Technical data

32 Chapter 3 Hardware installation
NN40170-308
BRI integrated ports (BCM50b, BCM50ba, and BCM50be)
The digital BRI ISDN lines are connected to the BCM50b, BCM50ba, and BCM50be main units
through the BRI ports (RJ-45) on the front of the main units. See the figure BRI ports and pin out
(BCM50b shown) on page 33.
The figure BRI ports and pin out (BCM50b shown) on page 33, the table BRI port wiring on page
33, and the table BRI line numbering on page 33 apply to S-Loop and T-Loop connections.
S-Loop are used to connect S-Loop devices such as video phones, terminal adapters, and Grp 3
Fax machines. The T-Loops are used to connect to the CO/PSTN.
17
42 Tip Yellow-Orange
Digital
telephone
409 229 —
17 Ring Orange-Yellow
18
43 Tip Yellow-Green
Digital
telephone
408 228 —
18 Ring Green-Yellow
19
44 Tip Yellow-Brown
Digital
telephone
407 227 —
19 Ring Brown-Yellow
20
45 Tip Yellow-Slate
Digital
telephone
406 226 —
20 Ring Slate-Yellow
21
46 Tip Violet-Blue
Digital
telephone
405 225 —
21 Ring Blue-Violet
22
47 Tip Violet-Orange
Digital
telephone
404 224 —
22 Ring Orange-Violet
23
48 Tip Violet-Green
Digital
telephone
403 223 —
23 Ring Green-Violet
24
49 Tip Violet-Brown
Digital
telephone
402 222 —
24 Ring Brown-Violet
25
50 Tip Violet-Slate
Digital
telephone
401 221 —
25 Ring Slate-Violet
Warning: For a U-loop connection, the BRI port must be connected only to an NT1
provided by the service provider. The NT1 must provide a Telecommunication Network
Voltage (TNV) to Safety Extra Low Voltage (SELV) barrier.
Table 12 RJ-21 telephony connector wiring (Sheet 2 of 2)
Device Pin Connection Wire color Type of device Port Default DN
Default line
number