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Model TC3720  .Redundant Industrial Ethernet Fiber Optic Switch            6Tx + 2Fx Ports, 2-fiber strands       Features  Product or Application Questions (click here) Ring Self-Heals within 50ms Web-Based/Serial Configuration IEEE 802.3, 802.3u, 802.3x Compliant 6 Ethernet 10/100-Base Auto-Sensing UTP Ports 2 Fiber Optic 100Base-FX Ports Standard Single Mode Distance of 50km (optional 100km) Multimode or Single Mode (1300/1550nm) Full or Half-Duplex Operation Industrial Hardened (optional) Optional 2 x V.90 Modem for IP Routing 12VDC, Optional 24VDC, -48VDC, 125VDC or 115/230VAC Description Intended for Multidrop Self-Healing Ring topologies, the TC3720 Ethernet Fiber Optic Switch interconnects up to six 10/100M devices at each drop. The ring can consist of either multimode or single mode fibers or CAT5 UTP cables. Fault recovery time is less than 250 milliseconds. The TC3720 offers a sophisticated Self-Healing Ring scheme. Fault conditions are detected on both Tx and Rx, upstream and downstream of each unit, and automatically re-routed to maintain Ring integrity. If both upstream and downstream fiber breaks, the Point-to-Point Protocol (PPP) can be used over the TC3720 optional internal V.90 modems to provide IP connectivity to a Server/Router through Public Switched Telephone Network. A Web-based configuration user interface is provided to view and change network settings such as IP Address, Subnet, Gateway, Speed, Half/Full Duplex, Name, Password and other parameters. It also monitors the fiber ring status, alarm conditions, fault locations for local and remote units. The TC3720 can also be configured through a serial console (Out-of-Band). The TC3720’s store-forward switching technology eliminates the congestion problem inherent to the contention-oriented Ethernet CSMA/CD protocol. This improves predictable response times under heavy network loads. The TC3720 offers two multimode (1300nm) or single mode (1300/1550nm) ports and six independent Ethernet 10/100-Base Auto-Sensing switched ports. There are two optional versions (Model TC3720T) for extreme temperature applications  (-20° to 70°C, -40° to 80°C). Power is 12VDC, optional 24Vdc, -48Vdc, 125Vdc or 115/230VAC. Power redundancy is standard on 12Vdc. The unit is 19" rack mountable. Optical connectors can be ST, FC or SC. TC3720 Specifications Data Rates 10/100 Mbps (Auto-Sensing) 56K, V.90 Modem Optical Interface 2 Ethernet 100Base-Fx Transmitter ELED, LASER Receiver PIN Diode Wavelength 1300nm Multimode 1310nm, 1550nm Single Mode Fiber Optic Connectors ST, optional FC or SC Loss Budget* (1300nm, 1550nm) Multimode (62.5/125µm): 15dB Single Mode (9/125µm): 20dB Laser Single Mode: 25dB Electrical Ethernet Ports 6 RJ-45 Female Interface Ethernet 10/100Base-T Standard IEEE 802.3/3u/3x System Bit Error Rate 1 in 10^9 or better Fault Recovery < 50 msec. V.90 Modem (Optional) Connector RJ11 Female Interface V.90/V.92 Ports 2 Visual Indicators System Status Power, Status (8)  Port Status (Each Port) 10/100, Act, Link, Tx, Rx, Speed Alarm  Dry Contact Normal OPEN Power Standard 12VDC @ 500mA Optional 24VDC, -48VDC, 125VDC or 115/230VAC (with external power cube) Temperature Operating -10° to 50°C High Temp (Optional) -20° to 70°C Hardened (Optional) -40° to 80°C Storage -40° to 90°C Humidity 95% non-condensing Physical (Standalone/Wall Mount Unit) Height (3.53 cm) 1.4" Width (18.14 cm) 7.1" Depth (16.57 cm) 6.5" Weight (544 gm) 1.2 lbs Typical Application (Application Questions) The TC3720 is frequently used to interconnect Remote Terminal Units (RTUs) or Programmable Logic Controllers (PLCs) in Utility substation SCADA Networks that require multiple channels and the reliability of a Self-healing Ring Topology. It is also used for similar connectivity applications in Traffic Control, Industrial Process Control and Security System Networks.