Ericsson MRS3000, Руководство по обслуживанию на месте

Страница: 137 / 159

Open information
DESCRIPTION
6 (6)
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
Automatic call
The automatic call, if personality enabled is transmitted when
•
Access code enabled and no access code is dialled or
•
No function code is dialled
The automatic call can be programmed to a fixed route or to automatic selection of a route. If the
automatic call is disabled and any of the three situations described above occur, the block tone will be
transmitted to the telephone and the phone will be hung up.
Connected call
When the initial tone call has been made, the LF between the radio and the telephone line will be
connected. The other CUs in the system will indicate LINE BUSY, and cannot break in.
The telephone operator can disconnect the call in two different ways:
•
By dialling a DTMF #. A DISCON telegram will be sent on the radio and the call is disconnected.
•
By dialling a DTMF * and five more digits. A WHC call will be transmitted. If it succeeds the call will
be disconnected.
A call is also disconnected if ten consecutive ring or busy tones are detected.
Call termination
Aside from the possibilities to disconnect a call mentioned above, the following conditions will also
cause a disconnect:
•
Maximum call time reached. This time is usually set to 5 minutes, but is a matter of personality
programming and may differ from system to system. Ten seconds before this time expires,
LP200/210 will start transmitting a warning tone.
•
Silence and no squelch for 30 seconds. This time is also personality programmable. Ten seconds
before this time expires, LP200/210 will start transmitting a warning tone.
No matter the disconnect condition, a block tone is always transmitted to the telephone line before
hanging up.
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.