CHAPTER 6
Diagnostic Testing for CTP Bundles
Overview
•
Serial Loops for CTP Bundles Overview on page 157
•
BERT Testing for CTP Bundles Overview on page 158
•
End-to-End BERT for CTP Bundles Overview on page 159
Serial Loops for CTP Bundles Overview
You can use serial loops to diagnose issues in your network. You set up serial loops in the
following directions:
•
Toward the serial interface and the attached customer device.
•
Toward the IP network and the remote customer device.
Serial loops may not run on transparent circuits. The serial loop function connects the
SD and RD signals of the interface (in the direction specified), and will work only if a
transparent circuit uses the SD and RD signals to transport data.
Normal Data Flow in the CTP Network
Figure 15 on page 157 shows the normal data flow through the network.
Figure 15: Normal Data Flow
IP network
g015431
CTP deviceCTP device
Customer
Equipment
Customer
Equipment
Serial Loop to the Serial Interface
Figure 16 on page 158 shows the data flow for a serial loop to the interface and the local
customer device.
The serial loop toward the interface loops data arriving from the serial interface that is
destined for the IP network back to the serial interface. The data is still transmitted from
157Copyright © 2018, Juniper Networks, Inc.
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