User guide

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Chapter 2 - Configuration
2.3 Configuration 2
Configuration 2 is two MultiMux MMH904Ca four channel multiplexers
with two external Multi-Tech MultiModemII MT2834BLs linking the two
sites over an async dial-up line. The MultiModemII's are connected to
the dial-up line and the RS232C interface from the modems is connected
to the EXTERNAL COMPOSITE LINK connector on the back panel of
the MMH904Ca's. The MH904Ca's are set up for an external link device
with a maximum link speed of 57,600 bps. The maximum link speed is
dependent on the compressibility of the data over the link. The
MultiModemIIs are set up for data compression and error correction in
order to achieve the link speed.
Figure 2-2. Configuration 2
The External Composite Link LEDs on the lower left side of the front
panel and the SYSTEM ASYNC LINK LED in the middle of the front
panel of the MMH904Ca's are active for this configuration. The channels
are set up with the same considerations as in Configuration 1.The
composite link configuration may be changed using the List Composite
Link Configuration ($L) command which is shown in the following
example.
LINK LINK MUX MUX EOF XMT EOF RCV LOOP
DEVICE FORMAT SPEED CLOCKING CHARACTER CHARACTER BACK
EXTERNAL ASYNC 57600 EXTERNAL FF FF OFF
Configuration 2 Composite Link Configuration