BT NORSTAR COMPACT

PXML No. BABT/PXML/PBX.0080
APPROVAL No. BABT/PXML/PBX. 0080

Click for Compact plus

Click here for a guide on Norstar systems

Meridian Norstar Compact is a key telephone system with a maximum capacity of 6 exchange lines and 16 extensions, an 4 exchange line, 8 extension variant is available as a BT sales option.
The system consists of a wall mounted central control unit, box connection and three types of digital extension telephones (M7100, M7208 and M7310). A busy lamp field is available for connection to the M7310 telephone. Headset working is available on the M7208 and M7310 telephones. An Analogue Terminal Adaptor (ATA) is available to allow the connection of two wire analogue telephones, answering/ facsimile machines etc. A Station Auxiliary Power Supply (SAPS) is available which increases the normal extension line length.

To make an 8 extension Compact into a 16 extension model, an MDF cable is all that is needed.

Click here for M7000 series telephones

Made by Northern Telecom

APPROVAL STATUS
Approved as described in PXML BABT/PXML/3 PBX.0080 which is updated as further enhancements are approved.

Approved for direct connection to the PSTN using loop disconnect or MF signalling or by working as a (List A) subsidiary system (loop disconnect or MF signalling) connected to a (List C) PBX.

SOFTWARE
Software level REL 01 is approved for use with Norstar. It is provided on a cartridge which plugs into the CCU. The cartridge must not be removed/replaced with the system powered up.

A Functional Earth is only provided when earth recall is required.

Although extensions only require single pair cabling, multi-pair cabling should be used.

The single pair terminates on terminals 3 and 4 of a secondary Line Jack Unit (LJU).

The approval requirement for Norstar is that one power fail (master) LJU must be provided on systems with up to five exchange lines, a second LJU must be provided when all six exchange lines are provided.

A Station Auxiliary Power Supply (SAPS) can be fitted to the extension LJU which increases the extension line length from 300 to 790 metres.

Testing has shown the Compact to have very good immunity to mains interference. External filters (e.g. BT Protector Mains 2A & 4B, ONEAC) need not be fitted as standard.

Technical Specifications
Max Capacity: 6 exchange lines (MF or LD) + 16 extensions
Switching: Fully digital, non-blocking
Control: Stored program on up-gradable cassette
Private Circuit Cap: 2
Recall: Timed break or earth
Power Requirements: 240V AC/50Hz
Power Consumption: 35W
Operating Temp. Range: 0(inf)-50(inf)C
Humidity Range: 5%-95%
Dimensions:

Weight: CCU Box Connection: 5.25kg 2.0 kg

INSTALLATION
The central equipment should be sited to give free access at all times for maintenance.

Programming Records must be completed and the customer shown how to programme the system in ADMIN.
STARTUP : CONFIG : customer familiarisation on ADMIN.

To access programming
From at least a M7208 on a compact and a M7310 on a modular:

FEATURE
**
266344
266344 (default)

To default the system back to original configuration within five minutes of powering up the system dial:

FEATURE
**
7827887
266344 (default)

LJU WIRING

WARRANTY
BT receive an 18 month warranty from Northern Telecom from the date of manufacture.
The date of manufacture can be determined by the last four digits of the ten digit serial number in the form YYWW.

The warranty expiry date (with the exception of the Box Connection) can be determined by the first four digits of the six digit number on the left of the label in the form YYMMOO.

               Release Number                    BT Item Code
                      |                                |
                      01                 NORSTAR    I/C 376317
        NT Code --- NT7B01              TELE M7310 BEIGE --- BT Title
                    911200                             049020


Warranty        ite(YYMMOO)     Factory Code(O4)   Date of manufacture(YYWW)

e.g. The above item has a date of manufacture of the 20th Week 1990, and a warranty expiry date of the end of the 12th month of 1991.

BOX CONNECTION WARRANTY
The warranty status must be determined from the date of manufacture which is either:-

1) FOR UNITS MANUFACTURED PRIOR TO 1991

A three digit alpha-numeric code stamped on the rear of the unit adjacent to the Music on Hold and External paging equipment connectors.

The date of manufacture is coded as follows:-

The months of the year are coded as a letter from the 12 letter word "GROUNDSWITCH", where G represents January, R February, O March etc. The last two digits represent the year.

e.g The code T90 means that the item was manufactured in October 1990.

2) FOR UNITS MANUFACTURED AFTER 1990

The date of manufacture will be stamped on the rear of the plastics with the Month and Year e.g Jan 91.

KNOWN PROBLEMS

Trunk lines
These are polarity conscious.  If reversed then incoming calls will work as normal but outgoing calls will not receive dial tine and the call will fail.

MERIDIAN NORSTAR COMPACT PLUS
The BT Meridian Norstar Compact Plus is supplied as 0 lines and 16 key extensions. The CCU differs from the original Compact (see above) in that it has 2 slots for the installation of either 4 port analogue trunk cards (must be global type) or 8 channel BRI cards, which are switchable between ISDN2 lines and S0 extensions. A clock card is required when installing a BRI card into the compact (one per system). The Compact Plus also has an in-built Analogue Terminal Adaptor (ATA) within the CCU, this provides one analogue extension port for the connection of a two wire device such as a fax machine.

 PARTS LIST 

Norstar Compact

Last revised: June 17, 2025