Primary Rate Interface

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Primary Rate Interface

(PRI) A type of ISDN connection. In North America and Japan, this consists of 24 channels, usually divided into 23 B channels and 1 D channel, and runs over the same physical interface as T1. Elsewhere the PRI has 31 user channels, usually divided into 30 B channels and 1 D channel and is based on the E1 interface.

PRI is typically used for connections such as one between a PBX (private branch exchange, a telephone exchange operated by the customer of a telephone company) and a CO (central office, of the telephone company) or IXC (inter exchange carrier, a long distance telephone company).
References in periodicals archive ?
The report explained that more conservative management of line sizes on large-commercial accounts "is driving much of the improvement in primary rates." In addition to these efforts to manage line sizes, primary carriers are setting minimum rate increases for some lines of business and withdrawing from a number of specialty lines, it continued.
Here, a primary rate is defined as the basic achievable data rate to provide essential communication services for 4DT management.
Case (iii) the maximum of the secondary rate with a guaranteed primary rate.
Under the agreement, the MWRA can charge one of two rates, a primary rate and an alternate rate.
"Rather than showing primary, secondary and tertiary periods, this approach demonstrated that the decaying primary rate is gradually offset by the accelerating tertiary rate, giving a minimum not a 'steady' secondary rate."
Primary Rate Interface or PRI, which is the standard service used by most
The services provided for included regular telephone service, data, ISDN basic, and primary rate and broadband Internet access."
The outage occurred after technicians at Du attempted to carry out an upgrade on the telco's PRI (Primary Rate Interface) line, according to a technician at the operator, who preferred to remain anonymous.
Now, users are no longer required to use Leased Line Emulation Mode (LLEM), freeing many Primary Rate Interfaces (PRI) at constrained downlink facilities.
The Unlimited STD plan will be offered to customers using ISDN PRI(Primary Rate Interface) services as well as regular business landlines.
The Unlimited STD plan is offered to customers using ISDN PRI (Primary Rate Interface) services as well as regular business landlines.
The plan will be offered to customers using ISDN PRI (Primary Rate Interface) services as well as regular business landlines.