Ericsson MRS3000, Руководство по обслуживанию на месте, Страница: 133 / 159

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Uppgjord (även faktaansvarig om annan) - Prepared (also subject responsible if other) Nr - No.
KL/ECS/S/ML Magnus Lindahl MRS3000 Telephone interface version
Dokansv/Godk - Doc respons/Approved Kontr - Checked Datum - Date Rev File
KI/ECS/S/MLC 1997-01-14 E LZB 119 1661
TELE.DOC
Overview
From V3.0 of MRS3000 there exists a possibility to connect the rest of the system to the public
telephone network or a local telephone exchange. To this you need a CU210.
There exist to ways of establishing contact between a mobile and the telephone line, manual telephone
connection and automatic telephone connection. A manual telephone connection can be established on
any CU210, but an automatic telephone connection can be made only on a CU210 which has the
identity number 0. When neither manual nor automatic telephone connection has been chosen, the
CU210 functions as an ordinary CU200.
The only thing that differs is that the CU210 is able to function as a BFS master control unit,
see MRS3000 OVERVIEW.
MANUAL TELEPHONE CONNECTION
Whenever the CU210 is involved in a call it is possible to make a manual telephone connection. Just
press |Transfer| once. The telephone line will be connected and the display will show:
MANUAL TELE CONNECT
The operator is able to hear everything both from the telephone line and the radio in the CU210's built in
loudspeaker or the handset loudspeaker. The operator can break into the call by pressing PTT, and
what he says will be transmitted to both the radio and the telephone line. To disconnect the
telephone line , press |Transfer| again. Note that it isn't possible to disconnect the call without having
disconnected the telephone line first.
If the call should be disconnected from the LP200/210, due to maximum conversation time or silence
and no squelch for too long, the telephone line will be disconnected automatically.
Simplex and 2 wire operation
If the chosen channel is a simplex channel or a 2 wire connection to LP200/210 is used, the traffic has
to be simplex, i.e., speech in one direction at a time.
The direction is chosen by the CU210 with a so called VOX.
However, if personality enabled, the telephone operator can enable the VOX by dialling DTMF 7 and
disabling the VOX by dialling DTMF 8. If the VOX is disabled, PTT is immediately shut off.
In the case of a 2 wire connection, the operator at the CU can hear the telephone line LF only when the
transmission path from the telephone to the radio is open.