Do not use an ethernet or network crossover cable as these are different to an isdn crossover cable. A distribution box can be used to help organize the wiring when wiring a homeoffice with a pabx as each extension has to be wired back to one point.

What Is Isdn What Are Its Advantages Updated
Isdn wiring diagram. The above diagram shows an ethernet crossover cable pin out for reference. To the isdn termination jack. Standard cat5 utp unscreened twisted pair cable is recommended for all types of telephone station wiring and should always be used for isdn cabling applications. Should you need to make one of these cables up please use the diagram below as a reference. In the first diagram a cat 5 outlet is used with a cat 5 patch cord as a simple way to connect the extension wiring to the linebox. However for network cabling cat5 is recommended.
In the second diagram cat 5 outlets are daisy chained from the linebox. Att 555 021 101 issue 3 february 1993 isdn installation and test manual b b 1 1993 att. Normal telephone cable is used for isdn or telephone sockets and can be used for networking. The two interfaces shown are bri and pri. As there is only one socket on the extension wiring this may extend as far as 800m. These can also be used for network 10base t cabling.
Wiring up isdn cable. Usually this is the case when an isdn line is provided from a phone system. The digital channels for the bri are carried over a single unshielded twisted pair of copper wires and the pri is normally carried on 2 twisted pairs of copper wire. Cat5 cable is color coded in pairs and each pair consists of two wires twisted together within the cable. This diagram shows the different interfaces that are available in the integrated services digital network isdn.