Primary Rate Interface

PRIprimary rateISDN30PRA or PRIPrimary Rate (PRI)
The Primary Rate Interface (PRI) is a telecommunications interface standard used on an Integrated Services Digital Network (ISDN) for carrying multiple DS0 voice and data transmissions between the network and a user.wikipedia
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Integrated Services Digital Network

ISDN ISDNISDN30
The Primary Rate Interface (PRI) is a telecommunications interface standard used on an Integrated Services Digital Network (ISDN) for carrying multiple DS0 voice and data transmissions between the network and a user.
The ISDN standards define several kinds of access interfaces, such as Basic Rate Interface (BRI), Primary Rate Interface (PRI), Narrowband ISDN (N-ISDN), and Broadband ISDN (B-ISDN).

B channel

B-ChannelB' channelsbearer (B) channels
The T1 line consists of 23 bearer (B) channels and one data (D) channel for control purposes, for a total bandwidth of 24x64-kbit/s or 1.544 Mbit/s.
The term is applied primarily in relation to the ISDN access interfaces (PRA or PRI and BRA or BRI), since deeper in the PSTN network an ISDN bearer channel is essentially indistinguishable from any other bearer channel.

D channel

D' channeldata (D) channel
The T1 line consists of 23 bearer (B) channels and one data (D) channel for control purposes, for a total bandwidth of 24x64-kbit/s or 1.544 Mbit/s.
The bit rate of the D channel of a basic rate interface is 16 kbit/s, whereas it amounts to 64 kbit/s on a primary rate interface.

Basic Rate Interface

BRIISDN BRI2B1D
In contrast to the BRI, the Primary Rate Interface (PRI) configuration provides more B channels and operates at a higher bit rate.

Non-Facility Associated Signalling

Non-Facility Associated Signaling or NFAS is a Primary Rate Interface configuration whereby multiple T1 carriers share a signaling channel (or D channel).

Direct inward dial

Direct Inward Dialingdirect inbound dialingDDI
PRI channels and direct inward dialing are also common as a means of delivering inbound calls to voice over IP gateways from the PSTN.
Nowadays, it is far more common to deliver DID service on a Primary Rate Interface (PRI) circuit.

Caller ID spoofing

spoofspoofedCaller ID
Caller ID spoofing has been available for years to people with a specialized digital connection to the telephone company, called an ISDN PRI circuit.

Business telephone system

PBXprivate branch exchangePABX
The Primary Rate Interface channels are typically used by medium to large enterprises with digital private branch exchange (PBX) telephone systems to provide digital access to the public switched telephone network (PSTN).

Telecommunication

telecommunicationscommunicationstelecom
The Primary Rate Interface (PRI) is a telecommunications interface standard used on an Integrated Services Digital Network (ISDN) for carrying multiple DS0 voice and data transmissions between the network and a user.

Digital Signal 0

DS0D 0 (DS0)DS-0
The Primary Rate Interface (PRI) is a telecommunications interface standard used on an Integrated Services Digital Network (ISDN) for carrying multiple DS0 voice and data transmissions between the network and a user.

T-carrier

T1T-1T1 carrier
It is based on T-carrier (T1) transmission in the US, Canada, and Japan, while the E-carrier (E1) is common in Europe and Australia.

E-carrier

E1E-1digital trunks
It is based on T-carrier (T1) transmission in the US, Canada, and Japan, while the E-carrier (E1) is common in Europe and Australia.

Frame synchronization

framingframeFraming bit
The first timeslot on the E1 is used for synchronization purposes and is not considered to be a B- or D-channel.

Public switched telephone network

PSTNpublic telephone networktelephone network
The Primary Rate Interface channels are typically used by medium to large enterprises with digital private branch exchange (PBX) telephone systems to provide digital access to the public switched telephone network (PSTN).

Voice over IP

VoIPVoice over Internet Protocolvoice-over-IP
PRI channels and direct inward dialing are also common as a means of delivering inbound calls to voice over IP gateways from the PSTN.

VivaConnect

It holds a pool of 2000 PRIs handling a daily traffic of over 50 million voice calls.

Caller ID

caller line identificationCaller-IDCalling Line Identification
In the typical telephony environment, a PBX connects to the local service provider through Primary Rate Interface (PRI) trunks.

Internet in Malaysia

This definition is far below the primary rate interface lower limit defined by the International Telecommunications Union in ITU-R F.1399.

OpenBSC

It runs on Linux and requires an E1 interface (ISDN Primary Rate Interface, via mISDN).

Digital Subscriber System No. 1

DSS1Digital Subscriber System No. 1 (DSS1)EDSS1
These documents, called NET3 for BRI and NET5 for PRI lines, described a set of protocol tests terminals should comply to.

Internet access

broadband internetbroadband Internet accessbroadband
In 1988 the CCITT standards body defined "broadband service" as requiring transmission channels capable of supporting bit rates greater than the primary rate which ranged from about 1.5 to 2 Mbit/s.

Cisco Catalyst

CatOSCatalystCatalyst switch
Other models can support T1, E1, and ISDN PRI interfaces to provide connections to the PSTN.