Section 700 - Operation Chapter 3. System FeaturesS-ICX-50-700 S-ICX (International) issued October 2000 63Trunk Interface - DDI (Not Available on UK, TX or EX Model)The DDI feature allows an extension to have a dedicated direct number. The dedicated number allowscalls to be made directly to the extension, without the caller going through the attendant.The DDI number may have from 1 to 4 digits (typically 4).Each DDI Trunk Interface card (VB-44520) supports up to 8 DDI trunks.Hardware Requirements• The -48V power supply is required.Considerations• The DDI Trunk card supports 1 to 4-digit dial-pulse (10 pps) or Dual Tone Multifrequency(DTMF) signalling.• DDI numbers must be between 0 and 9999.Trunk Interface - ISDN BRIThe System supports ISDN BRI with the VB-44530 ISDN BRI interface unit. The VB-44530 is a T-Point ISDN-BRI that supports 2 B (bearer) channels and 1 D (data) channel (2B + D; 144kbps or192kbps). This unit connects to an ISDN Data Service Unit (DSU). Point-to-point and point-to-multioperations are selectable.The ISDN-BRI supports enblock setting and enblock setting at the sub-address.Hardware Requirements• N/AConsiderations• A DSU is required (not available from Panasonic). Normally the DSU is supplied by thetelephone service provider.Trunk Interface - ISDN-PRIThe System supports ISDN PRI with the VB-44540 ISDN PRI Interface unit. The VB-44540 is a T/S-Point ISDN PRI that supports 30B (for UK) or 23B (for HK) (bearer) channels and 1 D (data) channel(30B + D; 2M) (23B + D; 1.5M). This unit connects to an ISDN DSU.A maximum of 1 ISDN-PRI unit may be installed in an S-ICX system with a CPC-HS. Up to 2 ISDN-PRI units may be installed in an S-ICX system with a CPC-HM.Hardware Requirements• N/AConsiderations• N/ATrunk Interface - Loop StartThe VB-44510UK Loop Start interface unit supplies 8 loop start analog exchange line circuits. Inaddition, the VB-44510UK Loop Start interface unit may alternatively be used to connect to loop startexchange lines.
