Sony SPP-M100, Руководство по обслуживанию

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3. Automatic hold release
• During an outside line hold, taking the telephone set con-
nected in parallel off-hook ends the outside line hold and re-
leases the outside line.
• Release detection
Base unit
• During a Line n
♣
hold, the parallel connection telephone off–
hook detection port is monitored constantly and when it is
determined to be high (off-hook detected), Line n
♣
is released,
the base Line n
♣
LED goes out, and the Line idle shift mes-
sage is transmitted.
• During Line n
♣
hold/Line n
♣
’ communication, the Line n
♣
idle shift message is transmitted during communication and
established with back and forth and a half protocol.
♣
(n=1 or 2)
Handset unit
• Reception of the Line idle shift message puts out the handset
Line LED.
Low decided Hight decided
480msec
480msec
H
L
PARA DET