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1993-04-19
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SPORTSTER 14,400
CHAPTER 1. FEATURES AND COMPATIBILITY
MODEM FEATURES
The following features and capabilities
assure you of superior reliability and
performance from your USRobotics modem.
Error Control_V.42/MNP 2O4
Data integrity is ensured when Sportster
14,400 modems con-nect with remote
modems that use the V.42 (LAPM) or MNP
error-control protocols. Error control
is available on calls at 1200 bps and
above.
Data Compression_V.42 bis/MNP 5
Data compression enables throughput of
up to 57,600 bits per second (bps) on
14,4K bps connections. The data
compression technique used depends on
the remote modem's capabilities. If the
modems connect under V.42 error control,
they can use V.42 bis compression. If
they connect under MNP error control,
they can use MNP Level 5 compression.
Achievable throughput for text files and
other file types is listed at the end of
Appendix A.
Flow Control/Variable Interface Rates
Flow control, required under error
control, allows the rate at the computer
interface to be set higher than the rate
over the phone line. This feature
provides greater efficiency and
throughput. If your computer and
software support the higher rate, you
can transfer data between the computer
and modem at 38,400 bps, regardless of
the phone line rate.
Fax Capability_Sportster 14,400 Fax Modems
If you've chosen to purchase a Sportster
modem with fax capabilities, you can use
your modem in Class 1 facsimile mode for
sending or receiving faxes.
Programmable Nonvolatile Memory
You can tailor your own default settings
and store them in nonvolatile random
access memory (NVRAM). As long as DIP
switch 7 is set UP, the Sportster 14,400
operates at the settings you've
specified each time the computer is
powered on or reset.
Link Rate Negotiation
The Sportster 14,400 automatically
lowers its connection rate to match a
remote modem's lower rate, in both
Originate and Answer modes. This allows
connections with a wide range of in
stalled modems. When answering higher
speed calls, the modem also shifts back
up again.
Modem Diagnostics
The modem performs three loopback tests:
analog, digital, and remote digital.
See Appendix F for information.
Inactivity Timer
You can set the modem to automatically
hang up after a specified number of
minutes if there is no data activity on
the line.
Call Progress Detection
An optional set of result codes (screen
messages) lets you know when a line is
busy or there is no dial tone.
Modem Settings Display
On command, the modem displays its
current settings, a handy way to check
your transmission rate, S-Registers and
other operational controls. The modem
also displays the defaults stored in
nonvolatile memory and the factory
defaults stored permanently in read-only
memory.
HELP Screens
The modem displays screens that
summarize the command sets, Dial command
options, and S-Register functions.
Bottom Panel Reference
Summaries of important commands and
other information are printed on the
bottom of the modem case. A Dual In-
Line Package (DIP) switch guide makes it
easy to tailor the switch settings to
your terminal and software requirements.
Stored Phone Number
Write your most frequently used phone
number to NVRAM. Then type a brief
command to have the modem dial the
number.
Quote Mode
Set the modem to Quote mode if you want
it to dial an alpha-betic acronym
instead of a number.
COMPATIBILITY
The Sportster 14,400 conforms to the
following standards, ensuring
compatibility with a wide base of
installed modems.
CCITT V.32 bis
14.4K/12K/9600/7200/4800
bps
CCITT V.32 9600/4800 bps
CCITT V.22 bis 2400 bps
Bell 212A 1200 bps (also CCITT V.22)
CCITT V.23 1200 bps with 75 bps back
channel (British phone
system)
Bell 103 300 bps (CCITT V.21
optional)
CCITT V.42 LAPM error control, 1200
bps and higher
CCITT V.42 bis Data compression,
1200 bps and higher
MNP Levels 2, 3 and 4 error
control, level 5 data
compression, 1200 bps and
higher
CCITT V.54 Analog, digital and remote
digital loopback testing
Fax Modems
TIA/EIA-578 Service Class 1
Asynchronous Facsimile
DCE Control Standard
CCITT V.29 9600/7200 bps
CCITT V.27 ter 4800/2400 bps
CCITT V.21 300 bps
Other compatibility features include the
following standards and certification:
∙ Can be used with any computer or
terminal that is com-patible with
the RS-232 standard interface.
∙ Can be used with any computer or
terminal that uses ASCII, the
standard character code supported
by most equipment manufacturers.
∙ Is UL-listed, fully FCC-, DOC- and
CSA-certified for the uses
described in this manual.