Nortel DMS-10 Series Installation, Operation And Maintenance Manual page 575

Figure 3-1
Quad SIO PCA (NT6M60BA) peripheral switches and indicators
Note: Do not set these switches (S6-1, S6-2, S6-3, and S6-4) to the On position. This switch
and LED are not active in this configuration; all S6 switch settings (1 through 4) must be off.
BMC II BISYNC Operation, Administration, and Maintenance Guide BMCB001 and up
Section 060-INDP-610 Maintenance Procedures Guide 6-137
Quad SIO Card
Transfer
Select Switch
S6
Channel 4
Channel 3
Channel 2
Channel 1
Channel 4 LED
Channel 3 LED
Channel 2 LED
Channel 1 LED
SWITCH S6 CHANNEL POSITIONS
POSITION
FUNCTION
NORMAL
FORCED
STAND-BY
ON
LED
OFF
OFF
ON ON