B
Appendix A • Cabling Specifications
APEX1000 All-Purpose Edge QAM Software Version 2.4.x • Installation and Operation Manual
285
573408-001-a
Notes:
1. Adjusting the RF Level such that it exceeds the nominal RF level when measured at
the APEX RF Connector may degrade RF performance.
2. For proper function of the internal RF Power Level detector, RF Outputs must be
TERMINATED with 75 Ohms. Unterminated RF Outputs may cause an RF Low Alarm to
be generated.
Alpha values for Annex A and B are as follows:
FEC Mode
Modulation
Mode
Alpha
Ch Spacing/
Symbol Rate
Typical Ch
Spacing
Typical
Symbol Rate
Annex A DVB
64 QAM 15% 1.15 8 MHz <6.952 Msps
Annex A DVB
256 QAM 15% 1.15 8 MHz <6.952 Msps
Annex B DCII
64 QAM 18% 1.18 6 MHz 5.06 Msps
Annex B DCII
256 QAM 12% 1.12 6 MHz 5.36 Msps
Annex C*
64 QAM 12% 1.12 6 MHz <5.31 Msps
Annex C*
256 QAM 12% 1.12 6 MHz <5.31 Msps
*Annex C specifies Alpha = 13%. The APEX utilizes 12% for Annex C, which results in a
QAM signal skirt bandwidth that is slightly below the normal value for Annex C.
Cabling Specifications
This section provides 10Base-T, 100Base-T, RS 232, and RF cabling specifications, as
well as a list of approved GigE SFP transceivers vendors.
Ethernet 10/100Base-T Interface Cabling
Item/Parameter Specification
Connector type
RJ-45 connector
Cable type
Shielded Twisted Pair CAT5
Maximum cable length
300 feet
Ethernet 10Base-T Interface Connector Pin Out
Pin Number Signal Direction Description
1
TX+ out transmit data +
2
TX– out transmit data –
3
RX+ in receive data +
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