i2021 ISDN Teleset
Fig. 3: NT1 Leads
PS1/PS2 Switch Settings
nIf power is supplied on pins 7&8, set the PS1/PS2 switch to PS2.
nIf power is supplied on pins 3&6, 4&5 only, set the PS1/PS2 switch to PS1.
nIf power is supplied on pins 3&6,4&5,7&8, set PS1/PS2switch to PS2.
nIf your NT1 does not supply power, you must use an external
Fig. 4: Powering a Teleset (S/T) with an External Power Supply
Terminating Resistors
The i2021Teleset has
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