Installation manual

Windsor Installation Manual - Issue C
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50
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Windsor Modem Features
Call Attempts
Country UK NL IT FRA IRL BEL FIN SA AUS
Number of re-attempts 2 14 3 4 3 3 3 3 3
1st-2nd call attempt delay
(seconds)
7 7 7 8 7 7 7 7 7
subsequent call attempts
delay (seconds)
62 62 62 8 62 62 62 62 62
Windsor Modem Features
Exchange Voltage Monitoring
As a protection against a cut line or telephone line fault, the nominal supply voltage from the
telephone exchange is continuously monitored. The modem will detect a fault condition which
is present for more than approximately 5 seconds.
Windsor Modem Features
Line Current Sensing
If an attached telephone handset is in use, then a loss of line condition would normally be
reported. The Windsor modem, however, can differentiate between a handset in use and a
loss of line condition by sensing the line current. This allows the Windsor modem to share a
line with other equipment and still retain continuous line monitoring.
Windsor Modem Features
Line Blocked Detection
In some circumstances the exchange voltage may be present but no proceed indication (dial
tone) exists. For example;
• when the telephone exchange has removed outgoing service
• when an incoming caller has not released the line and effectively blocked outgoing
calls
• when an out of service tone is present
The Windsor Modem can periodically test for the line blocked condition. The Windsor modem
checks the line by looking for the dial tone, dialling the first digit of the first programmed
telephone numbers and ensuring that the dial tone is removed. Line block detection is a
control panel feature. The modem will only check the line condition when the appropriate
command is received from the panel.
Windsor Modem Features
Series Handset Disconnect
Provision has been made to allow for connection of up to three telephone handsets on the
same telephone line as the Windsor Modem. These handsets must be connected in series,
with the Windsor Modem the first apparatus connected to the master telephone socket.
Connection of the Windsor Modem and telephone handsets are made via connector CN1 on
the network side of the PCB and the protective cover moulding must be fitted after connection
to the PSTN.
When the handset(s) is disconnected there may be a delay, caused by the exchange, before
a dial tone is present.
Connecting handsets in any configuration other than the method stated above (such as
parallel connection) will invalidate national PTT approval.