FEATURES
2 independent analogue inputs with
adjustable gain.
Inputs can be connected directly to
analogue extension lines.
Optional phantom power for direct
connection of Electret microphone.
2 independent S/T interfaces, with
full NT/TE mode emulation.
Analogue inputs can go as B1 or
B2 to S/T1 and S/T2, or can be
configured for B1+B2 to S/T1 only.
Stable clock source for system
synchronisation.

SPECIFICATIONS
Universal interface for line cards
and recorders with ISDN S-bus.
Inputs to card are high impedance
differential with variable gain.
DC isolation and protection against
battery voltage and ringing current.
Full transformer isolation (>1kV
DC) from analogue and digital
inputs and outputs.
Fully compliant interface to S/T
point of S0 network.
Individual indication of NT and TE
sync. on each channel via LEDs.
A-law speech compression for
optimum voice-band quality.