Web GUI Monitoring & Control
4.7.3.5.3
User Packet Length (UPL)
The length of the user packet, corresponding to a particular ISI, expressed in bits. If the UPL is 0,
then the stream in question is not packetised.
4.7.3.5.4
Sync Byte
The value of the packet sync byte, corresponding to a particular ISI. This is only valid for
packetised streams.
4.7.3.5.5
MA Type
The value of the first byte of the DVB-S2 base-band header, corresponding to a particular ISI. This
byte contains the flags as described in Table 4.19.
Table 4.2: MA Type Flags
Bit Field
Name
Description
Value
Interpretation
7:6 TS/GS
Transport Stream Input or Generic
Stream Input
00 Generic
packetised
01 Generic
continuous
10 Reserved
11 Transport
5
SIS/MI
S
Single Input Stream or Multiple Input
Stream
0 Multiple
1 Single
4
CCM/A
CM
Constant Coding and Modulation or
Adaptive Coding and Modulation
0 ACM
(VCM)
1 CCM
3
ISSYI
Input Stream Synchronisation Indicator
0
ISSY field absent
1
ISSY field present
2 NPD
Null-packet
deletion
0 Inactive
1 Active
1:0
RO
Transmission roll-off factor
00
0.35
01 0.25
10 0.20
11 Reserved
4.7.3.5.6
Modcod
The modulation type and coding rate being used, corresponding to a particular ISI. In the case
of ACM, this may change dynamically.
4.7.3.5.7
Sort By
The rows in the table may be sorted by any of the columns described in Table 4.19, using the
drop-down box to select the sort parameter. By default, the rows are sorted by age.
4.7.3.5.8
Effects of Uncorrected Base-band Header Errors
Any un-correctable transmission errors can lead to apparently strange behaviour in the base-
band header statistics. Most commonly, spurious streams can appear. Such spurious streams
arise through sporadic corruption of the ISI value in the base-band header. Operation of the
system under such circumstances may lead to unexpected performance degradation.
4-20
SBD75e Series Demodulator Installation and Operation Manual