Juniper CTP Series User Manual

Using Send Timing (ST) Clocking for Higher Speed Circuits with Transparent Encoding
When the relationship between the clock and the data signals is critical, you can use ST
clocking with transparent encoding to prevent delay and jitter in CTP2000 series devices,
making it possible to carry higher speed circuits in transparent mode.
Figure 6 on page 16 shows the issue of delay and jitter where a transparent encoded
circuit connects a DCE to a DTE. The circuit is set up as follows:
•
The high-speed clock and data lines (shown in red) are aligned by a FIFO buffer at the
DCE.
•
The signaling leads (shown in blue) are passed end-to-end without going through the
FIFO buffer. The signaling paths that carry non-timing-critical signals are subject to
delay and jitter.
The problem is that when a FIFO buffer is used at one end of the circuit, an additional
clock path from the DCE to the DTE is needed to carry a clock to the DTE so that it can
return a DTE-to-DCE clock that is in phase with the data. This DTE-to-DCE clock is needed
to clock the FIFO input. Normally, one of the signal lead paths carries this transmit clock.
However, when the circuit is running at speeds above 32k, the delay and jitter on these
paths make these signal choices nonoptimal.
Figure 6: High-Speed and Low-Speed Paths with Transparent Encoding
g015403
Red = High-speed clock and data lines
Blue = Signaling lead
DCE
RTS
CTS
DTR
DSR
DTE
DTR
DSR
RTS
CTS
Transparent Circuit
FIFO
Delay/Jitter
Delay/Jitter
Delay/Jitter
Delay/Jitter
Transparent Circuit
To solve the issue of delay and jitter associated with the signaling leads, you can use the
ST interface signal to feed or sink the RTS-to-CTS signal path. By using the ST interface
signal instead of the RTS-to-CTS signal path, delay and jitter are removed from that
signal path. Figure 7 on page 17 shows a transparent-encoded circuit with the additional
ST functionality:
•
At the DCE, the RTS-to-CTS signal path is configured to use ST (as an input from the
DCE) to feed that signal path through the network.
Copyright © 2018, Juniper Networks, Inc.16
Using Bundles to Create Logical Configurations for Physical Interfaces, CTP Release 7.3, CTPView Release 7.3

Juniper CTP Series Specifications

General

Dimensions	Varies by model
Weight	Varies by model
Product Series	CTP
Port Density	Varies by model
Supported Protocols	Ethernet
Power Supply	Redundant, hot-swappable
Management	CLI, SNMP
Operating Temperature	0°C to 40°C
Storage Temperature	-40°C to 70°C

Summary

Chapter 1 Overview of CTP Bundles

Types of Bundles Overview

Details the different types of bundles and their applications and supported interfaces.

Serial Multiservice Interface Module Overview

Explains the Serial Multiservice Interface module and its supported modes.

Adaptive Clocking Overview for CTP Bundles

Explains the goal and types of adaptive clocking for CTP bundles.

Determining Optimal Packet Size for CTP Bundles Overview

Discusses factors for determining optimal IP packet size for CTP bundles.

Providing QoS for CTP Bundles by Using Service Type Overview

How to provide Quality of Service (QoS) for CTP bundles using service type.

Transparent Encoding Overview

Introduces transparent encoding and its applications, including modes and recommendations.

TDM/TDC Encoding Overview

Explains Time Division Multiplexing (TDM) and Time Domain Correlation (TDC) features.

Chapter 2 Configuring CTP Bundles

Adding a Bundle (CTPView)

Steps to add a bundle using the CTPView interface.

Configuring IP Parameters for CTP Bundles (CTPView)

How to set IP parameters for CTP bundles in CTPView.

Configuring Circuit Startup Parameters for CTP Bundles (CTPView)

Guide to configure advanced circuit startup options in CTPView.

Configuring the Direction of the Circuit (CTPView)

Steps to configure the circuit direction for CTP bundles in CTPView.

Configuring Serial Port Parameters for CTP Bundles (CTPView)

How to configure serial port parameters for CTP bundles in CTPView.

Configuring Transparent Encoding for CTP Bundles (CTPView)

How to configure transparent encoding for CTP bundles in CTPView.

Configuring Bundle Pairs for TDM/TDC Operation (CTPView)

How to configure high-speed and low-speed bundles for TDM/TDC operation.

Configuring T1 and E1 Port Parameters for CTP Bundles (CTPView)

How to configure T1 and E1 port parameters for CTP bundles in CTPView.

Configuring Multiservice Audio Mode Port Parameters for CTP Bundles (CTPView)

How to configure multiservice audio mode port parameters for CTP bundles.

Configuring Multiservice IRIG-B Mode Port Parameters for CTP Bundles (CTPView)

How to configure multiservice IRIG-B mode port parameters for CTP bundles.

Configuring IRIG-B Port Parameters for CTP Bundles (CTPView)

How to configure port parameters for IRIG-B daughter cards in CTPView.

Configuring Adaptive Clocking for CTP Bundles (CTPView)

How to configure adaptive clocking attributes for CTP bundles in CTPView.

Configuring NetRef Settings (CTPView)

How to configure NetRef settings for node synchronization in CTPView.

Chapter 3 Activating, Disabling, Deleting, or Recentering CTP Bundles

Activating, Disabling, Deleting, or Recentering CTP Bundles (CTPView)

How to change bundle status (activate, disable, delete, recenter) via CTPView.

Activating, Disabling, Deleting, or Recentering for CTP Bundles (CTP Menu)

How to change bundle status using the CTP Menu interface.

Chapter 4 Querying CTP Bundles

Displaying Running CTP Bundle Configuration, State, and Counters (CTPView)

How to view bundle configuration, state, and counters in CTPView.

Displaying the NetRef Node Synchronization Information (CTP Menu)

How to view NetRef node synchronization details using the CTP Menu.

Displaying the Running CTP Bundle Configuration, State, and Counters (CTP Menu)

How to view bundle configuration, state, and counters using the CTP Menu.

Chapter 5 Monitoring Packet Creation and Reception and Packet Delay for CTP Bundles

Using SCC Counts to Monitor Packet Creation and Reception for CTP Bundles (CTP Menu)

How to use SCC counts to monitor packet creation and reception via CTP Menu.

Using Buffer Sampling to Monitor Packet Delay for CTP Bundles (CTP Menu)

How to use buffer sampling to monitor packet delay via CTP Menu.

Chapter 6 Diagnostic Testing for CTP Bundles Overview

Serial Loops for CTP Bundles Overview

Overview of using serial loops for diagnosing network issues.

BERT Testing for CTP Bundles Overview

Overview of performing Bit Error Rate Tests (BERT) on bundles.

End-to-End BERT for CTP Bundles Overview

Overview of setting up end-to-end BERT tests for CTP bundles.

Chapter 7 Configuring Diagnostic Testing for CTP Bundles

Configuring Serial Loops for CTP Bundles (CTPView)

Steps to configure serial loops using CTPView.

Configuring BERT Testing for CTP Bundles (CTPView)

Steps to configure BERT tests using CTPView.

Chapter 8 Displaying BERT Status and Counters for CTP Bundles

Displaying BERT Status and Counters for CTP Bundles (CTPView)

How to view BERT status and counters in CTPView.

Displaying BERT Status and Counters for CTP Bundles (CTP Menu)

How to view BERT status and counters in the CTP Menu.

Chapter 9 Reducing the Number of SNMP Traps Generated for Late and Missing Packets

Reducing the Number of SNMP Traps Generated for Late and Missing Packets (CTP Menu)

How to reduce SNMP traps for late and missing packets using CTP Menu.