Lucent Technologies DEFINITY Installation For Adjuncts And Peripherals page 146

DEFINITY ECS Release 8.2
Installation for Adjuncts and Peripherals 555-233-116
9 DS1/T1 CPE Loopback Jack
Loopback Testing Without a Smart Jack
1. Span section 1
2. Span section 2
3. 120A2 (or later) ICSU
4. RJ-48 to network interface (up to 1000 ft [305 m])
Figure 37. Network Interface at "Dumb" Block
5. Loopback jack
6. Dumb block (demarcation point)
7. Interface termination or fiber
multiplexer (MUX)
8. Central office
Issue 1
April 2000
124