OPERATION
3-4
Revised February 1997
Part No. 001-9750-005
3.3 OPERATING MODES
3.3.1 INTRODUCTION
Each selectable system can be programmed with
a unique set of transceiver operating parameters. One
of these parameters is the operating mode which can
be Multi-Net, LTR, or conventional. The type or types
of operation programmed is determined by the radio
equipment that is being accessed by that system. The
basic operating differences between these system
types are as follows.
3.3.2 MULTI-NET AND LTR MODES
The Multi-Net mode provides the most powerful
operating features. Features available only with Multi-
Net operation include Busy Queuing, Status Messages,
Auto-Registration, and special calls (see Sections 5.7
and 5.8).
The LTR mode of operation is similar to the
Multi-Net mode. The main difference is that the
preceding features are not available. The features that
are unique to LTR operation are described in Section
3.8. In both the Multi-Net and LTR modes, channel
selection and monitoring before transmitting are
performed automatically by the transceiver. Tele-
phone calls (if available) can be placed almost as
conveniently as with a standard telephone. Busy and
out-of-range conditions are indicated by special tones
and display messages.
3.3.3 CONVENTIONAL MODE
General
Selecting a conventional system selects a specific
radio channel, and selecting a group (if available)
selects the type of squelch control used on that channel
such as carrier or Call Guard tone (CTCSS) or digital
squelch. This selects the specific mobiles or group of
mobiles being called and which calls are received on
that channel.
Channel selection is performed manually by
selecting a system. Monitoring can be performed auto-
matically or manually (see next paragraph) When it is
performed automatically, a special tone and display
message indicate a busy condition. Otherwise, there
are no tones or display messages to indicate busy and
out-of-range conditions.
Monitoring Before Transmitting
If the Transmit Disable On Busy feature is
programmed (see Section 3.9.1), monitoring is
performed automatically. Otherwise, it is performed as
follows:
•
If not scanning, note if “BUSY” is being displayed.
If it is not, the channel is free and a message can be
transmitted.
•
If scanning, take the microphone off-hook to halt
scanning and enable the monitor mode (indicated by
“MON” in display). The monitor mode (see Section
3.9.3) can also be selected by the MON switch if
available. This mode disables any squelch control
features so that all messages are heard. If no
messages are heard, the channel is free and a
message can be transmitted. If the transceiver is
programmed to not detect an off-hook condition, the
MON switch or the Transmit Disable On Busy
feature must be used to perform monitoring.
3.3.4 MULTI-NET AND LTR SYSTEM/GROUPS
Systems
When the system is programmed for Multi-Net or
LTR operation, information such as home repeater, all
encode and decode ID codes, and call indicator and
horn alert operation is programmed. The ID codes can
be fixed priority, selectable, and block types. The
types of ID codes and the number of ID codes that can
be programmed in each category are as follows. Any
combination of codes can be programmed and all
codes can be different.
Decode (Receive)
Encode (Transmit)
Fixed Priority
2 (M-Net & LTR)
---
Selectable
11 (Multi-Net)
11 (Multi-Net)
10 (LTR)
10 (LTR)
Содержание Summit DM 975x
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