Sample Delay Test

Use this test mode to measure the delay between the primary Tx and Rx ports. This measured delay can be used to determine the approximate distance between near end and the far end. The far end of the line must be manually looped during this test. Since a signal is being sent on the T1 line, service on the T1 will be affected.
In this example, you can use this test mode to have the test set measure the round trip delay of a T1 circuit. It is necessary to have a loop condition at the far end during this test. The best accuracy is obtained when a hard loop exists at the far end. The far end CSU can be remotely looped up using the CSU/NIU Loopback mode, however, be aware that the loopback method in the remote device could add additional delay. During this mode a pattern consisting of a zero inserted into a string of ones is transmitted and analyzed to determine the delay in the path. The selected test pattern is sent as filler during the calculation interval.
Sample Delay Test

Step
 		Notes
1
 		Connect the BSTS to the DSX panel
 		Refer to the Measurement Guide
2
 		[Mode]
3
 		[Backhaul]
4
 		[T1 Analyzer]
5
 		Select a test mode.
  1. [Get Started/ Test Mode]
  2. [Delay]
  3. [Full T1]
Choose this to perform a Delay test on a full T1 Circuit. Delay measurements require full T1 bandwidth.
6
 		[Setup]
 		Select this to display a list of setup choices that pertain to this test mode.
7
 		Setup Rx input.
  1. [Rx Input]
  2. [Terminate]
This assumes the test set is connected into a jack that interrupts the circuit.
8
 		Setup line code.
  1. [Line Code]
  2. [B8ZS]
This assumes the circuit is designed for B8ZS.
9
 		Setup framing.
  1. [Framing]
  2. [ESF]
This assumes that the circuit has been designed for ESF.
10
 		Select a pattern.
  1. [Pattern]
  2. Use the up and down buttons to select.
  3. QRSS
  4. [Select]

11
 		Setup Tx LBO.
  1. [Tx LBO]
  2. [0 dB]
This is a typical level found at the customer demarcation point.