User's Manual

32 UltraWAVE Micro BTS Installation and Commissioning Guide, Version B
Chapter 2 - Installation
2.3.1 Configuring Ground Jumpers on 75 Ohm
E1
Cards
To configure the ground jumpers on a 75 Ohm E1 card:
1 Ensure that anti-static precautions are taken. Refer to Section 1.2 for
anti-static precautions.
2 Make note of the orientation of the cables and disconnect them from the
selected card.
3 Using a Phillips screwdriver, fully loosen the two captive screws located at the
top and bottom of the card.
4 Remove the card by firmly pulling the two white tabs located at the top and
bottom of the card.
5 See Figure 2-6 to locate jumpers P8 through P11.
6 Set the signal grounding to the Transmit or Receive Side.
Jumpers P8, P9, P10 and P11 control the signal grounding. Placing the jumper
across Pins 1 and 2 sets the corresponding ground; otherwise the jumper
should be placed across Pins 2 and 3.
The following table shows the jumper assignments:
Alvarion recommends grounding the receive (RX) side on 75 Ohm cards.
7 Place the card into the slot and slide in the card until it completely rests inside
the slot. Push the card firmly into place.
8 Using a Phillips screwdriver, tighten the two captive screws.
Table 2-8: Ground Jumpers
Ground Selection Port Jumper Positions
Receive Side
Port 0 P8 = 1 to 2 P9 = 2 to 3
Port 1 P10 = 2 and 3 P11 = 1 and 2
Transmit Side
Port 0 P8 = 2 to 3 P9 = 1 to 2
Port 1 P10 = 1 and 2 P11 = 2 and 3
Only one side of the transmission link should be grounded. To
ensure that only the one side is grounded, you should check the
settings at the far end of the E1 transmission link when possible.
These settings should be identified by experienced personnel.