Technical information

Installation
227
Note: RJ21X is a standard trunk.
RJ2EX is a two-wire E&M trunk.
RJ2GX is a four-wire E&M trunk.
42 Y-O T T T1
17 O-Y R R R1
43 Y-G T E E
18 G-Y R M M
44 Y-BR T T T
19 BR-Y R R R
45 Y-S T E T1
20 S-Y R M R1
46 V-BL T T E
21 BL-V R R M
47 V-O T E T
22 O-V R M R
48 V-G T T T1
23 G-V R R R1
49 V-BR T E E
24 BR-V R M M
50 V-S SPARE
25 S-V SPARE
Table 47: USOC Connector Pin Designations (continued)
Pin Color RJ21X RJ2EX RJ2GX
(Sheet 2 of 2)