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8-2 User’s Reference Guide
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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.
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.
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.