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Switch SW1: Line Coding
Use Switch SW1 to control the Network Line Coding options. Set
these options to be the same as the Line Coding given to you by your
Service Provider. If you are using two Model 2094s together as short
range modems, set both units to HDB3.
SW4 Line Framing & Coding
Off HDB3
On AMI
Line Coding Options:
High Density Bipolar 3 (HDB3): In HDB3 coding, the transmitter
deliberately inserts a bipolar violation when excessive zeros
in the data stream are detected. The receiver recognizes
these special violations and decodes them as zeros. This
method enables the network to meet minimum pulse density
requirements. Use HDB3 unless AMI is required in your
application .
Alternate Mark Inversion (AMI): AMI coding does not inherently
account for ones density. To meet this requirement, the user
should ensure that the data inherently meets pulse density
requirements.
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3.0 CONFIGURATION
The Model 2094 features configuration capability via hardware
switches or a software control port. This section describes all possible
hardware and software switch configurations of the Model 2094.
3.1 DIP SWITCH CONFIGURATION
The Model 2094 has eight internal DIP switches that allow configu-
ration for a wide range of applications. The eight switches are
accessed by opening the plastic case with a small screwdriver. Figure
1 (below) shows the location of the DIP switches on the bottom of the
printed circuit board.
The Model 2094 DIP switches (Switches SW1 - SW8) can be con-
figured as either “On” or “Off”. Figure 2 (below) shows the orientation
of the DIP switches with respect to ON/OFF positions.
Default positions for Switches SW1-SW8 are shown in the table on
the following page. Descriptions of each switch follow the table.
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Figure 1. Model 2094 bottom view, showing location of DIP switches
DIP Switches
OFF
ON
Figure 2. Close up of DIP switches showing ON/OFF positions.
The switch is shown in the Off position.
ON
OFF
Software Configuration Port
SWITCH SET SUMMARY TABLE
Position Function Factory Default Selected Option
SW1 Line Coding Off HDB3
SW2 CAS Multiframe Off Disabled
SW3 CRC-4 Multiframe Off Disabled
SW4 Clock Mode Off Network
SW5 DTE Rate Off
SW6 DTE Rate Off
SW7 DTE Rate Off
SW8 DTE Rate Off
2.048 Mbps
Clear
Channel
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