Netopia R5000 manual Line configuration for a Serial line

8-2 User’s Reference Guide

Line configuration for a Serial line

The Serial Line Configuration screen is where you enter the configuration parameters for your leased line, in order for the Netopia Router to communicate with the physical connection.

Serial Line Configuration

Circuit Type...	Permanent Sync
Data Rate (kbps)...	Auto
Invert Tx Clock:	No
Circuit Activation Requires...	DCD and DSR
Data Link Encapsulation...	Frame Relay

Enter Information supplied to you by your telephone company.

1.Select Circuit Type and press Return. From the pop-up menu, select your circuit type: Permanent Sync (the default) or Switched Async.

2.Select Data Rate (kbps) and press Return. From the pop-up menu, select a fixed data rate for your digital line or select Auto. (The data rates to choose from range from 56 kbps to the highest synchronized line speed.) The Auto setting allows your Netopia Router to determine the data rate of your serial line at the time of circuit activation. For an asynchronous modem, the only encapsulation is PPP. Press Return.

3.Select Invert Tx Clock and toggle to Yes or No depending on whether you use this selection. Press Return.

Invert Tx Clock causes transmitted data to be delayed by half a clock phase. This option is useful for X.21 DTEs (Data Terminal Equipment) because their transmit data can become altered in relation to the clock sourced by the DCE (Data Communications Equipment).

DTE (Data Terminal Equipment) is a term used to define the equipment rate. It is a designation for the maximum rate at which a router can exchange information.

DCE (Data Communications Equipment) is a term defined by both Frame Relay and X.25 committees that applies to switching equipment and is distinguished from the devices that attach to the network (DTE).

4.Select Circuit Activation Requires and from the pop-up menu select DCD-only, DSR-only, or DCD and DSR (the default). Press Return.

Some V.35 interfaces represent their capability to transfer user data end-to-end with the DCD signal, while others offer a more accurate representation with DSR. For this latter case, you can choose to ignore DCD and instead sense DSR as the line status indicator.

Note: This option will be hidden if an X.21 cable is attached.