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Appendix E. Glossary
DS0
Digital signal (or service) having a transmission rate of 64 kbps intended to carry one voice channel (a
phone call). Also called a fractional T1 because it bridges the gap between 56-kbps direct dial service
(DDS) and a full T1 implementation (24 channels).
DSU
data service unit. A device used with a CSU to support digital communications by converting signals.
(See also CSU.)
DTE
Data terminal equipment. The portion of a data terminal that interfaces to the end-user's equipment.
The main difference between DCE and DTE is that pins 2 and 3 are reversed on the EIA-232.
DTMF dialing
dual tone multifrequency dialing. The tones used by customer equipment to signal the network.
E1 circuit
European equivalent to the T-1.
ESF
extended superframe. A method of grouping T1 carrier frames into larger superframes, each contain-
ing 24 consecutive T1 frames.
flash memory
A kind of non-volatile storage device, similar to EEPROM, where erasing can only be done in blocks or
the entire chip.
flash upgrades
Upgrades that can be downloaded into the flash memory.
FTP
File Transfer Protocol. The TCP/IP protocol used to log in to a network, list files and directories, and
transfer files.
hot swappable
A device is hot swappable if it can be installed without powering down the main unit.
Integrated Access System
A chassis-based product that supports a number of end-user applications on the subscriber side and a
number of carrier interfaces on the trunk side. The ATLAS 800 is an Integrated Access System
designed to provide significant wide-area cost savings through the consolidation of voice, data, fax,
and video.
ISDN
Integrated Services Digital Network. A network architecture that enables end-to-end digital connec-
tions. The network supports diverse services through integrated access arrangements and defines a
limited set of standard, multipurpose interfaces for equipment vendors, network providers, and cus-
tomers. Interworking with a public switched telephone network is retained.
kbps
Kilobits per second. 1,000 bits per second.
PLUS
61200226L1-1
ATLAS 800
User Manual
E-3
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