Ce înseamnă PRI? Circuite, Rețele, Definiție

PRI este o soluție de comunicații end-to-end care se bazează pe o rețea fizică de fire de cupru. PRI înseamnă sistem de interfață de rată primară. Această rețea fizică poate transmit voce, date și video. Este un tip de servicii integrate Digital Network (ISDN) because it transmitmai multe tipuri de comunicare printr-o singură rețea.

În timp ce soluții precum VoIP systems use a digital network, a PRI system relies on traditional phone lines. Primary Rate Interface, or PRI, emerged as a dominant telecommunication solution in the 1980s. It is less popular now due to the rise of VoIP, but a PRI system still remains viable for businesses looking to cut costs.

Cum funcționează PRI?

A PRI network relies on circuits with two twisted pairs of copper wires. Some countries use the E1 standard for these wires, while others use T1 wires. T1 wires connect end devices like phones or computers to the PSTN, or Public Switched Telephone Network.

The diagram below shows how a PRI system links end devices such as phones and computers to the public telephone network through a single circuit:

In a traditional phone system, the copper wires include one twisted wire that creates a single delta channel (the D-channel). The other twisted wire allows for two bearer channels (B-channels). The delta channel typically carries the signaling information that controls the bearer channels and does not transmit pachete de voce, video sau date.

With a PRI line, the T1 wires have a single delta channel and 23 bearer channels. Because of these multiple channels, PRI circuits allow multiple users to make calls or transmit date simultan.

Typically, PRI lines reserve most channels for voice and use the rest for data and video. Each channel runs at 64 kbps. Because you own the physical architecture, there is no bandwidth to share between lines, so the 64-kbps speed stays constant no matter how many users call at once.

PRI lets multiple signals share one line using time-division multiplexing, where synchronized switches send signals one after another in an alternating pattern.

Primary Rate Interface is a versatile solution. You can customize your network architecture by incorporating an EPABX or IP PBX system.

An EPABX can automatically manage and route calls, while an IP PBX connects your voice system to a digital environment. You can also use PRI to connect two IP PBX environments.

PRI oferă servicii la nivel de întreprindere

Primary Rate Interface creates a multiplex solution that allows businesses to host their own phone system. Due to the upfront cost of installing the copper wires, it is not a common solution for residential applications.

A PRI system is ideal for businesses where many employees must be on the phone at once. Up to 23 employees can make or receive calls at the same time with no drop in speed or call quality, and the line can still carry data and video.

A single PRI line can serve laptops, desktops, and phones, which is convenient as more businesses adopt BYOD policies.

Caracteristici ale interfeței Primary Rate

The graphic below highlights the core features that make a PRI line attractive to businesses. The features of a PRI system include:

• Acceptă mai mulți utilizatori: Multiple users can be on a line simultaneously without compromising call quality or speed.
• Utilizatorii dețin aceste Servicii integrate DigiRețelele tale: Niciun furnizor nu controlează lățimea de bandă sau configurația.
• Presetari de viteza: PRI circuits have a preset speed that does not fluctuate with usage.
• Opțiune de backup disponibilă: You can install a second PRI circuit and use it as a backup if a business needs a redundancy solution.
• Integrați cu instrumente de afaceri digitale: A PRI network can integrate with digital business tools when connected to an IP PBX system. For instance, integrating these phone systems with a Instrument CRM este un caz de utilizare comun.

Avantajele unui sistem telefonic PRI

Here are a few pros and benefits of PRI systems:

• Este rentabil: A PRI circuit carries multiple lines, so you pay one circuit charge instead of a separate charge for each line to the PSTN.
• It is secure and safe: Since the environment is not digital, there is a lower risk of malicious individuals intercepting data packets in transit, and malware cannot target PRI circuits.
• Fără pierderi de pachete: Because PRI does not depend on bandwidth, packet loss is not an issue, so call quality holds even during many simultaneous calls.
• Direct Inward Dialing (DID): With direct inward dialing, you can assign an individual phone number to each employee.
• Supports call hunting: You can connect an inbound call to a succession of lines until someone answers. It is an advantage for call centers.
• It is a scalable solution: You can add more PRI circuits as needed. Businesses typically end up with a few unused lines and some room for growth with each new PRI circuit.
• Include funcții precum ID-ul apelantului sau Apelarea directă către exterior (DOD): These features can be useful for a call center or sales department.

Dezavantaje PRI

Here are a few cons and drawbacks of PRI systems:

• Cost si intretinere: Since it is a physical network installed on-premises, there is an upfront cost and ongoing maintenance.
• Conexiune fizică necesară: Users must have a physical connection to the network. This means PRI is not a good fit for remote work or employees who travel frequently.
• Limitări de viteză: The preset line speed means each channel cannot exceed 64 kbps. Call quality can also drop if you do not have good phone service.

PRI vs. Trunking SIP

For businesses looking to upgrade their integrated communications solutions, it is important to compare the available options. The table below shows how PRI compares to SIP trunking:

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