8.5
Ground Start Line Support
Description:
The multipurpose line board provides system interface for loop start lines, ground start lines,
and E and M tie lines. These are typically the three different line types that the central office
(CO) makes available for connection to the public switched network. With the ground start line
type, the DXP
Plus
momentarily grounds the ring lead to signal the CO to establish a
communications link for an outgoing call. When the CO detects this, it acknowledges by
momentarily grounding the tip lead. The DXP
Plus
responds by removing its ground
connection and bridging itself across the tip and ring leads. The CO then removes its ground
connection and returns dial tone to the DXP
Plus.
For an incoming call, the CO grounds the tip lead and places an alternating voltage on the ring
lead for the DXP
Plus
to sense. If you set the incoming alert signal to its ring optional setting,
the DXP
Plus
detects tip-lead ground and then causes its ring generator to generate ringing to
the station being called. If you set the incoming alert signal to its ring required setting, the DXP
Plus
waits until the CO applies the alternating voltage before the DXP
Plus
generates ringing to
the station. When a station answers the ringing, the circuit is completed as it is for outgoing
calls.
Because ground start lines are controlled at both ends, they are capable of a release supervision
that provides a sure means of determining when a distant party hangs up his or her telephone.
This is very important in applications where the system costs the calls. Also, since the
signalling protocol indicates which end requests the line, it helps prevent call collisions and
glare and thus is useful in applications where there is a high volume of incoming and outgoing
calls occurring on the same lines.
Ground start lines are standard protocol for remote networking and are useful for connecting the
DXP
Plus
to private branch exchange (PBX) equipment. For ground start lines to be
dependable, you must ensure that you have connected the DXP
Plus
to a low
telephone
company ground.
NOTE: The Federal Communications Commission (FCC) requires that you inform the central
that the DXP Plus
is configured as an MF (multipurpose) registered device if you
connect it to ground start lines.
With ground start lines, set the following feature parameters:
Incoming Alert Signal
•I For
reauired, the DXP
Plus
must detect a ring signal on the line before it will send a
ring signal to a station. This method is normally used with systems that use synchronized
ringing to prevent a long first ring.
For
ontional, the DXP
Plus
sends a ring signal to a station
as soon as it detects a
ground on the tip lead of the line (put there by the calling equipment) or when it detects a
ring signal on the line. This method allows the station to receive a ring signal in less time
than the ring required method does; however, phantom ringing can occur on poorly
grounded lines or lines that fail from the CO.
Dialing Mode
Toll Groups
Busy Lead
voice mail ID
Incoming Alert Signal
DTMF Level
Caller ID Active
Line Group
Programming:
Refer to
Section 8.5. I.
Line Features Programming 8-21
Содержание DXP Plus Series
Страница 1: ...Digital Communications System R ...
Страница 363: ...Automatic Call Distributor Technical Manual R QuickQ DXP ...
Страница 424: ...Automatic Call Distributor System Manager s Guide R QuickQ DXP ...
Страница 500: ...Wrap up Time 1 6 Wrapping Up A Call 4 3 Z Zoom Box A 2 GCA70 271 Index I 3 ...
Страница 628: ...Interconnecting The VMI X Installing And Programming For ExecuMail IMI89 206 Installing And Programming For ExecuMail 5 ...
Страница 677: ...Connecting The Equipment Installing And Programming The OPX X IMI89 209 Installing The OPX X 7 ...
Страница 728: ...DP I I I I and FX Series Digital Communications Systems Understanding The Visual Man Machine Interface COMDlA ...
Страница 1112: ...9 08 8 90 1 13 4 78 3 94 UNIS029 TAB003 PLS page 6 GCA40 130 DXP Plus General Description 11B Telephone Features ...