907-0601-00 Rev. C Model 907 Video/Data Multiplexer – User’s Guide
Focal Technologies Corp. Page 5-11
5.9 907-TTL (8-Channel TTL Card)
The 907-TTL shown in Figure 5-9 is an 8-Channel Transistor-Transistor Logic (TTL) multiplexer card based
on the 907-232 expansion card. By means of switch configuration, eight TTL channels are multiplexed into a
single stream (8:1), which is transported over a single backplane data port on the motherboard. Alternatively,
4:4 and 4:1 multiplexing options are available.
Figure 5-9: 907-TTL Expansion Card
The 907-TTL expansion cards have 5 V TVS diodes and 100-ohm inline resistors for protection. Similarly,
outputs have 5 V TVS diodes and 22-ohm inline resistors. Maximum input and output signal ranges are from
-0.5 V to +5.5 V.
Configure switch SW9 to set the backplane data port used by the 907-TTL card. Ports 3~6 are available. The
default setting is data port #3.
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