Cisco Headend Digital Broadband Delivery System Guía De Instalación
Set Environment Variables (New Installs Only)
78-4036705-01 Rev D
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Set Environment Variables (New Installs Only)
The default settings for several important DTACS system variables may be
overwritten in the /export/home/dtacs/.profile file on the DTACS server. You must
verify, or set, the following environment variables in this file.
overwritten in the /export/home/dtacs/.profile file on the DTACS server. You must
verify, or set, the following environment variables in this file.
Notes:
You only need to complete this section if you are installing a new DTACS for the
first time. If you are upgrading an existing DTACS, you can skip this section.
first time. If you are upgrading an existing DTACS, you can skip this section.
The default values will be appropriate in most circumstances. Unless otherwise
directed, you should choose the default values during initial setup and adjust
them later, if necessary.
directed, you should choose the default values during initial setup and adjust
them later, if necessary.
Important: Whenever you change an environment variable in .profile, you must
then source the file. Type . /export/home/dtacs/.profile and press Enter. (Be sure to
type a space between the first . and /.) Then run the dtacsStop and dtacsStart
commands.
then source the file. Type . /export/home/dtacs/.profile and press Enter. (Be sure to
type a space between the first . and /.) Then run the dtacsStop and dtacsStart
commands.
Variable
Description
AMM_PERCENT_DATARATE
Used by ammDistributor to determine the
maximum bandwidth to use as a percentage of the
AMM IP stream datarate.
maximum bandwidth to use as a percentage of the
AMM IP stream datarate.
The default rate is 80% and the allowed range is 20
to 80 percent.
to 80 percent.
COMM_MULTICAST_TTL
Overrides the Time-To-Live for IP packets sent by
the dataPump.
the dataPump.
DTACS_SCP_OPERATION_MODE_
VALUE
VALUE
Overrides the setting of the SCP operations mode
when Full SCP or Fixed MPK features are enabled.
The variable must be set to a non zero decimal
value, otherwise it is ignored.
when Full SCP or Fixed MPK features are enabled.
The variable must be set to a non zero decimal
value, otherwise it is ignored.
For Full SCP mode, the default value is 0x90. For
Fixed MPK mode, the default value is 0x80.
Fixed MPK mode, the default value is 0x80.
IP_STREAMER_TTL
Overrides the Time-To-Live for IP packets sent by
dtacsIpStreamer. The default is 10.
dtacsIpStreamer. The default is 10.
NIT_MSG_RATE
(units ms)
(units ms)
Specifies the number of seconds between DTACS
system updates of the SCTE-65 Network
Information Table (NIT).
system updates of the SCTE-65 Network
Information Table (NIT).
The default value is 5000 ms, which is once every 5
seconds.
seconds.