IBM Nways 8260, Installation Manual

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Setting the Grounding Jumpers for E3/DS3 I/O Cards
To adhere to country specific regulations regarding the grounding of outer conductors
on coaxial pairs (both receive and transmit ports), four jumpers are provided on the rear
of the E3/DS3 I/O cards. If the jumpers are not used, the outer connector is grounded
through a 10 nF capacitor. Figure 9 shows the location of the four jumpers.
Normally, only the outer connector of the transmit port is to be grounded, and not the
receive port. This depends on individual country regulations. Check to see whether
your country also requires the receive port to be grounded.
Transmit
Receive
JP6
JP5
JP8
JP7
Figure 9. Grounding Jumper Locations
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WAN 2/2.5 Modules: I/O Card Installation Guide