E3Switch DS3 Operating Information Manual
Also see for DS3: Operating information
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Chapter 5: Operating Modes and ConfigurationPacket FlowPort to Port Packet FlowLAN-to-LANCertain firmware versions allow LAN-to-LAN packet flow to be enabled, if desired, in units where thesecond SFP/LAN port has been enabled/purchased. LAN-to-LAN unidirectional flow for monitoring mayalso be configured if desired.LAN-to-LAN flow can result in dropped packets if the destination LAN port bandwidth setting is too low.An example would be 2x 44Mbit/s traffic from a dual-DS3 and > 12Mbit/s traffic from the other LAN portexceeding 100Mbit/s of a 100Base-TX LAN port which was receiving both DS3 and LAN-to-LAN traffic.The unit will attempt to preserve incoming DS3/E3 packets while dropping LAN-to-LAN packets in suchan instance.LAN-to-LAN should be used cautiously in combination with management or data-only LAN port settings.The blocking of a subset of traffic can result in network and spanning tree topologies which can beinappropriate or difficult to diagnose.ForwardingOnce a PPPoE session is established, all PPPoE packets are passed from LAN to WAN unfiltered andunmodified. All PPP packets from the WAN are passed to the LAN likewise.LoopbackCertain firmware versions allow packet flow from DS3 ports to LAN to be configured to automatically haltin certain situations in which the converter is receiving loopback data. The automatic loopback trafficdisable will only occur if the local converter has requested the remote to loopback. This occurs when anSNMP request sets the local converter dsx3SendCode variable to dsx3SendLineCode, which requests theremote converter to loopback DS3 data received. DS3 loopback initiated by the carrier or any sourceother than described above cannot be recognized as loopback data and the setting described will beirrelevant.LAN Port SettingsThe following hardware for the two LAN ports exist on all converters shipped:● GbE, GigE 1000Base-T for the RJ-45 LAN port2.● Jumbo frames (9600 bytes).● SFP LAN Port 1 which can accept optical or copper (100/1000) SFP transceivers.● Either LAN port can be configured as a dedicated out-of-band management port if desired.See the “Interoperability” section of this manual for information on packet lengths and detailed portconnection/autonegotiation discussion.The autonegotiation mode of the converter must match the autonegotiation mode of attached LANequipment. If autonegotiation is enabled on the converter it must be enabled on the attached equipment. Ifdisabled on the converter, it must be disabled on the attached equipment. This requirement is necessary tofulfill 802.3 standards which mandate a fallback to half-duplex operation if an autonegotiation mismatchexists. The converters require full duplex to operate.LAN Port SpeedTypically, set the PPPoE LAN port speed to GigE 1000Mbit/s to allow packet-lengths greater than 1500-bytes and up to 9600 bytes. Set the management LAN port speed to 100BASE-TX to avoid DMAunderflow/overflow errors of the converter.13 |
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