Comtech EF Data CDM-425, Installation And Operation Manual

Page: 138 / 744

CDM-425 Advanced Satellite Modem
Revision 0
Front Panel Operation 6–20 MN-CDM-425
CONFIG: Tx

Tx Data

Tx Data Rate
Chapter 3. REAR PANEL CONNECTOR PINOUTS
Tx Data Rate = 01544.000 kbps
Data Invert=Off Clock Invert=Off (

)
Use the top line to edit the Tx Data Rate. Use the bottom line to configure the Data Inversion or
the Clock Inversion features, which provide compatibility with certain older equipment.
On the top line – Edit the Tx Data Rate by using the
◄ ►
arrow keys to select the digit to edit,
and then using
the ▲▼ arrow keys to change that digit. Press
ENTER .
The range for the Tx Data Rate is from 18 kbps to 25 Mbps. The actual minimum and maximum
data rates depend on Framing mode, Interface type, Modulation type and FEC Code Rate. When
you change any of the higher-priority parameters – causing the data rate to become invalid – the
Data Rate adjusts automatically. The installed FAST option(s) also dictate the upper range of
data rate.
When configuring for D&I framing or for G.703 interface type, the
▲▼ arrow keys scroll through
only the available data rates. When you edit the data rate to 1920 kbps while in D&I framing, a
message informs you that E1 Fixed Channel Mode is implemented.
When using G.703, three auxiliary rates are available: 512, 1024 and 2048 kbps. This availability
is indicated when the word
AUX appears to the right of the decimal place (e.g.,
00512. AUX
kbps
). See Chapter 3. REAR PANEL CONNECTOR PINOUTS, Sect. 3.3.2.5 G.703 IDI (Insert
Data In), DDO (Drop Data Out).