| When the Sync Data Channel is used and the MultiMux is | providing the clocking, | |||||
a word of caution; the Mux Speed command |
| should not be set so high that the Sync Data Channel over runs | |||||
| the composite link. Things to consider are that if a voice/fax board | is installed, voice takes | |||||
the highest priority (voice compression is |
| either 9.6K or 16K of the bandwidth), the Sync Data Channel is | |||||
the next highest priority and the speed should be set so that the | remaining bandwidth for | all the async | |||||
channels does not override | the composite link and there is sufficient bandwidth for the async |
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channels. |
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| When Port B is selected as a Sync Data Channel, the following | Mux Speed commands | |||||
are used: |
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| $MUXBSP9600 | $MUXBSP14400 |
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| $MUXBSP19200 | $MUXBSP38400 |
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| $MUXBSP56000 | $MUXBSP64000 |
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Mux B | The Mux B command causes Composite Link B (Port B) to | operate as a Sync Data Channel | |||||
or as a composite link. The | $MUXB | $MUXBSYNC command places Port B in a synchronous data |
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channel mode. The $MUXBCOMP command sets Port B to | operate as a composite link. When port B is in a | ||||||
sync data |
| channel mode, the mux clocking and speed commands should be | considered. | ||||
The MultiMux must be reset for the command to take | affect. The default condition is port B set as Composite Link | ||||||
B. |
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5.2.4
Additional Composite Link Commands
The Additional Composite Link commands perform the function of a system monitor. In addition to displaying the information available on the MultiMux’s LED display, they also provide additional network statistical information. The purpose of the commands are to allow network monitoring via the supervisory port as an alternative to viewing the LED
indicators. The various status commands and their functions are detailed below: |
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Clear | The | Clear | Composite | Statistics | command | clears | the | composite | |
Composite | statistics record without resetting the entire MultiMux unit. The |
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Statistics | #CA command clears link A composite statistics and #CB clears |
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| link B statistics. |
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#C |
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Load DSU | The Load DSU Factory Defaults command returns the status of |
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Factory Defaults | the internal DSU to its original (default) status as shipped from |
| the factory. The default | ||||||
conditions are as follows: |
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$F |
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| Speed: | 56K |
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| Clock: | DDS |
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Flush Timer | This command is necessary when the mux is used with Alpha- | Value | Microcomputer and | ||||||
Wyse Terminals. | The command allows for | the proper use of the function keys as indicated on the keys. The | |||||||
#FT | #FT0 command clears the function and sets the flush time value |
| to 10 msec and #FT1 | ||||||
sets the flush time value to 20 msec. The | default is #FT0. |
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List | The List Composite Link Configuration command causes the | Composite | MultiMux to | ||||||
display | its | internal | composite | link | or | sync | data | ||
Link | channel parameters on the supervisory console. The following Configuration | e x a m p l e s | |||||||
show the configuration of compoiste links A and B or | composite link A and port B as a sync data channel. Composite | ||||||||
$L | link A is only used as a link connection, where as, composite link |
| B (port B) can be used | ||||||
in a link configuration or as a synchronous | data channel. The | ||||||||
| board configures link A for an external link device in the Closed |
| (Down) | position or | |||||
internal DSU in the Open (Up) position. DIP | Switch SW3 configures port B in the same manner when this link | ||||||||
| is used as a composite link. When port B is used as a sync data |
| channel, | DIP Switch | |||||
SW3 has no affect. The first two examples | show the configuration of ports A and B when the MultiMux is | ||||||||
configured as composite links A and B. The next two examples | show | the composite link | A as a link | ||||||
connection and port B as a |
| synchronous data channel. |
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| CONFIGURATION OF PORT A: COMPOSITE LINK |
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| DSU TYPE SPEED | CLOCKING | LOOPBACK |
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| EXTERNAL | 128K | INTERNAL | OFF |
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CONFIGURATION OF PORT B: COMPOSITE LINK
DSU TYPE SPEED CLOCKING LOOPBACK
