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SAMSUNG DCS 70
INSTALLATION MANUAL
The PRS hybrids should be fitted to all exchange lines where call diversion to the network
(transit connection) is being used to ensure that the lines are released at the end of the call.
Typical applications for transit connections are -
• For people who divert their station to a mobile phone when out of the office.
• For DISA applications where the A party dials into the system and then dials out on an
outgoing line, eg for making international calls out of business hours.
• For ACD and AA applications
The PRS hybrids are required when PSTN to PSTN line diversion or ISDN to PSTN line
diversion or PSTN to ISDN line diversion are being used. The only situation in which PRS
hybrids are not required is when both the incoming and outgoing exchange lines used for the
call diversion are ISDN. The PRS hybrids should be fitted to both the incoming and the
outgoing lines of the transit connection.
In addition, it must be arranged with carrier to provide Reversal On Idle (ROI) on all of the
exchange lines. The reversal is used to detect when either the incoming call or the outgoing
call clears down. Note that the carrier service Reversal On Answer (ROA) is not suitable
since the line reversals are only given to the A party (ie. only on outgoing calls).
The failure to fit PRS hybrids to the exchange lines and
arrange for ROI from the carrier may cause excessive phone
charges for the customer and lead to unnecessary exchange
line congestion when transit connections are used.
Note also that the DCS 70 does not provide any additional gain for diverted calls. It is
recommended that call diversion via the PSTN is not used where the DCS 70 is installed on
long lines susceptible to high loss. Call diversion to the network should be provided using
ISDN in this situation.
METER PULSE MPD HYBRIDS
Meter Pulse detection (MPD) hybrids may be fitted as an option to the 3TRK and 6TRK
cards.
The MPD hybrids are used to detect 12kHz meter pulses. The DCS 70 must be programmed
to detect the meter pulses. Refer MMC 414.
FITTING MPD & PRS HYBRIDS
Both the 3TRKD70, 6TRKD70, 4TRK24 and the 6TRK24 card have positions for a single
hybrid for each exchange line. The cards are supplied ready for use with MPD hybrids. i.e.
the hybrid sockets are connected to line via decoupling capacitors.
The sockets for the lines 1-3 hybrids are marked HYB4, HYB6 and HYB8 respectively on
the 3 TRKD70.
The sockets for the lines 1-4 hybrids are marked P101 through to P104 (P106) respectively
on the 4 TRK24 and 6TRK24 cards.
The sockets for the lines 1-6 hybrids are marked HYB1 to HYB6 respectively on the 6
TRKD70 card.
(see Figures 4-5 & 4-6).
WARNING.
Page 4-6
th
10
January, 2000
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