Controller Alarm Port Pinout; Network Service Units; Universal/R2 Nsu; Bri Nsu - Mitel 3300 Technician's Handbook

Controller Alarm Port Pinout

Table 61. Controller Alarm Port Pinout

Pin Signal
1
2
3
4
5

Network Service Units

The Network Services Unit provides connectivity to
digital trunks for public or private networks.
There are three variants of 3300 NSUs:
• Universal NSU
• R2 NSU
•

BRI NSU

Universal/R2 NSU

BRI NSU
Critical alarm
Critical Alarm Return
Not used
Major Alarm
Major Alarm Return

Figure 28. Universal NSU

Figure 29. R2 NSU

Figure 30. BRI NSU

Pin Signal
6 Not used
7 Minor Alarm
8 Minor Alarm return
9 Not used
243