KE LOGEM 928, Руководство по эксплуатации

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188 Operation Manual V.34 - Modems, Version 07/97
Chapter 8
Appendix E
Glossary
DBU Dial Backup Unit
DTE Data Terminal Equipment
Dial Backup Dial backup (switching of a secondary path via
switched lines) is activated whenever the leased
line is broken. The modem establishes automati-
cally a switched line connection to the remote
station. If the leased line is operational again the
modem switches back automatically.
DCE Data Communication Equipment
RAM Random Access Memory. Part of the memory that
can be read out and rewritten. The modem stores
its current configuration in this part of the memory.
After a failure of the operating voltage the memory
content is lost.
ROM Read Only Memory. The factory defaults are stored
in the ROM where they are available permanently.
EEPROM Electrically Erasable Programmable Read Only
Memory. User configuration and phone numbers
are stored here with a specific command.
direct call The direct call option allows for dialing a phone
number (stored with AT&Z0) from the number
directory without a dial command just by setting
the interface line S1/DTR.
direct mode Direct mode allows for transparent data trans-
mission. The transmission rate between modem and
the DTE corresponds to the transmission rate
between the modems. DTE data is transfered
directly to the modulator of the modem, i.e. data
is transfered without a data buffer. Data flow control
between modem and DTE is not necessary here. A
connection has to be deestablished by deactivation
of S1/DTR as the escape sequence (+++) is not
recognized here.
Appendix