56
C
HAPTER
5: G
L OSSA RY
half duplex
Signals can flow in both directions, but only one way at a time. In
microcomputer communications, may refer to activation of the online
local echo, which causes the modem to send a copy of the transmitted
data to the screen of the sending computer.
Hz
Hertz, a frequency measurement unit used internationally to indicate
cycles per second.
Internet
An electronic communications network that connects computer networks
and organizational computer facilities around the world.
Internet Service Provider
A company which provides dial-up (modem) access to the Internet for a
fee.
ITU-T
An international organization that defines standards for telegraphic and
telephone equipment. For example, the Bell 212A standard for 1200-bps
communication in North America is observed internationally as ITU-T
V.22. For 2400-bps communication, most U.S. manufacturers observe
V.22 bis.
LAPM
Link Access Procedure for Modems. An error-control protocol defined in
ITU-T recommendation V.42. Like the MNP protocols, LAPM uses cyclic
redundancy checking (CRC) and retransmission of corrupted data (ARQ)
to ensure data reliability.
local echo
A modem feature that enables the modem to display keyboard
commands and transmitted data on the screen. See basic data command
En in the “Technical Reference” chapter of this manual.
Summary of Contents for 3CP5610A - U.S. Robotics 56K V90 PCI Performance Pro Faxmodem...
Page 1: ...http www usr com U S Robotics Modems User s Guide Published September 2000...
Page 10: ...4 CHAPTER 1 56K FAXMODEM PRODUCT FEATURES...
Page 16: ...10 CHAPTER 3 UNINSTALLING A U S ROBOTICS MODEM...
Page 56: ...50 CHAPTER 4 TROUBLESHOOTING AND HELP RESOURCES...