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DSU Glossary
Administration for Network Connectivity
CID: 77730 555-233-504 — Issue 1 — April 2000
474
DSU
Data service unit.
DTDM
Digital-terminal data module.
DTE
Data-terminal equipment.
E E-1
A digital transmission link with a capacity of 2.048 Mbps (2,048,000 bits per
second). The European equivalent of the T-1. It can support 30 multiplexed
64-Kbps voice and data channels plus separate 64-Kbps channels for signalling
and framing (synchronization). Also spelled E1.
EIA
See Electronics Industries Association (EIA).
EIA-232
A physical interface specified by the EIA. EIA-232 transmits and receives
asynchronous data at speeds of up to 19.2 kbps over cable distances of up to 50
feet. EIA-232 replaces RS-232 protocol in some DEFINITY applications.
electronic tandem network (ETN)
A tandem tie-trunk network that has automatic call-routing capabilities based
on the number dialed and the most preferred route available. Each switch in the
network is assigned a unique private network office code (RNX), and each
voice terminal is assigned a unique extension.
Electronics Industries Association (EIA)
A trade association of the electronics industry that establishes electrical and
functional standards.
Ethernet
A local area network (LAN) that works over short distances on twisted-pairs or
coaxial cables at speeds up to 10 mbps or 100 mbps. One of the two LAN
protocols MMCX supports. See ATM, LAN emulation (LANE).
Ethernet Source Address
A 48-bit physical address of the NIC; also called the MAC address.
ETN
Electronic tandem network