Configuring Ethernet and serial ports 121SmartWare Software Configuration Guide 10 • IP context overviewSerial interface related informationThe SmartNode 2300 supports the V.35 and X.21 standard for synchronous serial interfaces with speeds up to2 Mbps. Devices that communicate over a serial interface are divided into two classes:• Data terminal equipment (DTE)—The device at the user end of the user-to-network interface. The DTEconnects to a data network via data DCE, and typically uses clocking signals generated by the DCE.• Data communications equipment (DCE)—The device at the network end of the user-to-network interface.The DCE provides a physical connection to the network, forwards traffic, and provides a clocking signalused to synchronize data transmission between DCE and DTE devices.The most important difference between these types of devices is that the DCE device supplies the clock signalthat paces the communications on the interface.Note The SmartNode 2300 is working as a DTE by default.Before you connect a device to the synchronous serial port, labeled SERIAL 0/0 on SmartNode 2300, youneed to check the following:• Confirm that the device to which you are connecting to is a DCE providing a clock signal on the synchro-nous serial interface.• Type of connector, male or female, required to connect at the device• Signaling protocol required by the device must be X.21 or V.35QoS related informationCheck with your access service provider if there are any QoS related requirements, which you need to knowprior to configuring SmartWare QoS management. Check the following with your access service provider:• What is the dedicated bandwidth, which you have agreed with your access service provider?• How does your provider perform packet classification, e.g. which ToS bits have to be used to define the sup-ported classes of service?Configuring Ethernet and serial portsIn SmartWare, Ethernet and serial ports represent the physical connectors on the SmartNode hardware. Sinceports are closely-knit with the physical structure of a SmartNode, they cannot be created but have to be config-ured. The configuration of a port includes parameters for the physical and data link layer such as framing andencapsulation formats or media access control. Before any higher-layer user data can flow through a physical port,you must associate that port with an interface within the IP context. This association is referred to as a binding.For information and examples on how to configure an Ethernet port, refer to chapter 13, “Ethernet port con-figuration” on page 141 or for a serial port to chapter 15, “Serial port configuration” on page 169.Creating and configuring IP interfacesSmartWare supports one instance of the IP context, named router. The number and names of IP interfacesdepend upon your application scenario. In SmartWare, an interface is a logical construct that provides higher-layer protocol and service information, such as layer 3 addressing. Hence interfaces are configured as part of theIP context and represent logical entities that are only usable if a physical port is bound to them.
