User's Manual Part 2a

Hardware Installation Guide Installing the BSDU

02030311-05 Airspan Networks Ltd. 5-9

5.7. Daisy-Chaining BSDUs

You can daisy chain up to four BSDUs at each base station. When you daisy chain

BSDUs, you need to connect the 100Base-T ports between BSDUs using a

crossover cable.

! Connector: 8-pin RJ-45

! Cable: RJ-45-to-RJ-45 crossover

! Connector pinouts: The following table describes the pinouts of the RJ-45

connectors on opposite sides of the crossover cable:

RJ-45 (one end) RJ-45 (other end)

Pin Name

Description

1 Tx+ Transmit Data+ 3

2 Tx- Transmit Data- 6

3 Rx+ Receive Data+ 1

4 NC Not connected 4

5 NC Not connected 5

6 Rx- Receive Data- 2

7 NC Not connected 7

8 NC Not connected 8

To daisy-chain BSDUs:

1. On the first BSDU, connect the RJ-45 connector, on one end of the crossover

cable, to one of the two 100Base-T ports (labeled 100Base-T 1 or 100Base-T 2)

located on the BSDU’s front panel (see Figure 5-5).

2. On the second BSDU, connect the RJ-45 connector, at the other end of the

crossover cable, to one of the BSDU’s 100Base-T ports (labeled 100Base-T 1 or

100Base-T 2) located on the BSDU’s front panel (see Figure 5-5).

3. If there are additional BSDUs, simply continue connecting the BSDUs using the

100Base-T ports (see Figure 5-5).