Setting BRI for ISDN device connections 289Programming Operations GuideSetting BRI for ISDN device connectionsBRI S-loops support devices that use an ISDN interface. You can assign a single device to a loop,or multiple devices connected through an NT-1 interface (“Using an NT-1 for BRI U2/BRI U4” onpage 278).• You can assign a maximum of eight devices to a loop.• Any device can only be configured to one loop.• S-loops do not supply any voltage for ISDN devices requiring power, such as video cameras.Voltage for these devices must be supplied by an external source on the S-loop.Wiring internal connectionsThe following diagram shows how to wire the BRI to connect to such S-Loop devices as videophones, terminal adapters, and Grp 3 Fax machines.Figure 76 BRI RJ45 wiring array8 7 6 5 4 3 2 1BRI connectorRJ45 socketsPin #/connection System side1 not used2 not used3 +RX4 +TX+TX+RX5 - TX6 -RX- RX-TX7 not used8 not used
