Comtech EF Data SDM-300A - Manual (Page 143)

SDM-300A Satellite Modem Revision 6
Front Panel Operation MN/SDM300A.IOM
5–49
Select the mode. If ASYNC is chosen, select the ASYNC FORMAT as well.
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
5.4.1.6 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.