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306 Agilent N518xA, E8663B, E44x8C, and E82x7D Signal Generators Programming Guide
Creating and Downloading User-Data Files
User File Data (Bit/Binary) Downloads (E4438C and E8267D)
Figure 8-2 Mapping User File Data to a Single Timeslot
NOTE Compliant with the GSM standard, which specifies 156.25-bit timeslots, the signal generator
uses 156-bit timeslots and adds an extra guard bit to every fourth timeslot.
For this protocol configuration, the signal generator’s firmware loads PRAM with the bits defined in
the following table. (These bits are part of the 32-bit word per frame bit.) The Pattern Reset bit, bit
7, is 0 for frame one and 1 for the last byte of frame two.
Frame Timeslot PRAM Word
Offset
Data Bits Burst Bits Pattern Reset Bit
1 0 0 -155 0/1 (don’t care) 0 (off) 0 (off)
1 1 (on) 156 - 311 set by GSM standard (42 bits) & first
114 bits of user file
1 (on) 0
1 2 312 - 467 0/1 (don’t care) 0 0
1 3 468 - 624 0/1 (don’t care) 0 0
1 4 625 - 780 0/1 (don’t care) 0 0
1 5 781 - 936 0/1 (don’t care) 0 0
1 6 937 - 1092 0/1 (don’t care) 0 0
1 7 1093 - 1249 0/1 (don’t care) 0 0
2 0 1250 - 1405 0/1 (don’t care) 0 0
2 1 (on) 1406 - 1561 set by GSM standard (42 bits) &
remaining bits of user file
1 (on) 0
2 2 through 6 1562 - 2342 0/1 (don’t care) 0 0 (off)
2 7 2343 - 2499 0/1 (don’t care) 0 1 (1 in offset
2499 only)