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# Selecting the Type of Clocking on Serial Ports for CTP Bundles (CTPView)

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.

Before you begin:

- Log in to the CTPView software at least at the Net_Admin level.
- Connect the CTPView server to the CTP device for which you want to configure bundles.
- Disable the bundle before you modify the bundle options.

To specify the clocking type for CTP bundles using CTPView:

1. In the side pane, select Bundle > Configuration.
2. Run your mouse over the Display and Select an Existing Bundle bar.
3. In the table of bundles, select the bundle that you want to modify.
4. Under Port Options, select a clocking type in the Clock Cfg field. Table 1 describes the clocking types that are supported for each encoding type.

5. Click Click to Submit Bundle AND Port Changes.

Table 1: Clocking Type Supported for Each Encoding Type as Displayed in CTPView

Encoding Type | Clocking Type Supported
--- | ---
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: Cfg Rate - Int Clk—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. Cfg Rate - Ext Clk—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. Assumes that the attached device is using ST or clock reference traceable to CTP reference. Typically used for higher data rates (>1 Mbps) and long cable. All Clock - Ext Clk—All clocked with external TX clock (TT). The CTP clock 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. Adap Rate - Ext Clk—Adaptive clocking with external TX clock (TT). Adap Rate - Int Clk—Adaptive clocking with internal clock. Auto Rate - Int Clk—Autobaud rate with internal clock. Auto Rate - Ext Clk—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 domain correlation (TDC) circuit. Custom—The custom clocking configuration is used.
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: Custom—The custom clocking configuration is used. 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).
ISOCH | You can specify the following clocking methods for ISOCH circuits: ISOCH - Master End—This end of the circuit generates a clock signal and sends it to the remote end. Configure ISOCH - Slave End at the remote end. ISOCH - Slave 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. If you specify slave end, the adaptive clocking configuration appears. Custom—The custom clocking configuration is used.
CDI | You can specify the following clocking methods for CDI circuits: CDI - Master End—This end of the circuit generates a clock signal and sends it to the remote end. Configure CDI - Slave End at the remote end. CDI - Slave 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. If you specify slave end, the adaptive clocking configuration appears. Custom—The custom clocking configuration is used.
MSTAR | You can specify the following clocking methods for MSTAR circuits: MSTAR - Master End—This end of the circuit generates a clock signal and sends it to the remote end. Configure MSTAR - Slave End at the remote end. MSTAR - Slave 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. If you specify slave end, the adaptive clocking configuration appears. Custom—The custom clocking configuration is used.
TRANS | You can specify the following clocking methods for TRANS circuits: TRANS - Master End—This end of the circuit generates a clock signal and sends it to the remote end. Configure TRANS - Slave End at the remote end. TRANS - Slave 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. If you specify slave end, the adaptive clocking configuration appears. Custom—The custom clocking configuration is used.

#### Published: 2011-01-09

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