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DHEI Connector Signals (Ref 10)
Pin #
Signal Name
1
RSVD
2
RSVD
3
RSVD
4
RSVD
5
SIGND
DHEI Connector LED Indicators
LED name
LOOP
Meaning
ACT
Basic System Setup Diagram
Programs are selected and mapped by the user. A check box is provided on the Pidsets Config page of the web interface to
select programs for the output. A box is provided for assigning the program number, and a combo box allows the user to
select AC-3, MPEG, or both types of audio for inclusion in the output transport stream. PID assignments are passed to the
output without change.
WARNING: Do not select IRT mode unless using the DTV720 with Motorola or General Instruments equipment. Using IRT
mode in other situations may have unexpected results.
With systems using the Motorola IRT product, certain additional elements must be included in the output transport stream. In
such systems, be sure to enable the DTV 720's IRT Mode by selecting IRT Mode ON from the web browser interface or front
panel. When the IRT Mode is on, the DTV720 performs the actions listed here.
•
A CAT (Conditional Access Table) PID (0x0001) is included and a CA system descriptor is added in this packet
pointing to a reserved location (PID 0x0ff9) for the EMM (Encryption Management Message).
•
For each program in the stream, a CA descriptor pointing to itself is added in the PMT. This is a null ECM
(Encryption Control Message).
•
To the PAT, Program 0 (NIT) is added, pointing to PID 0x0ffe which carries the STT (System Time Table) clock
information.
•
The NIT (Network Information Table) must also be present in the transport stream. This PID (0x0ffe) is created at
the uplink and is passed through.
800043-02 Rev. A
Pin #
Signal Name
6
SENSEOL
11
7
PSYNCO+
12
8
PDATAO+
13
9
PCLKO+
14
10
REFCLKO+
15
DHEI cable is fully connected to modulator
Always on except in catastrophic failure
Program and PID Mapping
Pin #
Signal Name
SENSEOR
PSYNCO-
PDATAO-
PCLKO-
REFCLKO-
IRT Mode
Page 2 of 6
July 21, 2004
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