BR4 - Appliance User Manual v2.0
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1.
General overview
What is BR4 - Appliance?
BR4 - Appliance is a Blackfin DSP based
Asterisk
driven, S/T interface
embedded appliance
. It is an
open source
embedded platform based on
uClinux
and
SwitchFin
.
B
asic
R
ate
I
nterface is
Integrated Services Digital Network
(ISDN)
configuration that consists of two B channels (64 kbits/s “bearer” channels) used
for voice and data. And one D channel (16 kbits/s “data” channel).
The physical interface is called S/T. It uses four wires with a separate pair of
wires for the uplink and another pair for the downlink.
The typical use of the BRI interface is in residential solutions.
The mISDN ports can be configured for PTP or PTMP mode. PTP (Point to
Point) is a type of connection restricted to two end points.
PTMP (Point to Multi Point) is a type of connection, providing multiple pats
from a single point to multiple points (locations).
