Drake EH24A/EH24A ASI - Manual (Page 20)

20 Additional Information
ADDITIONAL INFORMATION
STANDBY MODE
The EH24A has a standby output mode which turns off the RF output. This can be used when it is desirable to temporarily disable the
output without unplugging the AC line cord. Select DISABLED in the ‘QAM MGT/VCT’ menu. Individual encoders can be disabled or
enabled when in the QAM mode from the ‘ENCODER xx’ menu.
OVER TEMPERATURE SENSOR
Temperature monitoring is built into this product. If inadequate ventilation is provided, overheating may occur. If this condition
is detected, the default LCD message will change to OVER TEMP. If this occurs, the problem should be corrected as soon
as possible. The unit will remain operational but the ventilation must be restored to prevent premature part failures due to
overheating.
STATUS DISPLAYS
When the units are not in the program mode, status displays are shown. The default display shows the QAM OUTPUT Mbits/S. When
the UP button is pressed, the version number of the EH24A firmware is displayed. The DOWN button toggles the display between
QAM OUTPUT Mbits/S and ASI OUTPUT Mbits/S.
REMOTE CONTROL AND MONITORING
The EH24A may be used with the 'Drake Digital Headend Remote Control Software' program to allow remote monitoring or control.
Only version 3.0 or newer version of the software is compatible with the EH24A. Connect the Ethernet cable coming from the PC or
modem to the Ethernet IN port rear panel connector. Assign a UNIT ID (1 to 63) to use the remote program. Leave at, or set to, 0 if no
remote access is desired.
EAS CONSIDERATIONS
Any headend using EAS and/or DTAs that includes more than one EH24A must be setup with one EH24A being the Master and all
other EH24As being Slaves.
These setups require different configurations of the EH24A with the SDE24EAS and ASII plug in modules.
-If set as a Slave Unit, Module 6 must always be an ASII module.
-If set as the Master unit, then there are 4 possible configurations for what needs to be plugged into the Module 6
and the Module 5 slots.
DTA MODE
DISABLED
EAS MODE
SCTE 18
Module 6 Plug-in
SDE24/SDE24A or empty
Module 5 Plug-in
SDE24/SDE24A or empty
DISABLED MODULE 6 SDE24EAS SDE24/SDE24A or empty
DISABLED MODULE 6 + SCTE 18 SDE24EAS SDE24/SDE24A or empty
ENABLED DISABLED or SCTE 18 ASII SDE24/SDE24A or empty
ENABLED MODULE 6 SDE24EAS ASII
ENABLED MODULE 6 + SCTE 18 SDE24EAS ASII
As shown above, if DTA MODE is ENABLED, then an ASII module must be present in the Master EH24A to receive the ASI stream from
the PC. Whether it is plugged into Module 5 or Module 6 slot depends on whether the SDE24EAS is also required in the system or not.
All units at the headend are then daisy-chained through ASI connections.
The Master unit’s ASI OUTPUT connector goes to the ASI INPUT connector of the ASII module in the first Slave unit.
The ASI LOOP output connector of the ASII module in the first Slave unit goes to the ASI INPUT connector of the ASI
module in the next slave unit.
These ASI LOOPs continue through all EH24As at the headend.
There can be standard SDE24/SDE24A's in some or all of the remaining slots of the Master EH24A. If they are wanted to be sent out on the
ASI output of the Master EH24A can be picked up from the ASI LOOP output connector of the ASII module of the last Slave unit in the
chain.
VERY IMPORTANT
: When the SDE24EAS is used in slot 6, both encoders in the SDE24EAS must be set to the lowest
encoding bitrate of any other SDE24/SDE24A in the entire system. This is the only way to make sure that when its stream replaces
the original streams that it will still fit into all the QAM channels.