Table 3-6. D&I Parameter Settings; Table 3-7. N X 64 Chart - Comtech EF Data SLM-3650 Installation And Operation Manual

SLM-3650 Satellite Modem
Operation
3.5.1.3 D&I Operation
To operate the modem in the Drop & Insert configuration, the following cards must be
installed in the modem:
•
Overhead G.703/IDR/IBS/ASYNC/AUPC/D&I card (PL/5305-1)
•
50-pin D relay adapter card (PL/5509)
The D&I option is a FAST feature that must be enabled using the front panel and the
Utility Modem Type menu. Table 3-6 lists the parameters that are accessible once the
D&I modem type is enabled.
Parameter
Modem Type
TX Data/Code Rate
TX IF Output
RX Data/Code Rate
TX Clock Source
Buffer Clock Source
TX Coding Format
RX Coding Format
Drop Format
Insert Format
In D&I operation, the transmit data rate is a fractional portion of the trunk T1 or E1
terrestrial input. The N stands for the number of 64 kbps time slots available for
transmission. Table 3-7 shows the allowable TX data rates for D&I with the
corresponding number of time slots available for each data rate. Refer to Chapter 4 for
the interface specifications on the satellite data rates supported for E1 and T1 operation.
Refer to Appendix A, A.1.3, for D&I theory of operation.
Time Slots
1
2
3
4
5
6
8
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Table 3-6. D&I Parameter Settings
Front Panel Settings
D&I
TX-V, QPSK 1/2 (NX64)
ON
RX-V, QPSK 1/2 (NX64)
Table 3-5
TX Terrestrial
Insert Clock
HDB3
HDB3
E1CCS/E1CAS (E1)
E1CCS/E1CAS (E1)

Table 3-7. N x 64 Chart

TX Data Rate Time Slots
64 kbps 10
128 kbps 12
192 kbps 15
256 kbps 16
320 kbps 20
384 kbps 24
512 kbps 30
3–81
Reference Manual
Utility - Modem Type
Configuration - Demodulator
Configuration - Demodulator
Configuration - Interface
Configuration - Interface
Configuration - Interface
Configuration - Interface
Configuration - Interface
Configuration - Interface
TX Data Rate
640 kbps
768 kbps
960 kbps
1024 kbps
1280 kbps
1536 kbps
1920 kbps
Revision 3
MN/SLM3650.IOM