D&I Operation; Table 3-6. D&I Parameter Settings; Table 3-7. N X 64 Chart - Comtech EF Data SDM-300A Installation And Operation Manual

SDM-300A Satellite Modem
3.4.2.3 D&I Operation
To operate the modem in the Drop & Insert configuration, the following cards must be
installed in the modem:
•
•
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 kbit/s 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 for D&I theory of operation.
Rev. 4
Overhead G.703/IDR/IBS/ASYNC/AUPC/D&I card (PL/5305-1)
50-pin D relay adapter card (PL/5509)
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

Time Slots TX Data Rate
1 64 kbit/s
2 128 kbit/s
3 192 kbit/s
4 256 kbit/s
5 320 kbit/s
6 384 kbit/s
8 512 kbit/s
Reference Manual
Utility - Modem Type
Configuration - Demodulator
Configuration - Demodulator
Configuration - Interface
Configuration - Interface
Configuration - Interface
Configuration - Interface
Configuration - Interface
Configuration - Interface
Time Slots TX Data Rate
10 640 kbit/s
12 768 kbit/s
15 960 kbit/s
16 1024 kbit/s
20 1280 kbit/s
24 1536 kbit/s
30 1920 kbit/s
Operation
3–79