Quantum and Evolution Series Installation and Operating Handbook
7-110
7.3.3.3.2 Edit-Unit-Interface Menu
This menu contains the following options:
•
Terrestrial.
This allows the selection of the terrestrial interface that is routed through to
the main traffic channel of the modem.
•
RF.
This option is used to set the RF port impedance.
•
ESC.
This selects the ESC port electrical interface. Note that the modem back panel
Async ESC connector provides either a high-rate asynchronous ESC interface for
IBS/SMS and Closed Network plus ESC overhead channel data, or it provides the
Aux function described below. When an IDR option card is fitted then the back panel
shared Async ESC port is disabled and the IDR card provides separate ESC and Aux
ports.
•
Aux.
This selects the Aux port electrical interface. This interface on the modem
provides the IBS/SMS low-rate Intelsat oversampled ESC facility. As stated above,
the ESC and Aux functions are mutually exclusive unless an IDR card is fitted. If an
IDR card is fitted then the Aux port can provide 32 or 64kbps access to the IDR
overhead in place of one or both of the IDR 32kbps ADPCM audio ESC channels, or it
can provide either the IBS/SMS low-rate Intelsat oversampled ESC facility or a higher
rate synchronous channel within the IBS/SMS overhead.
Edit-Unit-Interface-Terrestrial Screen
Options:
RS422
Available at data rates of up to 10Mbps.
LVDS
Available at all data rates.
1:Terrestrial 2:RF
3: ESC 4:Aux
Terrestrial interface type:
[RS422]
New:
RS422
