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SGND & FRGND (JB4)
In the connected (closed) position, this strap links DB-25 pin 7 (Signal
Ground) and frame ground. In the open (disconnected) position, pin 1 is
“lifted” from frame ground (see Table 22).
RJ-45/RJ-11 & RJ-45/RJ-45 Strap Settings
Figure 6 shows strap locations for the Model 1000RCM1D11 (RJ-45/RJ-
11) and the Model 1000RCM1D45 (RJ-45/ RJ-45) rear cards. These
straps determine various grounding characteristics for the RS-232 and
twisted pair lines.
Figure 6.
RJ-45/RJ-11 & RJ-45/RJ-45 strap locations
Table 22:
SGND & FRGND (JB4) Settings
JB4
Position 1&2 = SGND (pin 7) and FRGND Connected
Position 2&3 = SGND (Pin 7) and FRGND Not Connected