Doppler Buffer Specification; I/O Connectors - Comtech EF Data SDM-650B Installation And Operation Manual

SDM-650B Satellite Modem

3.4 Doppler Buffer Specification

Buffer Size (bits)
Clock Source
Data Rate
Indicators
Controls
Miscellaneous

3.5 I/O Connectors

J1 25-pin, 0.1" spaced, dual-row header.
Pin #
Rev. 5
512, 1024, 2048, 4096, 8192, 16384, 32768, 65536
Receive, transmit, and external clock
9.6 kbit/s to 2.4 Mbit/s
Buffer overflow (latched)
Buffer underflow (latched)
Reset buffer to center
Reset underflow and overflow indicators
Buffer depth
Output clock source
Control functions jumper
Selectable local or M&C system (optional)
Buffer automatically recenters on underflow and overflow
Description
1 /BUFBDS
2 GND
3 TCLK
4 NC (/TCLK)
5 DB0
6 DB1
7 DB2
8 DB3
9 DB4
10 DB5
11 DB6
12 DB7
13 RCLK-SND
14 RDATA-SND
15 RCLK-RTN
16 RDATA-RTN
17 /BUFALE
18 BUFWR
19 BUFRD
20 EXTCLK
21 VCC
22 VCC
23 SPARE
24 GND
Configuration
3–49