Nortel Networks BCM1000 - Manual (Page 263)

Chapter 18 Adding or replacing a cooling fan 263
Installation and Maintenance Guide
4 Remove the fan cable from wherever it is connected. Refer to Figure 121 and Figure 122 .
Figure 121 Remove the fan cable from motherboard (pre-2.5 chassis)
Figure 122 Remove the fan cables from SSM board (2.5 models)
Power supply cable
Fan cable
SSM board
J7 J6
Fan connectors