Appendix L DSM16 and DSM32 wiring charts 239
BCM50 Installation and Maintenance Guide
Appendix L
DSM16 and DSM32 wiring charts
Digital telephones, such as the Business Series Telephones, connect to the Digital Station Module
(DSM16 or DSM32) through the RJ-21 connectors on the front of the media bay module. The
DSM16 has a single RJ-21 connector and the DSM32 has two RJ-21 connectors. See the figure
DSM16 and DSM32 RJ-21 connectors on page 239.
Figure 98 DSM16 and DSM32 RJ-21 connectors
The table DSM16 and DSM32 RJ-21 connector wiring on page 239 lists the wiring details for the
RJ-21 connectors on the DSM16 and DSM32.
Table 52 DSM16 and DSM32 RJ-21 connector wiring (Sheet 1 of 3)
Set Pin Connection Wire color
Default DN on Expansion
port 1
Default DN on Expansion
port 2
DSM16 or
Lower DSM32
RJ-21
Port
Upper DSM32
RJ-21
Port
DSM16 or
Lower DSM32
RJ-21
Port
Upper DSM32
RJ-21
Port
1
26 Tip White-Blue
237 501 253 601 269 701 285 801
1 Ring Blue-White
2
27 Tip White-Orange
238 502 254 602 270 702 286 802
2 Ring Orange-White
3
28 Tip White-Green
239
503 255 603 271 703 287 803
3 Ring Green-White
RJ-21 pin out
RJ-21 connector
DSM16
RJ-21 connectors
DSM32
