OMNI S3

PXML No. 125
APPROVAL No. NS/2164/23/G/452434

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 S1S, S1 and S3 PABX (Private Automatic Branch Exchange) range 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 S3 cabinet to the right could hold 2 Periphery shelves (PEM's) and a control shelf (CEM).  The system could operate up to 8 PEM's.  The MDF would be mounted in a separate cabinet.

The standard attendant equipment comprises an attendant (operator's) console (normally a PC based console using 8086 processors), an attendant interface card (ATTI2) and an extension line card (SLUK).  These cards are located in the card shelf called a Peripheral Equipment Module (PEM).

A Busy Lamp Display Unit (BLDU) can also be provided, 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.

The Omni S3 was introduced into the UK in early 1986 and approved late 1986 under PXML No 110 (now PXML No 125), approval No NS/2164/23/G/452434.

The system is modular in design, starting with a single cabinet for the smallest configuration up to a maximum of four, each cabinet is identical in size. The system comprises equipment cabinets, operator's consoles, test jack frames (TJF) and power supply rectifiers and stand-by batteries (optional).

Each equipment cabinet comprises one CEM (Common Equipment Module) and two PEM's (Peripheral Equipment Module) or two CEM's and one PEM, or two PEM's or one PEM. The system can therefore be configured in SIMPLEX (one - CEM) or DUPLEX (two - CEM's) mode.

Technical Information

CAPACITIES
The theoretical maximum equipment values are:-

Maximum Number	     per PEM         fully configured (8 PEM's)
Extensions	        256	                2084
Trunks	                64	                512
Trunk Groups	        -                  	64
DASS2/DPNSS links	2                 	16
Consoles	        2	                16
Display Units	        4	                16
DTMF Receivers	        8	                64
8-Party Conference	2	                2
Serial Data Circuits
(TTY,VDU,Call Logger)	-	                2
MFC Receivers	        8	                64
Dial Tone Detectors	4	                32
Data Lines	        64	                512

There are theoretical maximums for each item assuming the other items are provided at some reduced level or not at all. The practical maximums will be dependant upon specific customer requirements.

OMNI S3
The theoretical maximum equipment values are:-

	                                        Maximum Number for a
				Maximum Number	fully configured
	Equipment		per PEM		system of 8 PEM

	Extensions		256		2084

	Trunks			64		512

	Trunk Groups		-		64

	Private digital links
	32 channel CEPT span	2		16

	Consoles		2		16

	Display Units		4		16

	DTMF Receivers		8		64

	8-Party Conference	2		2

	Serial Data Circuits
	(TTY,VDU,Call Logger)	-		2*

	MFC Receivers		8		64

	Dial Tone Detectors	4		32

	Data Lines		64		512


PARTS

Partial parts list
Description						Part code
PC CONSOLE PROCESSOR 8086				PROCESSOR 8086
PC CONSOLE KEYBOARD					EPSON MOD NO M7US01X
HARD DISK DRIVE (ST225)					EC071773A
+12V PWR SUPPLY CD					FB017165-A
COMPUTER BUS EXTEND					FB017214-A
PWR SUPERVISE TERM					FB020995-A
M502 CD							FB051383-A
PCM NETWORK CD						FB051394-A
POWER MONITOR CD					FB051395-A
128K MEMORY						FB051396-A
SYS STATUS DISPLAY					FB051397-A
FLOPPY DISC ASSEMBLY					EC022198A
HARD DISK ASS (ST412)					EC022199A
FAN PACK						EC071624A
ICPCM							FB051394-BOA
E&M SIGNAL CARD						EC004521-01
PEM S3 BACKPLANE					EC071614A
OSCI UNIT (PC CONSOLE)					HC001985-A
A5 REMOTE ALARM BOX					E08001A

THE S3 SHARES OTHER PARTS WITH THE OMNI S1 AND S1S

PARTS LIST

 
 
BACK Home page BT/GPO Telephones Search the Site Glossary of Telecom Terminology Quick Find All Telephone Systems

Last revised: September 25, 2021

FM