Patapsco's Liberator ISDN converter product range offers a very wide range of ISDN conversion options, some PRI to BRI examples are shown below.

The requirements for an ISDN PRI to BRI ISDN converter cover a number of applications:

1. Depending where you are located, PRIs can be much less expensive to install and rent than multiple BRIs
2. You may have other telecoms products which are incompatible with existing interfaces
3. PRI is available and low cost but local equipment presents BRIs
4. Quite often customer devices requiring BRI interfaces do not need access to the network all the time. This can lead to an inefficient use of BRI ports and the associated extra installation and rental expense. Using a converter can save installation and rental charges
5. BRI ports can be a little unreliable and many customers find they have "disappeared" when they come to use them. It is not possible to establish if a BRI is working until a call is placed but a PRI circuit is monitored continually
6. Or perhaps space and cabling are an issue with many BRIs where a PRI would be easier to install and manage

Need a multiple PRI switch? See the Liberator "D"

Liberator can convert and deliver BRI ports from a PRI or fractional PRI circuit.

If required, Liberator can offer more local BRI ports than network ports. Local devices contend for the capacity on the assumption that not all BRIs are in use at the same time. This can save considerable sums of money.

Potential advantages are:

• ISDN conversion reduces rental costs through lower cost PRI and/or contention
• PRI conversion offers a more reliable service as it is continually monitored, unlike BRIs
• The Liberator ISDN converter provides simplified cabling and billing

The Liberator DUO can provide BRI "U" interfaces as well as "S" BRIs - the complete ISDN converter.

The diagrams below show "U" interfaces connecting directly to local ISDN devices or extending ISDN over long distances.

The low-cost Liberator ISDN converter can also connect incompatible devices, making an installation possible where it was not before.

Liberator is often used with VoIP and Mobile gateways

The diagram below shows a PRI Mobile Gateway with just a PRI interface, connecting to a PABX with BRI ports. See more applications showing Liberator's multiple PRI capability or in the product section.

Patapsco's Liberator products can also deliver local PRIs where needed (see diagram below) and this is covered on a separate Application page describing Sharing PRIs.

Do you want to do the opposite of above and use BRIs from the network to deliver a local PRI?

Links to Products for this application:

PRI to BRI application note
Sharing PRI application note

Liberator "S"

• 1, 2 or 3 E1/T1 PRIs (to the network or to local devices)
• 4, 8,12 or 16 BRI "S" 4-wire ports
• Optional Power Feed for non-powered ISDN devices such as simple telephone sets
• ISDN conversion between any ISDN "B" channel

Liberator "D"

• Modular distributable multiple PRI system
• Multiple 4 PRI "Elements"
• Build a PRI cros
• Optional Powes-connect switch of 4 - 64 PRIs
• Non-blocking archetecture
• E1/T1 and A-Law to u-Law conversion
• Very flexible routing options

The above two products come with up to 16 BRIs. For applications requiring more ports we can either cascade Liberators or look at the DB120 chassis.

Links to other relevant applications pages:

BRI conversion

• Convert a PRI network port to multiple BRIs with or without local PRIs

ISDN Simulator or ISDN Emulator

• Simulate BRI and/or PRI for testing, training and demonstrations

T1 to E1 ISDN Conversion

• Convert between T1 ISDN and E1 ISDN

PRI Sharing

• Share a PRI between more than one local PRI, with/without BRIs as well.

See also the drop-down menu at the top right of these pages

If you need any assistance, you can use our on-line help or chat facility in the toolbar above, or contact us via different means.