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Programming Guide 3-17
ESG Family Signal Generators Remote Data Transfer
User File Data Downloads
“multiple of 8 bits” and “enough PRAM memory” requirements to be correctly modulated.
For example, user file #1 contains 114 bits and fills the data fields of a normal GSM
timeslot, and user file #2 contains 148 bits for a custom GSM timeslot. In order to correctly
transmit these data patterns as continuously repeating user files without discontinuities,
both data patterns must be repeated four times. Therefore, user file #1 contains 456 bits,
and user file 2 contains 592 bits. Each user file will then create exactly four frames in
pattern RAM.
When two or more user files generate different numbers of complete frames, the user files
will repeat on different cycles. All user files will restart when the user file that generates
the largest number of frames repeats. For example, user file #1 needs four frames to
completely transmit its data, and user file #2 needs only three. User file #2 will repeat
after the third frame, and again when user file #1 repeats. See Figure3-3.. If these were
integer multiples of each other, both user files would be continuous, and user file #2 would
repeat after two frames.
Figure 3-3. Repeating Different Length User Files
PN9, PN15, and User File as Data Sources
If you select PN9 and/or PN15 to fill different timeslots without also selecting a user file,
each PN sequence is hardware-generated to fill its designated timeslot. No discontinuity of
the pseudorandom data occurs when the sequences are repeated.
When a PN sequence is selected to fill a timeslot and a user file is selected for another
timeslot, the PN sequence is firmware-generated. The PN sequence is generated similarly
to a user file.
During this process, PN9 sequences are handled differently than PN15.
A firmware-generated PN9 sequence always requires 511 frames to be continuous,
regardless of the selected TDMA format. If the user file generates fewer than 511 frames,
the user file will repeat as necessary to fill the data fields of the 511 frames. If the user file
fills more than 511 frames, the PN9 sequence will repeat after the 511th frame, and repeat
again when the user file repeats. In these cases, where the user file is not an integer
multiple of 511 frames, either the user file or PN9 will be discontinuous.
Because of its length, a PN15 sequence will always be discontinuous regardless of whether
a user file is selected for other timeslots, and regardless of the TDMA protocol selected.
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