Nortel Networks DCT1900 manual Use of TDR, Determining the Delay of Remote Base Station Cable

Technical Product Manual - DCT1900

Installation Instructions, Use of TDR

CHAPTER 25

Use of TDR

25.1Introduction

When programming Remote Base Stations using the CSMW Software, it is necessary to determine the time delay of the Base Station cable. This is done using a TDR (Time Domain Reflectometer). See the following paragraph for instruction on how to measure the delay of the Base Station cable.

25.2Determining the Delay of Remote Base Station Cable

The following instructions explain how delay is measured using the Tektronix model 1503B or 1503C TDR.

Refer to Figure 25-1 for an illustration of the front panel controls. In this illustration, each control is numbered and the numbers are used to identify each control in the procedure that follows.

Fig.25-1 TDR Controls

1.Turn power on (7). When you see a horizontal trace and division marks on the screen, the TDR is ready to use.

2.Set Impedance (2) to 93 ohms.

3.Set Noise Filter (3) to 1 AVG.

4.Set Vertical Scale (4) to 0.00dB

5.Set DIST/DIV (5) to 100 ft.

6.Set Vp (6) to .99.

7.Set Pulse Width (8) to 100 nS.

8.Center the trace using the vertical POSITION control (9).

9.Connect the test cable (terminated with two alligator clips) to the input jack (1).

Install-DCT1900/R8/mw	25-1
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