Section I.3.3 - Local ISDN Primary Rate Interface (Local ISDN-PRI)
Local ISDN-PRI is an alternative arrangement for individual local exchange services such as Local Trunk - Basic and Local Trunk - DID. Local ISDN-PRI is provisioned at the 1.544 Mbps rate via the Primary Rate Interface standard of the Integrated Services Digital Network (ISDN). Local ISDN-PRI provides the Customer with the capabilities of simultaneous access, transmission and switching of voice, data and imaging services via channelized transport. Non-recurring charges, monthly recurring charges, usage charges, and optional feature charges including DID blocks are as specified the Local Rates and Charges section of the intrastate portion of the Guide and apply per T-1 unless otherwise noted. The Local ISDN PRI T-1 non-recurring and monthly recurring T-1 charges include Service Configuration and B Channel service charges.
3.3.1 Rate Options.
A. Flat Rate Option: Customers electing this option may make unlimited local calls. However, in some states, as detailed in Local Rates and Charges, there is a per minute use charge for local usage in excess of 60,000 minutes.
B. Measured Rate Option: This option is only available to Verizon Business Services (VBS) I, or VBS II circuits installed prior to July 1, 2007.
3.3.2 Local ISDN-PRI Service Arrangement ‑ One or more Service Configurations can be combined to create a Local ISDN-PRI Service Arrangement. Customers may have multiple Local ISDN-PRI Service Arrangements per location, however for each Service Arrangement one Service Configuration 1 must be included. The controlling D channel will always reside on Service Configuration 1. The D channel is a 64 Kbps channel that carries signaling and control for the B channels. The capabilities of the D channel are contained within the customer’s Service Configuration.
A. Service Configuration 1 ‑ The first Service Configuration for any Local ISDN-PRI Service Arrangement must be a Service Configuration 1. Service Configuration 1 provides twenty‑three (23) 64 Kbps B channels and one (1) primary 64 Kbps D signaling channel. The primary D channel is an‑out‑of band signaling channel used to control and route all of the B channel traffic within the Local ISDN-PRI Service Arrangement.
B. Service Configuration 2 ‑ This configuration is only available in conjunction with Service Configuration 1. It provides an additional twenty‑four (24) 64 Kbps B channels which are controlled by the D channel on Service Configuration 1. Multiple Service Configuration 2s may be associated with a Service Configuration 1 subject to switching equipment limitations. The bearer (or B) channels are used for information transfer between users. B channels provide the same features as Local Trunk Basic and Local Trunk DID. To receive the DID capability, customers must order separately DID telephone numbers, as found in the Local Trunk provisions.
C. Service Configuration 3 ‑ This configuration is also only available to subscribers who have a Service Configuration 1. It provides a backup 64 Kbps D channel and twenty-three (23) additional 64 Kbps B channels. The backup D channel will control and route all of the B channel traffic of a single PRI Service Arrangement in the event the D channel on the primary configuration (Service Configuration 1) fails. A maximum of one Service Configuration 3 may be included with each Local ISDN-PRI Service Arrangement. Service Configuration 3 is available subject to switching equipment capabilities. The bearer (or B) channels are used for information transfer between users. B channels provide the same features as Local Trunk Basic and Local Trunk DID. To receive the DID capability, customers must order separate DID telephone numbers, as found in the Local Trunk provisions.
3.3.3 Optional Features: In addition to providing Local Exchange Services specified above, Local ISDN-PRI can be configured to support the following optional advanced ISDN feature:
Caller ID With Name (Inbound)