INSTALLATION MANUAL
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GLOSSARY
DISA – Acronym for Direct Inward System Access. This function allows an outside caller to
directly access a local subscriber of the phone exchange by using DTMF codes. The typical
application is when you call directly a local subscriber without need for a human operator at the
phone exchange. Voxell LCRmakes use of DISA to route the calls, for example allowing a local
subscriber to dial (using DTMF codes) a mobile number via Voxell LCR FXS.
DTMF – Acronym for Dual Tone Multi Frequency, also known as "touch tone". Advanced method
for dialing a number, instead of the older PULSE mode. When you press a key on the keypad a
combination of two audio frequencies is sent on the line. DTMF capability is important because it
allows access to a wide range of interactive voice applications. Voxell LCR uses DTMF dialling to
transmit the numbering from local subscribers to the mobile networks.
PBX - Acronym for Private Branch eXchange. The PBX is a small, private version of the larger
central switching office of the phone company. A PBX is a private telephone switch. It is
connected to groups of lines (junctions) from one or more central offices and to all of the
telephones at the location (subscribers, extensions) served by the PBX. Current exchanges are in
fact PABX, automated PBX, which don’t require a human operator to route the calls. Voxell
LCRiwas designed to work optimally together with a phone exchange, but it can also be used
without PBX, it can perform advanced call routing by itself.
USB – Acronym for Universal Service Bus. A high-speed port, which allows serial communication of
several peripheral unit. Up to 127 peripheral units can be connected to a PC. The USB interface of
Voxell LCR is used for data transfer and for communication with the OAM program.
FXO – Foreign eXchange Office – interface (the plug on the phone)receives POTS service, tipically
from a Central Office of the Public Switched Telephone Network (PSTN). An FXO interface
provides the following primary service to the TELCO network device: on-hook / off-hook indication
(loop closure)
FXS - Foreign eXchange Subscriber interface (the plug on the wall) delivers POTS service from the
local phone company`s Central Office and must be connected to subscriber equipment
(telephones, modems, fax machines). Am FXS interface provides the following primary services to
a subscriber device: Dial Tone, Battery Current, Ring Voltage