Avaya MCC1 Maintenance Procedures page 361

Figure 107: Network Interface at Smart Jack
Figure notes
1 Span Section 1
2 Span Section 2
3 Span Section 3
4 120A2 (or later) Integrated
Channel Service Unit (ICSU)
5 RJ-48 to Network Interface
(Up to 1000 Feet) (305 m)
Maintenance Procedures
December 2003
Additional maintenance procedures
6 Loopback Jack
7 Network Interface Smart Jack
8 Interface Termination or Fiber MUX
9 Central Office
DS1 CPE loopback jack (T1 only)
361