Comtech-ef-data SDM-2020 Instrukcja Użytkownika Pobierz pdf (Strona 172)

SDM-2020 Satellite Demodulator Revision 4

G.703 Data Interface MN/SDM2020D.IOM

11–6

Table 11-1. G.703 Specification (Continued)

G.703 Specifications (Continued)

External Reference Clock

Input Signal Characteristics

Sine wave or square wave with duty cycle of 50% (± 10%)

Input Amplitude 0.5 to 5.0V peak to peak

Input Impedance

75Ω ± 5%

Input Frequency 1.544 to 20.0 MHz in steps of 8.0 kHz or at RX data rate

Connector Type BNC (female)

Auxiliary Functions Port

Signals DF (demodulator fault, open collector TTL output)

CD (carrier detect, TTL output)

Connector Type 9-pin sub-D (female)

Controlled Items:

Data Date Rate

Line Coding

Test Modes Interface Loop-Through

Interface Loopback

RX2047 Pattern

Buffer/Doppler/Plesiochronous Size

Clock Source

Frame Structure

Buffer Centering

Monitor Functions

RX Interface Faults Buffer underflow, buffer overflow, buffer clock activity, buffer clock

PLL, buffer full, data/AIS, 2047 pattern lock, FPGA program

Buffer Fill Status 1 to 99%

RX 2047 Error Rate 1E-3 to 5 E-8 (with one magnitude accuracy)

11.1.4 Receive Specifications

The following receive specifications apply when the G.703 data interface is installed in

an SDM-2020 Demodulator.

11.1.4.1 Receive Data Rate 1.544 Mbps Specifications

Refer to Table 11-2 for data rate specifications.

Table 11-2. RX Data Rate 1.544 Mbps

Parameter Specification

Data Rate

1.544 Mbps, ± 30 ppm

Line Coding B8ZS and AMI at 1.544 Mbps

Pulse Shape Rectangular per ITU-T-G.703, Figure 12/G.703.

Jitter Characteristics:

Input Jitter

Output Jitter

Complies with ITU-T-G.824 and Table 1/G824.

In accordance with ITU-T-G.824 and Figure

1/G.824.

1 2 ... 167 168 169 170 171 172 173 174 175 176 177 ... 233 234

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