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Table 23 provides an overview of strap functions for the modular/modular
cards. Following the table is a detailed description of each strap's func-
tion.
Line Shield & FRGND (JB2)
This strap pertains to the line interface. In the connected (closed) posi-
tion, this strap links RJ-11 pins 1 and 6, or RJ-45 pins 2 and 7 to frame
ground. These pins can be used as connections for the twisted pair
cable shield. In the open (disconnected) position, pins 1 and 6 (or 2 and
7) remain connected to each other, but are “lifted” from frame ground
(see Table 24).
SGND & FRGND (JB5)
This strap pertains to the DTE interface, which is a 10-position modular
RJ-45 jack. In the connected (closed) position, this strap links modular
pin 5 (Signal Ground) and frame ground. In the open (disconnected)
position, pin 5 is “lifted” from frame ground (see Table 25).
Table 23:
RJ-45/RJ-11 & RJ-45/RJ-45 Interface Card Strap Summary
Strap Function Position 1&2 Position 2&3
JB2 Line Shield & FRGND Connected Open*
JB5 SGND & FRGND Connected Open*
JB6 DTE Pin 2 DSR* RI
Table 24:
Line Shield & FRGND (JB2) Settings
JB2
Position 1&2 = Line Shield and FRGND Connected
Position 2&3 = Line Shield and FRGND Not Connected
Table 25:
SGND & FRGND (JB5) Settings
JB5
Position 1&2 = SGND (pin 5) and FRGND Connected
Position 2&3 = SGND (pin 5) and FRGND Not Connected