Comtech EF Data SDM-650B - Manual (Page 91)

SDM-650B Satellite Modem Configuration
Rev. 5 3–49
3.4 Doppler Buffer Specification
Buffer Size (bits) 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536
Clock Source Receive, transmit, and external clock
Data Rate 9.6 kbit/s to 2.4 Mbit/s
Indicators Buffer overflow (latched)
Buffer underflow (latched)
Controls Reset buffer to center
Reset underflow and overflow indicators
Buffer depth
Output clock source
Control functions jumper
Selectable local or M&C system (optional)
Miscellaneous Buffer automatically recenters on underflow and overflow
3.5 I/O Connectors
J1 25-pin, 0.1” spaced, dual-row header.
Pin # 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