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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: MicroTurbine Communications Null Modem (or Modem Eliminator) Cable A null modem cable is used for connecting two computers together without a modem. It is a RS-232 cable that interchanges conductors 2 and 3. It is also known as a modem eliminator. Wiring connections for null modem cables with DB9 connector (see Figure 3) and DB25 connector (see Figure 4) are as follows: TXD 3 RXD 2 RTS 7 CTS 8 DSR 6 DCD 1 DTR 4 3 TXD 2 RXD 7 RTS 8 CTS 6 DSR 1 DCD 4 DTR TXD 2 RXD 3 RTS 4 CTS 5 DSR 6 DCD 8 DTR 20 2 TXD 3 RXD 4 RTS 5 CTS 6 DSR 8 DCD 20 DTR SG 5 5 RI 9 9 SG SG7 7SG RI RI22 22 RI Figure 3. DB9 Null Modem Cable Figure 4. DB25 Null Modem Cable Ethernet I/O Connections The Ethernet connectors are identified as J1 and J3 on the C30 UCB (see Figure 1), and as J1 and J2 on the C60 UCB (see Figure 2). These connectors are used for MultiPac communications. Refer to MultiPac Operation Technical Reference (410032) and Capstone PowerServer Technical Reference (410024) for Ethernet connection details. Cable Type The cable type required for Ethernet connection is RG-58A/U (coaxial, 50-Ohm impedance). Recommended cable type is Belden, Part Number 9907 or equivalent. Ethernet Requirements The Ethernet adheres to the requirements set forth in IEEE 802.3 Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Access Method and Physical Layer Specifications. The basic requirements include the following: Maximum Segment Length The maximum segment length of a thin wire 10B2 cable is 185 meters or 607 feet. The designation “10BASE-2” stands for 10 Mbps/Baseband/200 meters. The 200m length is rounded up from 185m. For longer segments, a fiber optic repeater can be used. 410042-001 Rev A (February 2004) Page 8 of 10 This information is proprietary to Capstone Turbine Corporation. Neither this document nor the information contained herein shall be copied, disclosed to others, or used for any purposes other than the specific purpose for which this document was delivered. Capstone reserves the right to change or modify without notice, the design, the product specifications, and/or the contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction.PDF Image | Technical Reference MicroTurbine Communications
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