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Real-Time I/Q Baseband Generator User’s and Programming Guide
Softkey Reference
ESG Family Signal Generators
C
Options UN8 and 202
Configure Sync
In either the GSM or PHS format, pressing this softkey displays a
menu of softkeys where you can configure a synchronization timeslot.
In the GSM Format
The following figure shows an example of a synchronization timeslot as
it is defined by the GSM format.
•
T:
shows that both of the 3-bit tail fields are always hexadecimal
zero. The text in this field is grey, indicating that you cannot change
the contents of the tail bit fields.
•
E:
shows the contents (PN9) of the data selection (encryption bits)
for this timeslot. The
E
softkey makes this the active function. Other
selections include PN15, fixed 4-bit patterns, fixed patterns of ones
and zeroes, user files, or external data.
•
TS:
shows the contents (hexadecimal B962040F2D45761B) of the
64-bit training sequence for this timeslot. The
TS
softkey makes this
the active function.
•
G:
guard time appears in the visual representation of the timeslot
as an 8.25-bit field. In the actual implementation, the guard time
field in timeslots 0 and 4 are 9 bits long and the remaining timeslots
contain 8 bit fields. (This implementation is documented in the GSM
format “GSM REC. 05.10 Section 5.7” as follows: “Optionally, the BS
may use a timeslot length of 157 bit periods on timeslots with TN=0
and 4, and 156 bit periods on timeslots with TN=1, 2, 3, 5, 6, 7,
rather than 156.25 bit periods on all timeslots.”) The text in this field
is grey, indicating that you cannot change the contents of the guard
time field.
Summary of Contents for ESG series
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