Patton electronic 2073RC - Manual (Page 13)

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DTE Shield (M/34 Pin A) & FRGND (JB3). In the connected position,
this strap links M/34 pin A & frame ground. In the open position, pin A is
disconnected from frame ground (see Table 2).
SGND & FRGND (JB4). In the connected position, this strap links Signal
Ground and frame ground through a 100 ohm resistor. In the open posi-
tion, signal ground is disconnected from frame ground (see Table 3).
Model 1001RCM11548C Strap Settings
Figure 6 on page 14 shows strap locations for the Model
1001RCM11548C (DB-15) rear cards. These straps determine various
grounding characteristics for the terminal interface and twisted pair lines.
JB3 and JB4 are user configurable.
Table 2: JB3 strap settings
Position Description
1 & 2 DTE Shield (Pin A) and FRGND Connection
2 & 3 DTE Shield (Pin A) and FRGND Not Connected
Table 3: JB4 strap settings
Position Description
1 & 2 SGND and FRGND Connected
2 & 3 SGND and FRGND Not Connected