APPENDIX A
TM Option 45 Buffer/Pulse Rate Module Assembly 21057
1.0 INTRODUCTION
This module provides a one input, three output buffer on a pulse rate generator assembly that can be
installed into the TymMachine 7000.
Depending upon the dash number configuration, the three output buffers can output the buffered
input signal or output pulse rates as follows:
Assembly
Number
Description TM Option
21057
50Ω output impedance via BNC
connectors.
TM Option 45A
21057-1 Same as 21057 except 10kpps is
generated instead of 20kpps.
TM Opt 45A
21057-2 Transformer coupled output via
Twinax connectors.
TM Option 45B
21057-3 RS-422 outputs via Twinax
connectors
TM Option 45C
1.1 GENERAL DESCRIPTION
This assembly can be built in three configurations and then jumpered to function as a buffer or pulse
generator. Regardless of the configuration, to have this assembly function as a one input, three
output buffer, install a jumper plug between JP1-2 and JP2-2 as shown in Figure One.
To configure this assembly as a pulse rate generator, jumper JP1-1 to JP2-1.
Figure One
JP1 JP2
11
2
2
J1
Jumper
If this assembly is configured as a pulse rate generator, the pulses can be output as standard counter
terms with duty cycles of 80% - 20% etc., or as pulse outputs with a pulse width of ten
microseconds (rising edge on-time). To jumper as standard counter terms, install a jumper plug
between JP3-2 and JP4-2 as shown in Figure Two.
A-56 TM7000 TymMachine TCG/T (Rev D) Symmetricom, Inc.
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