Patton electronic X.21 Interfaces - Manual (Page 7)

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Figure 2. Close up of configuration switches
Switch SW1-1 through SW1-8
Switch SW1-1 Line Coding: HDB3 (default)
Use Switch SW1-1 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 2707s together as short
range modems, set both units to HDB3.
Table 1: Switch Set 1 Summary
Position Function Factory Default Selected Option
SW1-1 Line Code OFF HDB3
SW1-2 LLB OFF OFF
SW1-3 Reserved
SW1-4 Reserved
SW1-5 Reserved
SW1-6 Clock Mode OFF Received
Recovered
SW1-7 Clock Mode OFF Received
Recovered
SW1-8 TM from DTE OFF Enabled
SW1-1 Line Encoding
Off HDB3
On AMI