S-Access SA-REP-ETHERLINK_II-1DA-PL Manual
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ETHERLINK II - Repeater ManualPage 34 of 106A group of LAN Ports (Ethernet interface) means that a connector (or connectors) is located onthe front panel of the device. This port can serve both as a Trunk port and an Access port.The Trunk port is a port at the input and output of which all present packets have the VLANformat, namely, the Ethernet frame with a header, determining the number of the VLAN andQoS (Quality of Service) to which the IP packet belongs. Special equipment, which supports theVLAN, is connected to the Trunk port. A PC with a standard network interface card cannot beconnected to the Trunk port.The Access port is a port at the input and output of which all present packets have a standardEthernet format (without the additional two bytes for the header). A PC with a standard networkinterface card can be connected to the Access port.Ethernet packets of the VLAN format are always transmitted over the xDSL or E1 interfaces inS-Access Etherlink_II devices. In this case, the data of Assess ports are first transformed intoEthernet packets of the VLAN format according to the specified rules and then are transmittedover the line interface.A VLAN number and a QoS priority level, which are used by default to convert Ethernet packetsinto the VLAN format, are assigned to the Access port. In addition, every unit contains a tableof static MAC addresses of devices, so that each device can have a VLAN number and a QoSpriority level (a table of special MAC addresses). This table can contain up to 8 MAC addresses.If a packet is received from the Access port, and the MAC address of the packet sender is inthis table, a header with the necessary VLAN number and the QoS priority will be assigned tothis packet before transmitting it to the Trunk port. Otherwise, a default VLAN number and QoSpriority will be assigned to the packet.Physical ports (if there are some of them) are united into a LAN group in the device software. Allphysical Ethernet interfaces (the LAN group) have identical VLAN and QoS settings. Apossibility is also provisioned to configure separately the transmission rate and duplex for eachphysical interface (ETH1 – ETH4).A group of DSL ports (WAN1 – WAN4) (xDSL interface) means that Ethernet data can bemapped onto the specified time slots of the xDSL interface by using the switch of 64 kbit/s timeslots. In this case, this port always serves as a Trunk port, i.e., data received from Accessports are first transformed into Ethernet packets of the VLAN format according to the rulesspecified and then are transmitted over the xDSL interface.A group of E1 ports (WAN1 – WAN4) (E1 interface) means that that Ethernet data can bemapped onto the specified time slots of the E1 interface by using the switch of 64-kbit/s timeslots. In this case, this port always serves as a Trunk port.A virtual management port (INT) (Virtual management port) is an internal device managementprogram. IP-address of this device is the logical address of the management program. Forexample, to open a session for managing a remote device (i.e., to exchange data between acontrol and management PC and the device program), the IP-address of this device should bespecified in the Telnet program. At the physical layer, the MAC address of the device is also themanagement program address, which is contained in the Ethernet frame.Note: As a rule the data of the management port have the highest priority (for example, QoS =7).3.6.3 An integrated switch of 64-kbit/s time slots3.6.3.1 E1 mode (transmission of only time slots of E1 streams)In this mode, only time slots of E1 streams are transmitted over xDSL lines.Time slots of the E1 stream are transmitted in the xDSL frame according to ITU-T Rec. G.991.2. |
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