E3Switch DS3 Operating Information Manual
Also see for DS3: Operating information
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Chapter 5: Operating Modes and ConfigurationChapter 6: InteroperabilityLANThe LAN ports of the gateway support, at a minimum, all 100BaseTX Full-Duplex Ethernet connections upto maximum line lengths and are set to auto-MDI/MDIX to automatically detect/correct crossover vsstraight LAN cable and autonegotiate for full-duplex and pause frame modes with the attached LANequipment. Passwords may be purchased to upgrade to enhanced LAN port modes as described elsewherein this manual.The gateway will pass all unerrored packets which do not exceed 1650 bytes in packet length (9600 withjumbo frames enabled). This length allows QinQ, stacked VLAN, and extended packet-length routerprotocols to be passed without concern. The management agent accepts and responds with packets havingMTU of 1350 bytes in order to automatically allow room for security protocol overheads.Autonegotiation problemsThere are rare cases with older LAN equipment in which it may be necessary to disable autonegotiation. IfCRC-errors or short packet errors are seen in the management statistics of the LAN port, the attached LANequipment has probably configured itself to half-duplex mode and colliding packets are being lost. In sucha case, autonegotiation should be disabled on both the gateway and the attached LAN equipment with bothforced to 100BaseTX full-duplex. Autonegotiation interoperability and standards were not well understoodby the industry at the inception of 100BaseTX, resulting in some older LAN equipment not understandingthe gateway's autonegotiation advertisement of strictly full-duplex capability.It is highly desirable to leave autonegotiation enabled so that changing attached LAN equipment does notresult in the new equipment defaulting to half-duplex if set to autonegotiate.SFP LAN Port 1This port is designed to be compatible with inexpensive, high-quality, copper or fiber-optic, SFPtransceivers from Finisar, which allows LAN connections of 10km or more. Most other industry-standardSFP transceivers will work as well; however, fiber-optic features such as temperature and opticaltransmit/receive power and alarms will only be available if using Finisar transceivers. Non-Finisar copper,RJ45 SFP transceivers may only operate in 1000Base-T mode, while recommended transceivers fromFinisar, and possibly Avago or 3Com will operate in 100Base-TX mode as well.Pause FramesThe gateway generates no pause frames and ignores pause command frames sent to it.TelecomThe gateway can transmit over a variety of E3 or T3/DS3 links (with appropriate media gateways) such asfiber optic, microwave radio, laser, copper, satellite, or a combination; however, the attachment interface isalways via 75-ohm copper coaxial rather than optical. The TDM circuit may be either framed or unframedand supports both M13, M23, clear-channel, C-Bit, and G.751 framing. C-Bit framing is suggested for DS3links.Fiber/Copper Media GatewaysTransition Networks DS3/E3 Coax to Fiber Media Gateway, SCSCF3014-100 has been reported to lack theability to properly maintain separate DS3/E3 transmit clock speeds in each direction and are notrecommended. This problem typically manifests itself as frame slips or loss of TDM signal lock in one15 |
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