JSD TestPhone 295B User manual

JSD TestPhone Ltd
Unit E2
Formal Industrial Estate
Treswithian
Cornwall
TR14 0PY
[e-mail]
www.jsdtestphone.com
OPERATION MANUAL
TestPhone 295B
Issue 2.04; 3/5/2012
Main Features:
Digital Line Compatible (Integral ADSL Filter)
Tone/Pulse Dial Selection with Indication
Ultra Hi-Z on/off-hook Line Polarity Indication
Hi-Z Monitoring
Ultra Low Line Current with Over Current Protection
Three Ringer Melody’s ( 3 x 3- Tone)
Five Level Volume Control
Microphone Mute
12 x 21 Digit Memories
Quick Change Battery
Quick Change Cords or RJ11 Lead
High Impact Resistance
Fully Sealed to IP67
CE & Rohs Approved
Rugged Belt Clip
Two Year Warranty

Introduction
The Testphone 295B is a test telephone designed for use on
Public Switched Telephone Networks (PSTN). It is designed
for use on both Dual-tone Multi-frequency (DTMF - tone
dialling) and Loop Disconnect (LD - pulse dialling) lines. Fitted
with an integral ADSL filter, the telephone will not cause
interference when connected to ADSL/Broadband lines in
either `on hook` or `off hook` mode.
Dialling
`DTMF` dialling
To dial out press the [HK TN] button located on the underside of the
handset. Then enter a telephone number, press [LNR] to redial or
dial a pre-stored number from memory and conduct a vocal call
upon connection.
When `off hook` the relative polarity will be indicated - Green LED
positive polarity on Line A, Red LED positive polarity on Line B.
This mode is indicated by the `PL/TN` LED being Green.
`LD` dialling
To dial out press [HK PL] and proceed as above.
The revised state will be indicated by the
`PL/TN` LED being Red.
Terminating A Call
To terminate a call press either [HK TN]
or [HK PL]. Should the call not be
manually terminated it will automatically
be terminated after 30 minutes.
Volume Adjustment
During a call the receive volume can be
varied by pressing [V+] or [V-] as
required.
Mute
To mute the telephone during a call,
press [MUTE] A short burst of
confidence tone will be heard. While
Mute mode is in operation the `PG/
MT` LED will flash. To initiate
conversation, press [MUTE] again.
Last Number Redial (LNR)
Pressing [LNR] will initiate the last
number redial.

Timed Break Recall (TBR)
Pressing [TBR] will initiate a 100 millisecond timed break recall.
Earth Recall (ER)
Pressing [ER] will instigate an earth looped recall. This can only be carried out if the
telephone has an earth connection.
Incoming Ring
Incoming calls ring the internal tone caller. To answer the call press either the
[HK TN] or [HK PL].
Telephone Memory Store
The telephone has a 12 address memory store.
Note: Programming the memory locations can only be carried out when the
telephone is connected to an active telephone line.
To store a number:
 go `off hook` by pressing [HK TN] or [HK LD]
 press [PG] (yellow `PG/MT` LED will flash)
 press [MR] followed by the memory location [0]-[9], [] or [#]
 enter the required number (max 21 digits) on the numerical keypad (enter
pauses by pressing [LNR])
 press [PG] to store the number
 press [HK TN] to go ‘on hook’
To access the store:
 press [MR] followed by the store location [0]-[9], [] or [#]
Note: The unit should not be operated without a battery in place. To avoid
loss of memory the battery should be replaced while the telephone line is
connected. If used without a battery then errors will occur when used in `PL`
mode.
Polarity Indication
When `off hook` the relative polarity will be indicated - Green LED positive polarity
on Line A, Red LED positive polarity on Line B.
Monitoring
High Impedance monitoring is carried out by connecting the telephone to a line and
monitoring the line.
If `LNR` or `MR` retrieval becomes difficult,
it is likely that the battery needs replacing.

Field Repairs
Field repairs are limited to battery replacement or line cord replacement.
To replace the battery, with the telephone keypad uppermost remove the two
screws in the centre of the body and remove the top moulding. Using a suitable tool
remove the CR 2032 (or pattern) battery. Replacement is a reversal of this
operation.
To replace the line cord, additionally remove the two screws holding the line cord
in position, remove the existing line cord. Replacement is a reversal of this
operation.
Tone ringer (Melody/Volume)
The tone ringer melody repetition rate/volume may be configured as follows:
[PG] [#] [0] [PG] - Ringer off
[PG] [#] [1] [PG] - 1 time @ -16dB
[PG] [#] [2] [PG] - 1 time @ -7dB
[PG] [#] [3] [PG] - 1 time @ 0dB [max]
[PG] [#] [4] [PG] - 4 times @ -16dB
[PG] [#] [5] [PG] - 4 times @ -7dB
[PG] [#] [6] [PG] - 4 times @ 0dB [max. default]
[PG] [#] [7] [PG] - 10 times @ -16dB
[PG] [#] [8] [PG] - 10 times @ -7dB
[PG] [#] [9] [PG] - 10 times @ 0dB [max]
Connections
`PSTN` line - RJ11 [FCC4/4] socket and 3 terminals, identified as ‘LINE’.
Pin 1 - Line A; Pin 2 - Earth Recall; Pin 3 - NC; Pin 4 - Line B
Characteristics
DC Electrical Characteristics
PSTN idle current (on-hook) < 40uA @ 50Vline
PSTN operational current (off-hook) 13 –60mA nominal (60mA limited)
5 –13mA reduced performance
0 –5mA power-down
PSTN line protection 200V SAD + Dual 130mA PTC
Battery voltage 3V nominal (CR2032 type)
Battery supply current 5uA typical (no line connected)
AC Electrical Characteristics
PSTN transmit gain 36.6dB typical
PSTN transmit soft clip level 2V typical
PSTN transmit soft clip attach 30uS/6dB
PSTN transmit soft clip decay 20mS/6dB
PSTN transmit mute attenuation 60dB
PSTN receive gain 3dB typical
PSTN receive volume range -5.4/+8.1dB in 5 steps
PSTN receive soft clip level 1V typical
PSTN receive soft clip attach 30uS/6dB
PSTN receive soft clip decay 20mS/6dB
Default parameters
Earth Recall duration ER button press time
Auto on-hook timer 30 minutes
Button de-bounce time 20mS
Pulse [LD] Make period 33mS
Pulse [LD] Break period 66mS
Pulse [LD] dial rate 10pps
Inter-digit pause (Pulse[LD]) 790mS
Tone [DTMF] tone duration 82mS
Tone [DTMF] tone pause 82mS
TBR duration 101mS
Pause duration 2 S
Pre-digit pause (Pulse[LD]) 35mS
Post TBR pause 274mS
Line Loss Compensation (LLC) Off default, 20-50mA
DTMF level (low group) -4dBm
Tone [DTMF] comfort tone -30dBr
Operating Environment temperature -25°C - +70°C;
humidity up to 80% non-condensing
Dimensions 24.5 x 8.0 x 6.5 (cm)
Weight 414 (g)
Supplied by: