COURIER HIGH SPEED MODEMS
when
the
power
is
turned
off. The
modem's
RAM
holds
the
cur-
rent
operational settings, a flow control
buffer,
and
a
command
-
-
buffer. -
Remote Access
A feature
that
allows a remotely-located
user
to view the
Courier's configuration screens
and
change
the
Courier's
configuration.
Password
protection is available.
Remote Digital Loopback
A test
that
checks the
phone
link
and
a remote
modem's
trans-
mitter
and
receiver. Data
entered
from
the
keyboard
is trans-
mitted
from
the
initiating
modem,
received
by
the remote
modem's
receiver,
looped
through
its transmitter,
and
returned
to the local screen for verification.
Remote Echo
ROM
A
copy
of the
data
received
by
the
remote
system,
returned
to
the
sending
system
and
displayed
on
the
screen. Remote echo-
ing
is a function of
the
remote
system.
Read
Only
Memory.
Permanent
memory,
not
user-pro-
grammable. The Courier's factory settings are
stored
in
ROM
and
can
be
read
(loaded) into RAM as
an
operational configura-
tion if DIP switch SlO is
ON
at
power
on.
Serial Transmission
The transfer of
data
characters
one
bit
at
a time, sequentially,
using
a single electrical path. See
Parallel
Transmission.
Start/Stop Bits
-
-
-
-
-
-
-
-
-
The signaling bits attached to a character before
the
character is -
transmitted
during
Asynchronous
Transmission.
SDLC
Synchronous Data Link Control. A protocol
developed
by
IBM
for software applications
and
communicating devices
operating
-
in
IBM's Systems
Network
Architecture (SNA). The protocol -
defines operations
at
the link level of communications, for
example,
the
format of
data
frames
exchanged
between
modems
over
a
phone
line. See Bisync, Protocol, HDLC. _
G-1 O Glossary
-
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