3Com 3C900B Installation And Operating Instructions Manual page 121

Fn Sets online local echo of
transmitted data ON/OFF.
F0 Local echo ON.
Modem sends a copy
of data it sends to the
remote system to your
screen.
F1 Local echo OFF.
Receiving system may
send a remote echo of
data it receives.
Hn Controls ON/OFF hook.
H0 Hangs up (goes on
hook).
H1 Goes off hook.
In Displays the following
information.
T Q R
ECHNICAL UICK EFERENCE
Ln
I0 Four-digit product
code
I1 Results of ROM
checksum
I2 Results of RAM
checksum
I3 Product type
I4 Current modem
settings
I5 Nonvolatile memory
(NVRAM) settings
I6 Link diagnostics
I7 Product configuration
Controls speaker volume
(internals only).
L0 Low volume
L1 Low volume
L2 Medium volume
L3 High volume
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