers
2 - 8 Party Conference Circuits
2 Serial Data Circuits (TTY, VDU, Call Logger etc)
8 MFC Receivers
4 Dial Tone Detectors
44 Data Lines
The above are the theoretical maximums for each item assuming the other items are provided
at a reduced level or not at all.
The practical maximums will vary depending upon specific customer requirements.
Practical Configurations:
4 DTMF Receivers, 1 Console, 1 Tone Detector and 12 Alarm Relays.
Trunks/Extensions:
8/96; 12/80; 16/64 - using 8 circuit line cards.
8/192; l6/160; 16/128 - using 16 circuit line cards.
By connecting a V24 Splitter, then more than 2 devices can be connected up to a maximum
of 4, to any of the systems.
Technical Information
NTX30 Brochure
NTX30 and 30M Brochure
 PARTS LIST
|
