
3-36 Programming Guide
Remote Data Transfer ESG Family Signal Generators
Data Transfer Troubleshooting
To solve this problem, add or subtract bits from the user file until it completely fills an
integer number of timeslots
“Multiple-of-8-Bits” Requirement For downloads to the binary memory catalog, user
file data must be downloaded in multiples of 8 bits, since SCPI specifies data in 8-bit bytes.
Therefore, if the original data pattern’s length is not a multiple of 8, you may need to:
• Add additional bits to complete the ASCII character
• replicate the data pattern to generate a continuously repeating pattern with no
discontinuity
• truncate the remaining bits
NOTE The “multiple-of-8-bits” data length requirement (for binary memory catalog
downloads) is in addition to the requirement of completely filling the data
field of an integer number of timeslots.
The following method can be used to compute the number of data pattern repetitions
required in order to form a continuous data stream.
In this example, a modified PN9, 511-bit data pattern is to be applied as the data source
for a 114-bit data field in a GSM Normal timeslot.
Set up a spreadsheet containing:
A = number of repetitions of the original data pattern
B = user file length = number of repetitions
× original data pattern length
C = Number of characters = user file length
÷ 8 (8 bits-per-character)
D = number of frames = user file length
÷ timeslot data field size (114)
E = total required PRAM = number of frames
× number of bits-per-frame (1250 for GSM)
Table 3-5 Data Pattern Repetitions for Continuous Data Stream
AB C D E
Number
of reps
Data
Pattern
Length ×
Repetitions
Number of
Characters
(B ÷ 8)
Number of frames needed to
end on a timeslot boundary
(B ÷ timeslot data field size)
Total PRAM required
(D × number of
bits-per-frame)
1 511 63.88 4.48 5,603.07
2 1,022 127.75 8.96 11,206.14
3 1,533 191.63 13.45 16,809.21
4 2,044 255.50 17.93 22,412.28
5 2,555 319.38 22.41 28,015.35
6 3,066 383.25 26.89 33,618.42
7 3,577 447.13 31.38 39,221.49
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