Instruction manual

GLOSSARY
E
Electronic Tandem Network (ETN)
A special tandem tie trunk network that has automatic call routing capabilities based on
the number dialed and most preferred route available at the time the call is placed. Each
switch in the network is assigned a unique RNX and each voice terminal is assigned a
unique extension number.
End-to-End Signaling
The transmission of touch-tone signals generated by dialing from a voice terminal user to
remote computer equipment. A connection must first be established over an outgoing
trunk from the calling party to the computer equipment. Then additional digits can be
dialed to transmit information to be processed by the computer equipment.
Enhanced Private Switched Communications Service (EPSCS)
A private telecommunications network that provides advanced voice and data telecom-
munications services to companies with many locations.
Expansion Interface
Used to connect an EPN to the Processor Port Network TDM Bus and provide connec-
tivity between the TDM buses on the PPN and EPNs. This circuit pack carries synchroni-
zation information between the two cabinets that it connects and also provides connec-
tivity between the packet buses on the PPN and EPNs.
Expansion Port Network
A cabinet that contains port circuit packs but no
processor. Up to two EPNs may be con-
nected to a PPN.
Extension Number
A 1- to 5-digit number assigned to each voice terminal, certain system groups, data
modules, and various other facilities on the switch. The number is used in call process-
ing to access the facility.
External Call
A connection between a system user and a party on the public telephone network or on a
tie trunk.
G-12