Lucent Technologies SLC ConnectReach User & Service Manual page 522

Glossary 363-208-050
DLCI — Data Link Connection Identifier. The frame relay virtual circuit number corresponding to a
particular destination. The DLCI is part of the frame relay header.
DM — Degraded Minute. Minute during which the estimated error rate exceeds 1E-6 but does not exceed
1E-3 (see G.821 [15]).
DNIS — Dialed Number Identification Service. DNIS provides the number the caller dialed. Used with 800
and 900 lines, DNIS capabilities allow one trunk group to be used for multiple service applications.
DNS — Domain Name Service. A DNS server resolves an Internet domain name, such as lucent.com, to
an IP address. A DNS proxy manages Internet name resolution requests on behalf of devices on a private
network.
DPT/DPO — Dial Pulse Terminating/Originating.
DS0 — Digital or data signal level 0. The basis of a 64-kbps digital data stream.
DS1 — Digital signal level 1. The 1.544-Mb/s T1 line.
DSP — Digital Signal Processor. A specialized digital microprocessor that performs calculations on
digitized signals that were originally analog (for example, voice) and then sends the results on.
DT — Distant Terminal. A compact cost effective terminal that is normally located near or at the customer's
premises to provide a full range of narrowband services including POTS, special services, and integrated
services digital network. The DT interfaces to a SLC-2000 host digital terminal (HDT) by means of a DT
Server card located in the metallic distribution shelf assembly.
DTE — Data Terminal Equipment. The name applied to a piece of equipment such as personal computers,
systems network architecture (SNA) control units, automatic teller machines, reservation terminals, etc.
DTMF — Dual Tone Multifrequency. A type of signaling consisting of a push button or touchtone dial that
sends out two discrete tones which are picked up and interpreted by telephone switches.
E
E&M Signaling — Conventional telephony arrangement that uses separate leads called, respectively, the
"E" ("ear") lead and "M" ("mouth") lead, for signaling and supervisory purposes. In the SLC ConnectReach
system, references to E&M signaling refer to a signaling type supported on DID trunks. It does not refer to
the E&M signaling used over metallic leads with older transmission equipment.
ENAT — Enterprise Network Address Translation. Used in T1 line statistics. A utilization of Network
Address Translation (NAT) that allows translation of IP addresses for workstations at remote offices to
WAN IP addresses (WAN-to-WAN) by means of Frame Relay PVCs.
ES — Errored Seconds.
ESF — Extended Superframe Format. A framing format that allows a maintenance channel and
error-detection capability on a DS1.
GL-4
Issue 4 June 2002