ISDN Features350 Features Guide2.1 ISDN FeaturesIntegrated Services Digital Network (ISDN)DescriptionIntegrated Services Digital Network (ISDN) is a hierarchy of digital switching andtransmission systems. ISDN transmits voice, data, and image in digital format. It issynchronized so all digital elements speak the same language at the same speed.[ISDN Interface]ISDN provides the following two interfaces:•Basic Rate Interface (BRI)BRI provides 2 B channels (64 kbps for each) for data transmission and 1 D channel (16 kbps)for signaling (2B + D).•Primary Rate Interface (PRI)PRI provides 23 B channels (64 kbps for each) for data transmission and 1 D channel (64 kbps)for signaling (23B + D).[System Hardware Requirements]To interface the KX-TD500 System with ISDN, one of the following two trunk cards isrequired depending on the ISDN interface type.•KX-TD50288 (BRI Card) for Basic Rate Interface•KX-TD50290 (PRI23 Card) for Primary Rate Interface[Access Mode]The KX-TD500 System can handle calls from ISDN with Point-to-Point (P-P) or Point-to-MultiPoint (P-MP) access mode or both. The PRI23 Card (KX-TD50290) is available for P-Paccess mode only.Point-to-Point (P-P) access modeA call from ISDN with DID (Direct Inward Dialing) number is directed to a specific regularextension (with DN) or virtual extension (with FDN) directly after translation of the DID(ISDN) number.DID (Direct Inward Dialing) (ISDN) ConfigurationPoint-to-MultiPoint (P-MP) access modeIf Multiple Directory Number (MDN) service is contracted with the Central Office, up to eightextensions or terminals or both can be connected to one ISDN BRI line. A different DN isassigned to each extension or terminal. A call from ISDN is directed to a specific regularExt.1112 (DID:1111)Ext.1212 (DID:1112)Ext.1312 (DID:1113)ISDNCalled No.555-1111 - 1113TD500
