Hssi To Ethernet Adapter

serial cable | Network Cable Tester

All long-haul communications and most computer networks use serial connections, because the cost of cable and synchronization difficulties make parallel connections impractical. The most significant vantage is simpler wiring. Also, serial cables can be longer than parallel cables, because there is much less interaction (crosstalk) among the conductors in the cable. In this chapter, we will confine our consideration of serial communications to those connecting LANs to WANs.

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Serial Communication StandardsSerial Communication Standards

The figure is a simple representation of a serial communication. Data is encapsulated by the communications protocol used by the sending router. The encapsulated frame is sent on a physical medium to the WAN. There ar various ways to traverse the WAN, but the receiving router uses the same communications protocol to de-encapsulate the frame when it arrives.

There are many different serial communicating standards, each one using a dissimilar signal method. There ar three key serial communicating standards affecting LAN-to-WAN connections: RS-232 – Most serial ports on personal computers adjust to the RS-232C or newer RS-422 and RS-423 standards. Both 9-pin and 25-pin connectors are used. A serial port is a general-purpose port that can be used for almost any type of device, including modems, mice, and printers. Many network devices use RJ-45 connectors that also adapt to the RS-232 standard. The figure shows an example of an RS-232 connector. V.35 – Typically used for modem-to-multiplexer communication, this ITU standard for high-speed, synchronous information exchange combines the bandwidth of several telephone circuits. In the U.S., V.35 is the port standard used by most routers and DSUs that connect to T1 carriers. V.35 cables ar high-speed serial assemblies designed to support higher information rates and connectivity betwixt DTEs and DCEs over digital lines. There is more on DTEs and DCEs later in this section. HSSI – A High-Speed Serial Interface (HSSI) supports transmission rates up to 52 Mb/s. Engineers use HSSI to connect routers on LANs with WANs over high-speed lines such as T3 lines. Engineers also use HSSI to provide high-speed connectivity betwixt LANs, using Token Ring or Ethernet. HSSI is a DTE/DCE interface developed by Cisco Systems and T3plus Networking to address the need for high-speed communicating over WAN links.

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