||React 320 Plus
320 Plus (5025 AR) and React 220 (5014 AR) are similar in appearance to React 320
The BT React range of Telephones are intended for retail only.
The range comprises five models:-
- Tele 5012 AR - React
- Tele 5013 AR - React 120
- Tele 5014 AR - React 220
- Tele 5015 AR - React 320
- Tele 5025 AR - React 320 Plus
They are all similar in outline and offer the following facilities:-
- LD or MF4 signalling (customer switchable) and mixed signalling
- Earth-Loop or Timed-Break recall (customer switchable)
- 32 Digit Last-number redial memory
- Tonecaller with two level volume control and off position
- Secrecy, microphone cut-off button (latching facility on teles 5015 AR & 5025 AR
- 20 Address memory buttons (all models except tele 5012 AR and 5025 AR), each address can
store up to 16 digits including and # codes but not Earth recall. Tele 5025 AR has 38
Address memory buttons 1 - 19 can each store 2 numbers, accessed by button 20 used as a
- For table or wall mounted use, when used wall mounted, the case moulding below the
plunger should be reversed to provide a handset retaining lug and the wedge shaped base
bracket turned round to allow the telephone to rest against the wall at a slight angle.
- Excess line cord may be stowed in wedge shaped base bracket
- LCD display of time, call timer, dialled digits and stored numbers (5014 AR, 5015 AR and
5025 AR only)
- Handsfree LST facilities (5015 AR and 5025 AR only)
A three position slider switch (marked LD-MFT-MFE) is provided on the side of the
instrument. As supplied this is normally set to LD to offer Loop Disconnect signalling
with Earth-Loop recall but may be adjusted to offer MF signalling with Timed Break recall
(MFT) or MF signalling with Earth-Loop recall (MFE) as required.
Mixed Signalling is the facility whereby a call may be originated in the Loop Disconnect
mode and continued for the duration of the call in the MF4 mode by pressing the 'MF'
button, to access certain network based facilities (e.g. Voicebank, Display page, Home
banking). There will be a slight delay before subsequently keyed digits are transmitted in
MF in all 'React' telephones.
There is no provision for storing PBX access pauses in the last number redial store of the
5012 AR, hence last number redial facility on this telephone will not work on external
calls on PBXs that require access pause.
PBX pauses may be stored in last number redial and stored number stores by pressing the
'Pause' button on the 5013 AR, 5014 AR and 5015 AR models only.
Made by Inventa (Malaysia)
Distributed exclusively by British Telecom
React telephones are approved for use on DELs and as extensions to PBXs in categories
1,3,5 & 7 under the following approval numbers:-
5012 AR S/2981/3/J/501122
5013 AR S/2981/3/J/501123
5014 AR S/2981/3/J/501124
5015/25 AR S/2981/3/J/501121
Modifications which have not received appropriate approval must not be carried out as to
do so would invalidate approval, making connection unlawful. Prestel RADAR database (page
54031) details those PABX equipment's to which the telephones may be connected as
React telephones have a REN of 1.
React 320/320 Plus Handsfree facility should operate acceptably on line power in the
majority of situations.
When used on DELs where line current is below 40mA or on PBXs with constant current feeds
below 25mA (see below), LST volume and clarity may be improved by the use of a 'Telephone
Adaptor 20S' (Mains power unit requiring a plug with 2 Amp fuse).
Telephone Adaptor 20S (for React 320/320 Plus)
Most likely to be required with Consort, Renown, AESS/Senator.
May be required with Regent, Kinsman, Viceroy, TSX 50, Monarch, Minimaster 3. Not likely
to be required with Pentara, Escort, BTeX/SL1, SX 2000, MDX, Navigator.
New React telephones carry an 18 Month manufacturer's warranty to BT from the date of
manufacture as shown on the base of the instrument (year and week marking forming the
first four digits of the serial number). Customers will be given a 12 Month bring-back
DESCRIPTION BT Item Code
React Tele 5012 AR Alpine 877686
React Tele 5012 AR Ivory 877687
React 120 Tele 5013 AR Alpine 877689
React 220 Tele 5014 AR Alpine 877691
React 320 Tele 5015 AR Alpine 877693
React 320 Tele 5015 AR Black 877713
React 320 Plus Tele 5025 AR Alpine 877848
React 320 Plus Tele 5025 AR Black 877847
Telephone adaptor 20S 877694
Idle - Capacitor loop, React telephones draw-on-hook current to maintain stored number
memory (typically 5 micro Amps), this may give apparent low-loop line test conditions.
