352
Chapter 10, Signaling Encoder (AF Generator 2)
MPT 1327 Encoder
Control Channel
The Control Channel field allows you to enter the Control Channel number.
Radio units (RU) are programmed to look for control channel signaling on a
restricted set of radio channels, known as the hunt group. It is essential that the
channel number on which the Test Set transmits the control channel signaling
matches one of the channels in the RU’s hunt group. If there is not a match, no
communication will be possible.
The control channel is a four-digit decimal integer without leading zeros. It has
the range 0 through 1023, and its default value is 1.
Test Mode
The Test Mode field is used to select how the encoder is used for tests:
Selection
Description
Off
In this mode the signaling hardware is disabled and does not transmit
data.
Control
In this mode the signaling hardware is enabled and is retransmitting a
basic control channel structure as defined by the content of the filler
buffer. (Refer to "Forward Control Channel Message and Filler
Buffers" on page 354 for an explanation of the filler buffer). One or
more timeslots in the filler pattern can be overlaid by messages from
the control message buffer under control of the Send field.
Traffic
In this mode the signaling hardware is enabled. The filler pattern is
not transmitted. Single or multi-timeslot messages can be transmitted
from the traffic message buffer under the control of the Send field.
1200Hz
In this mode the signaling hardware is enabled and transmits a contin-
uous 1200 Hz tone (equivalent to an FFSK transmission of continu-
ous ones).
1800Hz
In this mode the signaling hardware is enabled and transmits a contin-
uous 1800 Hz tone (equivalent to an FFSK transmission of continu-
ous zeros).
Dotting
In this mode the signaling hardware is enabled and transmits alternat-
ing 1200 Hz and 1800 Hz tones (equivalent to an FFSK transmission
of alternating ones and zeros).
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