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Table 49: Clocking Type Supported for Each Encoding Type as Displayed in the CTP Menu
Encoding Type
NRZ and TDM with interface mode
set to DCE
NRZ and TDM with interface mode
set to DTE
Copyright © 2018, Juniper Networks, Inc.
Select 1) Port Clock Config.
6.
Configure the options as described in
7.
Clocking Type Supported
You can specify the following clocking methods for NRZ and TDM circuits with DCE
mode specified:
Custom—The custom clocking configuration is used.
Configured Rate, w/o Ext Tx Clk (TT)—Configured rate without external TX clock
(TT). The CTP device synthesizes the rate that is used on the ST and RT outputs to
the attached device. The ST is used to sample Send Data from the attached DTE.
The clock is created by the CTP DDS circuitry and logic. This option is commonly
used on circuits that are less than 1 Mbps.
Configured Rate, Ext Tx Clk (TT—Configured rate with external TX clock (TT). The
CTP device synthesizes the rate that is used on the ST and RT outputs to the attached
device. The clock is created by the DDS circuitry and logic. This option is used to
sample Send Data from the attached device. It assumes that the attached device is
using ST or clock reference that is traceable to CTP reference. It is typically used for
higher data rates (>1 Mbps) and long cables.
All Clocked by Ext Tx Clk (TT)—All clocked with external TX clock (TT). The CTP
device uses the external TT timing from the DTE for all clocking. Ext TT is used to
sample Send Data from the attached device, to generate the RT clock, and to clock
data into the IP network.
Adaptive Rate, Ext Tx Clk (TT)—Adaptive clocking with external TX clock (TT).
Adaptive Rate, w/o Ext Tx Clk (TT)—Adaptive clocking with internal clock.
Autobaud Rate, Ext Tx Clk (TT)—Autobaud rate with internal clock.
Autobaud Rate, w/o Ext Tx Clk (TT)—Autobaud rate with external clock.
TDM/TDC Interleaved Slow Port—Available only on odd-numbered ports. Use this
option for the low-speed port of a time domain correlation (TDC) circuit.
You can specify the following clocking methods for NRZ and TDM circuits with DTE
mode specified:
Adaptive Rate, Ext Tx Clk (TT)—Adaptive clocking with external TX clock (TT).
Adaptive Rate, w/o Ext Tx Clk (TT)—Adaptive clocking with internal clock.
Autobaud Rate, Ext Tx Clk (TT)—Autobaud rate with internal clock.
Autobaud Rate, w/o Ext Tx Clk (TT)—Autobaud rate with external clock.
DTE, All Clocked by Ext Clk (ST/RT)—The DCE equipment provides all clocks. The
ST input clock is used to clock out the external transmit clock (TT) and the send
data (SD). The RT input clock is used to clock in the receive data (RD).
TDM/TDC Interleaved Slow Port—Available only on even-numbered bundles. Use
this option for the slower port of the time domain correlation (TDC) circuit.
DTE, All Clocked by User Clk(RT)—The DCE equipment provides all clocks. The RT
input clock is used to clock out the external transmit clock (TT) and the send data
(SD) and to clock in the receive data (RD).
Custom—The custom clocking configuration is used.
Chapter 2: Configuring CTP Bundles
Table 49 on page
107.
107
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