Conrad Compact DSP Test- Set Benutzerhandbuch Seite 4

D S P
igital ervices
OFF mode
In Europe most PSTN and PABX Analog telephone lines have a DC feed of between 24 and 66 volts.
The Digital Voltage alarm, a rapid clicking sound warns you if you are connected to a phone line which has
more than 70 v.
If the alarm sounds you have probably connected to a line carrying a large DC voltage, to power some
remote digital equipment. In most cases this will be an ISDN NT or pair gain remote unit. Do not attempt to
go off hook but switch to monitor mode, you should hear the characteristic hiss of digital signalling. This will
confirm that the line is not analog but digital. Now you know that extra care has to be taken with this line,
breaking shorting or connecting a normal telephone to this line will result in disruption to the customers
service.
High voltage off hook inhibit:
If you attempt to go into talk mode on a line that has a DC feed of more than 110v the tester will not loop
the line.
As well as protecting ISDN and pair gain services from disruption, DSP protects the tester from damage
due to it having to dissipate high power levels in talk mode. All DSP features work even if the battery is flat
or not fitted.
rotection (DSP)
Back Features
1. Headset socket
Plugging in a CVE headset will switch transmit / receive
(TALK mode) and receive (MON mode), from handset to
headset.
! For safety reasons use only headsets tested and approved
by Tempo Europe Limited.
2. Earpiece
Listen here in 'MON' and 'TALK' modes, when not using the
headset.
3. Mute
Press and hold for microphone mute in 'TALK' mode.
4. Volume control
The tester has three positions: LOW/MED/HIGH.
LOW is similar to a normal phone's level.
Acoustic shock protection works even in HIGH position.
5. Microphone
Talk here in 'TALK' mode, when not using the headset.
6. RJ11 lead socket
Pin 2: Ground; Pin 3: Tip; Pin 4: Ring
When Tip is positive with respect to Ring (normal polarity), the
green LED illuminates.
Lightning: To specification ITU K.17,20, 21 (1500 V).
Timed Break Recall Duration Switch located under Battery
2