ISDN-BRI Connection A TN556 ISDN-BRI circuit pack and a TN778 packet control must be in place. The TN778 packet provides packet bus control. An adjunct or a host processor must be in place to receive the request and to select the route. You can use a TN2198 two-wire BRI port circuit pack in place of the TN556 circuit pack. In this case, an NT1 is also required. Packet Bus You must set Packet Bus to y, which is G3r only, on the Maintenance-Related System Parameters screen before you administer the associated ISDN-BRI screens and fields. |