Seized - Normal off-hook press button telephone loop. The electronic keypad and
transmission circuitry may give 'high resistance' tele-loop line test conditions as with
other press button telephones.
ADDITIONAL INFORMATION Last number redial and stored number memories are
protected by 4 'AA' size Alkaline cells in the base of the telephone (3 cells in 320 Plus)
if the telephone is disconnected from line. There is no provision for batteries in Tele
Batteries should be changed annually and the telephone must be disconnected from line
whilst batteries are being replaced. Stored number memory cannot be guaranteed if
batteries are removed for more than 5 minutes whilst the telephone is disconnected from
All React telephones have good immunity against RFI from 50kHz to 10MHz.
Teles 5012 and 5013 have fairly good immunity above 10MHz, Teles 5014 and 5015 have poor
immunity above 10MHz.
BREATH PUFF DISTORTION
Investigations continue and it is recognised that 'Breath Puff Distortion' with React
range telephones is a subjective problem that only certain individuals in certain
circumstances come across.
The handset design with the flat inside surface can when used by some customers result in
the alignment of the mouthpiece and microphone being too close to the mouth and nose. This
in turn results in 'Breath Puff' noise of certain speech patterns being fed at distorted
levels back to the user. This sound is not transmitted down the line to the other party.
However, modifications made to the React 320 Plus greatly improve this models performance.
The way to deal with these occurrences is to:-
(a) Establish which individual users of the telephones have problems.
(b) Advise those users not to speak too closely to the mouthpiece as this will exaggerate
(c) If the user is still not satisfied, offer to change their telephone.
REACT 320 - DIALLING PROBLEMS IN HANDSFREE MODE
A problem has been found when (early model) REACT 320 is used in the following combination
Connected to a TXE4A Electronic or TXK3 Crossbar Exch,
Whilst dialling out in the Hands Free mode,
Telephone is set to LD (Loop Disconnect dialling).
This resulted in Dial Tone being returned or incomplete dialling even though the correct
number was displayed on the telephone.
No similar problems have been reported on any other types of public exchange or PBX and
the problem does not occur when the telephone is in the MF signalling mode (e.g. on
enhanced TXE4A exchanges).
TXK3 exchanges were only found in London, Birmingham, Manchester, Liverpool, Glasgow,
Edinburgh and Belfast and are rapidly being replaced. TXE4A exchanges are fairly
widespread and being enhanced to offer MF signalling.
React 320 models with serial number 88490015001 (available since January 1989) onwards
have been modified to overcome this problem.
REACT 120 - DELAYED SIGNALLING
The signalling processor in React 120 requires a short period (approx. 500ms) to power up
on handset pick-up or after earth recall is used. During this period any MF digits keyed
will be of low volume and may cause wrong numbers or incomplete sending.
This will occur with or without batteries fitted and only affects React 120 set to MF (no
problem when set to LD). Users reporting this problem should be advised to wait
momentarily until dial tone reaches full volume before starting to key any digits.
REACT 320 - POWER UNIT
CSI 183 advises that a power unit (Telephone Adaptor 25) may be required with REACT 320
telephones on DELs with Line Current below 40mA or on PBXs with Line Current below 25mA.
This is an in line mains power unit requiring the fitting of a suitable mains plug-top.
The following results of tests carried out by Martlesham with React 320 on various BT
switches are intended to enlarge on this.
Power Unit most likely to be required:
Consort, Renown, Ambassador & Senator 2-wire extensions.
Power Unit may be required:
Regent, Kinsman, Viceroy, TSX 50, Monarch, Minimaster 3.
Power Unit not likely to be required:
Pentara, Escort, BTeX/SLI, SX2000, MDX, Navigator.
REACT 320 USED AS POWER FAIL TELEPHONE
React 320 is not suitable for use as a 'Power Fail' drop-back terminal on earth calling
PBXs where the earth recall button is used to seize the exchange line under mains failure
This is because React 320 incorporates a semiconductor controlled Earth Recall circuit
which requires normal line conditions on both legs of the line.
Taken from BT Customer Service Information notes