1.5
SNM15
Introduction
Digicom SpA
Note
: contacts 11, 12, 13, 14 and 16 have been left free.
Transmitted data clock
:
in synchronous operation, the
modem needs a clock for data
transmission. This may be
generated by the modem (internal
clock) and supplied to the DTE via
the interface circuit C114. The
modem also accepts an external
timer (external clock) supplied on
circuit C113 of the interface,
provided that it has the tolerance
levels envisaged by the CCITT.
Received Data Clock
:
in synchronous mode, the modem
deals with timing the received data
on circuit C115.
Analog Interface
Transmitting support
:
2 balanced wires per switched line
(private PABX exchange or public
PSTN network).
Transmission level
:
from -1 to -16 dBm that can be
adjusted by 1 dbm step.
Data carrier
:
V.21
300 bps FSK
V.22
1200 bps DPSK
V.22bis
2400 bps QAM
