Hardware Technical Reference Manual
The R2 NSU rear panel consists of the following components:
• Message Link DIP switch for designating a unit number (1 or 2) when two NSUs are chained
together
• Two E1 ports for network connection
• Two E1 port status LEDs
• Two E1 port DIP switch complexes
• Protective ground for grounding the chassis
• Standard Male IEC AC input power connector.
Basic Rate Interface Network Services Unit
The BRI NSU provides connectivity for Basic Rate ISDN (BRI) transport of both data and voice
traffic. This unit is available in North American and European variants. The North American
variant supports user-side interface. The European variant supports both network and user-side
interfaces.
The BRI NSU supports 15 BRI U-interfaces per unit. It does not connect directly to a 3300 ICP
controller, but rather to the Universal NSU through a copper cable.
Fifteen interfaces are programmed for line support in the NA product and line or trunk support
in the UK version. The BRI NSU protocols are
• Euro-ISDN 2B+D, Basic Rate Interface
• North American National ISDN-1
• North American National ISDN-2.
Figure 23: R2 Network Services Unit Rear Panel
Note: UK BRI will drive power to the BRI circuits; NA BRI will not.
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