Verizon's Unbundled PRI ISDN Line Port is used to enable end-to-end digital connectivity for transmitting voice and data simultaneously. The port provides a DS1 electrical interface to our local switch.
The following PRI ISDN Line Port features are available when applicable guidelines are met:
Wherever appropriate facilities are available, a PRI ISDN Line Port is provisioned on a first come, first served basis. The port terminates in a Verizon central office collocation arrangement.
For a base port, 24 DS0 64 Kbps channels are configured as 23 64 Kbps B channels for voice and circuit switched data traffic and a 64 Kbps D channel for out-of-band B channel signal control.
The Primary Rate ISDN Port provides a DS1 level electrical interface to the local switch for the provision of 24 DS0 64 Kbps channels. The service terminates in a collocation arrangement only. The base configuration consists of 23 64 Kbps B channels for end user voice and/or data traffic and one 64 D channel for out of band signaling control of the B channels. The Primary Rate ISDN Port provides access to the functions and capabilities of the local switch data functions. The full complement of channels will always be present at the physical network interface. All channels can simultaneously support independent applications. B channels are capable of supporting Voice and Circuit Switched Data. The D channel controls all B channels Voice and Circuit Switched Data.
ISDN Primary Port Service will be offered throughout Verizon where facilities are available. The service will be provided on a first come first served basis. If facilities are not available then the request will follow the held order procedure.
The CLEC is charged the full price of the port at activation for the multi-channel ports of PRI, whether or not all of the channels are activated. Usage charges also apply.
Pricing and applicable USOCs may vary by state jurisdiction and pursuant to individual carrier interconnection agreements. See your federal and state tariffs for detailed information.
This feature allows a D channel on a second interface at the same premises to be designated “standby” to carry signaling information for all the B channels on the first and subsequent interfaces. In the event of a failure of the ISDN Primary service D channel (due to interface or equipment malfunction), the Backup D assumes the signaling and control functions of the out of service D channel. (If a CLEC selects Backup D it also needs to subscribe to Multiple Facility Signaling Control.)
This arrangement can be provided only when the CLEC supplies the facilities to terminate to their end user's premises.
This feature delivers the calling party's telephone number (if available) to the ISDN Primary Service subscriber. If the originator of the call has exercised the option of blocking the display of its number, a private indication is delivered to the end user's premises. The number is delivered if the call originates either in the same node as the ISDN Primary Service or is appropriately connected to the ISDN Primary Service node by Signaling System 7. This feature is provided per port.
This feature allows some or all B channels to be dedicated with respect to capability and call type (DOD, DID). Multiple fixed channel trunk groups are established on the same interface (T1). The CLEC needs to specify the number of fixed B channels and their purposes.
This feature allows the D channel of one ISDN Primary Rate Service interface to provide signaling for the B channels of another interface, provided that they terminate on the same premises. One D channel can control up to twenty interfaces (up to 479 B channels). The CLEC must also subscribe to Backup D channel.
Integrated Services Digital Network (ISDN) is a switched network capability that supports services that are designed to provide end-to-end digital connectivity for the simultaneous transmission of voice and data.
PRI service consists of a 4-wire DSX-1 port associated with a local switching system and the 4-wire DSX-1 cross-connect between the OTC DSX-1 termination and the local switching system DSX-1 termination.
PRI ports are DSX-1 interfaces that meet the electrical specifications in ANSI T1.102. PRI service and use B8ZS line code and the Extended Superframe Format (ESF) described in ANSI T1.403.
PRI is synchronized by the Verizon local switching system that uses timing that is traceable to a stratum one timing supply. The associated Building Integrated Timing Supply (BITS) meets the 3E specifications in ANSI T1.101.
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