Comtech EF Data SDM-300L3 - Manual (Page 121)

SDM-300L3 Satellite Modem Revision 1
Front Panel Operation MN/SDM300L3.IOM
4–53
Note: If only 4-Channel SYNC/ASYNC is enabled, only tributaries 1 to 4 will be
displayed.
FUNCTION SELECT: CONFIGURATION: MUX:
AGGREGATE DATA RATE
AGGREGATE DR
2305.3 Kbps
3.7 to 4001.3 kbps > 4001.3 or < 3.7 kbps, status only
The aggregate data rate is the sum of all tributary data rates plus the multiplex overhead
4.6.1.3 FUNCTION SELECT: CONFIGURATION: FLEX MUX
(OPTIONAL/CONDITIONAL)
CONFIGURATION
FLEX MUX
IMPORTANT
Conditional:This menu is available only if the optional FLEX MUX
card is installed, and Modem Type = CUSTOM with Overhead Type =
FLEX MUX.
Flex Mux is offered as a factory or field installed interface. Simultaneous operation of a
main data channel and three overhead channels are supported. The main data channel is a
G.703 type electrical interface at E1 (2048 kbps) or T1 (1544 kbps) terrestrial data rate
and supports both pass through and D&I modes of operation. AUPC, ASYNC data and
voice channels are supported in the three overhead channels.
Channel (Main Data) # 1: G.703, E1 or T1
Channel (Overhead) # 2: ADPCM (Audio)
Channel (Overhead) # 3: EIA-232, EIA-422, or AUPC
Channel (Overhead) # 4: EIA-232, EIA-485 or AUPC
The modulator and demodulator data rates are status only. Only the code rate can be
changed. The data rate displayed
includes data rates of all channels plus 1.3 kbps
(if applicable) fixed overhead. When calculating the symbol rate based on the
programmed code rate, D&I overhead (16/15 if enabled) and Reed-Solomon overhead
(126/112 or 219/201 if enabled) must be included.