Paradyne 392xPLUS operation manual DTE Interface Configuration Options Ð Multiport Mode l

DCP Configuration

Table 4-1

(2 of 9)

DTE Interface Configuration Options Ð Multiport Mode l

Bakup_TXClk_Src: Internal

Nxt Internal RXC_Loop Port1 Port2 Port3 Port4

This configuration option only appears when Dual_Leased_Ln is configured for Enable.

Backup Transmit Clock Source. Selects the clock reference source when operating in the Dual Leased Line Mode. This is a special mode in which one leased line is used to back up another.

NOTE: If the DTE Bridge is enabled, Ports 2, 3, and 4 are not available.

Internal ± The transmit data's clock source is derived from the modem's internal clock. This clock is available as an output on Pin 15 (TXC) of the EIA-232-D interface.

Receive Clock Loop ± The modem's transmit clock is derived from its received analog signal. The derived clock is available as an output on Pin 15 (TXC) of the EIA-232-D interface.

Port1 ± The transmit data's clock source is provided on Pin 24 (XTXC) of the EIA-232-D interface for Port 1.

Port2 ± The transmit data's clock source is provided on Pin 24 (XTXC) of the EIA-232-D interface for Port 2.

Port3 ± The transmit data's clock source is provided on Pin 24 (XTXC) of the EIA-232-D interface for Port 3.

Port4 ± The transmit data's clock source is provided on Pin 24 (XTXC) of the EIA-232-D interface for Port 4.

CT111_Rate Cntl: Disable

End Disable Fallback1 Fallback2

This configuration option does not appear when V.34 is enabled for a leased or dial line.

CT111 Rate Control. Allows the DTEs to control modem rate via Pin 23 of the EIA-232-D interface. This configuration option determines the effect of the DTE Rate control signals. CT111 is also known as CH on the EIA-232-D interface.

Disable ± Disregards all CT111 Rate Control.

Fallback1 ± Forces the modem to decrease its configured data rate to the next lower data rate when any of the CT111 signals are OFF. When all of the CT111 signals are ON, the modem returns to its previous data rate.

Fallback2 ± Forces the modem to decrease two data rates (while remaining in the same modulation scheme) when any of the CT111 signals are OFF. When all of the CT111 signals are ON, the modem returns to its previous data rate. Note, Fallback2 is not available for TMp tributaries.

NOTE: For proper CT111 operation, disable the Autorate configuration option.

MSD Port Control: Host

Nxt Host Modem

This configuration option does not appear when MSD is disabled.

Modem Sharing Device Port Control.

Host ± The host computer determines the polling sequence that controls which port transmits at any given time. When the DTE/DCE equipment attached to a port raises RTS (Request-to-Send) it gets to use the channel. If more than one port raises RTS at the same time, the transmission on the channel is garbled. The system protocol ensures that only one port transmits data at a time.

Modem ± The modem determines the polling sequence that controls which port transmits at a given time. The first port to raise RTS will receive CTS (Clear-to-Send) authorization to transmit data. When the current transmitting port lowers its RTS, the modem randomly polls another port with RTS raised.

3920-A2-GN31-30 November 1996 4-11