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11INDEPENDENT SHIELD TERMINALThe model MD7ST, designed specifically for 4-20 mA loop, is provided with fuses to disconnect a failed device from the power bus supplying multiple devices. When the device protected by the MD7ST fails in shortcircuit mode, the fuse separates it from the power bus and protects the entire system.LOOP DISCONNECT FUSEFloating and grounding modes are selectable in free combination between shield and signal, shield and ground.In the floating mode, the shield is normally insulated from the signal and the ground by a dis-charge element. When an elevated potential is detected by a lightning surge, the discharge el-ement is immediately activated to prevent discharge at an undesirable location.In the grounding mode, the shield is normally connected via the signal line with a low potential difference of several to several tens of volts, and connected permanently to the ground.Each installation or network protocol requires different earth grounding method, such like both-end grounding, single-end grounding, SG terminal connection. The MD7 Series provide the most suitable grounding type for each application. 8-Port Ethernet Switch with Surge ProtectorNEWMD7 Series function digram and wiring example.LAN PORT SPECIFICATIONS• Optional surge protector function for each port • Protects Ethernet devices from surges entering through LAN cables• Surge protector life monitor function with LED and contact output alarm• Data transfer rate can be fixedStandardsNumber of portsData transfer rateCableMaximum segment lengthSwitchingFlow controlBufferMAC address tableIEEE 802.3, IEEE 802.3u, IEEE 802.3x8; All ports support AUTO-MDIX*10 Mbps (10 BASE-T), 100 Mbps (100 BASE-TX); Supports Auto-Negotiation10 BASE-T (STP cable, category 5)100 BASE-TX (STP cable, category 5e)100 metersStore & ForwardPAUSE FramesBack pressure64 KB1024Full duplexHalf duplexSURGE PROTECTOR PERFORMANCECompliant standard Between ports Port to G FG (shield) to GVoltage protection level Port to FG or G Between each port FG to GEN61000-4-5 level X1kV (combination waveform)**10kV (combination waveform)20kV (combination waveform)***160V min.160V min.160V min. (with the shortcircuit bar removed)** RJ-45 connector contact is out of the scope of this protection. Using twisted-pair (STP) LAN cable is effective to reduce risk of fusing contact.*** With the shortcircuit bar* Automatically sensing cable type (straight-through or cross-over).LAN Ports (x 8)RJ45 Connector100M LED*1. Provided only with the surge protector option.LINK LEDProtector * 1Surge Protector Life Monitor LEDStatusDevice status LEDFRONT VIEW

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