Selecting the Type of Clocking on Serial Ports for CTP Bundles
(CTP Menu)
This topic describes how to select the type of clocking
that you want to use on serial ports. The type of clocking supported
depends on the type of encoding you are using.
CTP Menu gives you the option of selecting the clocking
type when you change the interface encoding for a circuit. You can
also specify the clocking type for CTP bundles using the CTP Menu
as follows:
- From the CTP Main Menu, select 1) Bundle
Operations.
- Select 1) CTP.
- Select a bundle from the list.
If you select an active bundle, you are prompted to disable
the bundle before configuring it.
- Select 3) Port Config.
- Select 3) Clock Config.
- Select 1) Port Clock Config.
- Configure the options as described in Table 47.
Encoding Type | Clocking Type Supported |
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NRZ and TDM with interface mode set to DCE | 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.
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NRZ and TDM with interface mode set to DTE | 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.
|
ISOCH | You can specify the following clocking methods for ISOCH
circuits: 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. ISOCH - Master End—This end of the circuit generates
a clock signal and sends it to the remote end. Configure ISOCH
- Adaptive End at the remote end. ISOCH - Adaptive End—This end of the circuit uses
adaptive clocking to receive the clock signal from the remote end.
The clock slave uses its period to determine when to sample data and
how to transmit data across the link. Custom—The custom clocking configuration is used.
|
CDI | You can specify the following clocking methods for CDI
circuits: 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. CDI - Master End—This end of the circuit generates
a clock signal and sends it to the remote end. Configure CDI -
Adaptive End at the remote end. CDI - Adaptive End—This end of the circuit uses
adaptive clocking to receive the clock signal from the remote end.
The clock slave uses its period to determine when to sample data and
how to transmit data across the link. Custom—The custom clocking configuration is used.
|
TRANS | You can specify the following clocking methods for TRANS
circuits: 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. TRANS - Master End—This end of the circuit generates
a clock signal and sends it to the remote end. Configure TRANS
- Adaptive End at the remote end. TRANS - Adaptive End—This end of the circuit uses
adaptive clocking to receive the clock signal from the remote end.
The clock slave uses its period to determine when to sample data and
how to transmit data across the link. Custom—The custom clocking configuration is used.
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