Port descriptor text

Specifies a description for the port.

Enter a description of up to 62 alphanumeric characters. Do not use the following characters:

( ; ' " ) ]

Interface

Displays the menu used to configure the interface type, mode, and encoding.

Select 2) Interface.

Type

Specifies the electrical standard used on the serial interface.

Select one:

• OFF—Do not set the interface type to OFF.
• EIA-530
• EIA-530A
• RS-232
• V.35

Mode

Specifies that the interface is connected to a data communication equipment (DCE) device or to a data terminal equipment (DTE) device.

Select one:

• DCE—The interface is connected to a DCE device.
• DTE—The interface is connected to a DTE device.

Encoding

Specifies the serial encoding method used on this bundle.

Select one:

• NRZ—nonreturn to zero (NRZ) line encoding.
• ISOCH—isochronous encoding. Isochronous encoding does not provide or embed the clock in the data.
• CDI—conditioned diphase. Conditioned diphase encoding recovers and embeds the clock in the data signal.
• MSTAR—MilStar encoding.
• TRANS—Transparent encoding. Transparent encoding is for unique and nonstandard applications. Verify with JTAC that the application requires this encoding scheme. You may need special adapters on the cable to properly map the data and clock signals to the connector pins used by the application.
• TDM—Additional data is interleaved with the port’s serial data. This option is used on TDM/TDC high-speed ports and is available only on even numbered ports on a CTP 2000 serial module.

Enter Synthesized port rate (KHz)

Specifies the speed of the port. In networks without bandwidth constraints, we recommend a multiple of 10.

The port speed recommendations vary according to encoding type:

• For transparent mode circuits, the port speed is the sample rate for user data. Therefore, the port rate should be a multiple of the user data rate.
• For CDI or ISOCH circuits, the port speed is limited to 1024 Kbps.

The port speed also varies depending on hardware:

• The CTP1002 device is limited to a port speed of 2048.000000 KHz.
• The CTP1012 device cannot have an aggregate port rate (sum of the rates of all ports) greater than 49.152 Mbps.
• The CTP2008, CTP2024, and CTP2056 devices cannot have an aggregate port rate greater than 114.688 Mbps.

Enter a number from 0.00100 through 12288.00000 KHz.

Enable adaptive clocking?

Specifies whether adaptive clocking is enabled for this circuit.

If both end nodes are not locked to a clock reference, we recommend that you enable one end (not both) for adaptive clocking

Appears only if you select ISOCH, CDI, MSTAR, TRANS, or TDM encoding.

Specify y (yes) or n (no).

Initialize adaptive clocking parameters? y[n]: y

If you enabled adaptive clocking, specifies whether or not to initialize adaptive clocking parameters to their default values, which depend on port speed, packet size, and buffering parameters set on the bundle.

We recommend the following settings:

• If you are configuring the bundle for adaptive clocking for the first time, enter y.
• If you have previously configured the bundle to optimize adaptive clocking for this network, enter n.

Specify y (yes) or n (no).

Enable 16 bit FIFO?

Enables a 16 bit jitter absorption FIFO at this end of the transparent circuit.

Appears only if you select TRANS encoding.

Specify y (yes) or n (no).

Invert FIFO Write clock?

Appears only if you select TRANS encoding.

Specify y (yes) or n (no).

Invert FIFO Read clock?

Appears only if you selected TRANS encoding.

Specify y (yes) or n (no).

Use ST lead (instead of RTS/CTS)?

Transparent encoding samples and forwards local SD/TT/RTS/DTR to the remote RD/RT/CTS/DSR respectively in both directions.

SD and TT are sampled at the configured port rate with no jitter, while RTS and DTR are subject to additional delay and jitter (because they are signaling leads).

You can specify that the circuit uses the ST lead instead of the RTS and CTS leads, which will not have this delay and jitter.

Appears only if you selected TRANS encoding.

Specify y (yes) or n (no).

Is ST an input?

Appears only if you selected TRANS encoding.

Specify y (yes) or n (no).

TDC Clk/Data on port N+1

This option is used for TDM/TDC operation. See Configuring the High-Speed CTP Bundle for TDM/TDC Operation (CTP Menu).

TDM rates

This option is used for TDM/TDC operation. See Configuring the High-Speed CTP Bundle for TDM/TDC Operation (CTP Menu).