
Preparing for Installation
114948-A Rev. A 1-15
*. These jumpers determine the output voltage levels on the unbalanced driver devices. We
recommend that you leave the jumpers in the ±12V position for correct unbalanced
operation.
† When configuring for V.35, place the S10 and S11 jumpers (A through E) in the unbalanced
position to support V.35/V.28 control signals.
Table 1-4. Dual Sync/Dual Ethernet High-Speed Filters
Jumper Settings
Option Setting Jumper
Interface voltage ±5 or ±12 ±12 for RS-232, V.28, V.35
±5 for RS-423*
Com 1 Unbalanced signal for
RS-232, RS-423, V.28†
Balanced signal for X.21*
Balanced signal for
RS-422*
Com 2 Unbalanced signal for
RS-232, RS-423, V.28†
Balanced signal for X.21*
Balanced signal for
RS-422*
S7
S8
S7
S8
S11
E
A
S10
S10
S10
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