3Com S330 manual Configuring the Serial Port

108CHAPTER 4: CONFIGURING PATHBUILDER S330/S310 MODULES, PORTS, AND APPLICATIONS

Figure 78 Configuring the Serial Port

5Change the following parameters, as desired:

Link Type—The input/output protocol for encapsulation and SAR to AAL5 conversion.

DXI —ATM Forum Mode 1A

SDLC—ITU standard HDLC/SDLC frame

Frame Relay—Frame Relay Forum Specification 5 and 8; modes 1 and 2

Terminal Timing Source—This parameter applies only when the attached cable is DCE type cable. The setting for the Terminal Timing depends on the nature and speed of the device application, but the typical configuration is Internal—the PathBuilder S330/S310 provides the clock for the device application. In any case, the Terminal Timing Source setting for the PathBuilder S330/S310 serial port must be the opposite of that for the device. For example, if the Terminal Timing Source for the router is set to Internal, then you must set the Terminal Timing Source for the serial port to External.

Internal—Configures the port to use the internal clock as the terminal timing source. The PathBuilder S330/S310 provides the clock to clock in the data traffic from a router or other data device.

External—Configures the port to use an external device as the terminal timing source. The PathBuilder S330/S310 accepts the clock for data from the router or other data device.

Receive Timing Phase—Receive timing phase control. This parameter applies only when the attached cable is DCE type cable. Depending on the speed of the device application and the clock phases, particularly those of the return clock, you may have to set Receive Timing Phase to Inverted (invert the clock) to ensure correct clock and data phase. This option is used most often to correct for cable length delays when Terminal Timing is set to Internal.

Normal—The receive timing from the remote endpoint (node) is normal clocking.

Inverted—The receive timing from the remote endpoint (node) is inverted clocking.