User Manual

DXUDistribution Switch Unit
Test Interface
The test interface is used for taking measurements from the RBS. The signals
include
• Three TU signals (13 MHz sinus frequency reference output, 270 kHz
airbus clock and airbus framesync)
• Six local bus signals (up- and down-link data for A and B channels, Clock
and Framesync)
• Four pairs of G.703 signals (up- and down-link data for A and B channels)
• Internal +5 V and +3.3 V
• Reset and signal ground
The test interface is a 3 x 7 pin male connector unit. For information about the
test connector pins, see the table below.
Table 6 Test Connector Pins
Pin
Left column
Middle column Right column
1 G.703.2A_UP GROUND G.703.2A_UP
2 G.703.2A_DOWN RESETNEG G.703.2A_DOWN
3 G.703.1A_UP +3.3 V G.703.1B_UP
4 G.703.1A_DOWN +5 V G.703.1B_DOWN 5
5 LB.DDB
(1)
LB.DUB
(2)
LB.SYNC
(3)
6 LB.DDA
(4)
LB.DUA
(5)
LB.CLK
(6)
7 TU.13MHZSIN
(7)
TU.270KHZ TU.FSYNC
(1) Local Bus Data Down B
(2) Local Bus Data Up B
(3) Local Bus Synchronization
(4) Local Bus Data Down A
(5) Local Bus Data Up A
(6) Local Bus Clock
(7) Timing Unit
10 (12)
EN/LZT 720 0243 Uen R1A