Black Box LE3700A-R2 manual Appendix B Cable Limits, Network/Cable Limits, Serial Cables

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ETHERNET PRINT SERVER

Appendix B: Cable Limits

B.1 Network/Cable Limits

Thinwire (10BASE2) segments can be no longer than 185 m (600 ft.), and can have taps no closer together than 0.5 m (1.5 ft.) apart. These can be no more than 30 taps per segment.

Thickwire segments can be no longer than 500 m (1650 ft.). Taps must be increments of 2.5 m (8 ft.) apart. There can be no more than 100 taps per segment.

10BASE-T segments can be no longer than 100 m (330 ft.). Longer segments may work in some instances, but we do not recommend them. Cable is phone grade (or better) unshielded twisted-pair (UTP) cable, RJ-45 connectors.

AUI cables can be no longer than 50 m (165 ft.).

For all media types, a total of 4 repeaters are allowed between any two nodes connected by 5 segments of cable. A maximum of 3 segments between any two nodes can have taps on them—the others must be point-to-point links (10BASE-T or fiber). For example, if you use 5 segments to go across 4 repeaters between 2 nodes, 2 of the segments (5-3=2) must have NO taps.

B.2 Serial Cables

The EPS complies to the RS-423 specification. If you connect the EPS to an RS-232 device, it is subject to the RS-232 limits shown below. If you connect the EPS to an RS-422 device, it is subject to the RS-422 limitations.

RS-232 lines are limited to 15 m (50 ft.) in length.

RS-422 lines are limited to 300 m (1000 ft.).

B.3 Parallel Cables

Parallel cables (Centronics or Dataproducts) can be no longer than 6.1 m (20 ft.).

All parallel cables must be internally twisted (each signal with its return signal) for the interfaces to function properly. If you don’t follow this rule, the EPS may lose data.

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Contents Ethernet Print Server FCC Statement Ethernet Print Server NOM Statement Trademarks Used in this Manual Contents Contents Specifications Description IntroductionAdditional Software You May Need Protocols SupportedPrinting from the host to the EPS EPS ConfigurationIntroduction EPS Network Installation InstallationInstallation Print Server Screen How Do I Know It’s Working? Power-Up TroubleshootingCode in Flash ROMs is Corrupt NetWare Host Configuration Host ConfigurationAvailable Topics Menu Supervisor Options Menu Available Options Print Queue Information Print Server Information Menu 10. Print Server Info/Status Screen TCP/IP Host ConfigurationTo the /etc/hosts file, Optional Rtel Functionality AppleTalk Host ConfigurationLAT Host Configuration Can also be set up as Troubleshooting the Printing Process Host Configuration Ethernet Print Server Protocol Overview TCP/IP NetWareAppleTalk LAT Protocol Overview Server Characteristics EPS ConfigurationEPS Configuration PasswordsService Settings Port CharacteristicsEPS Configuration NetWare Configuration TCP/IP ConfigurationAppleTalk Configuration LAT Configuration Ethernet Print Server Reverse Telnet Background UNIX/RTEL Host SetupEthernet Print Server Installing the Reverse Telnet Software Installation ProcedureReverse Telnet for Unsupported Unix Machines Setting up the Rtel Interfaces Creating Rtel Print Queues Queuename server Service Passwd options Deleting Rtel Print Queues Option Description Usage Creating Rtel Pseudo-DevicesQueueing with the Rtel Software Rtel Troubleshooting Connecting to a Specific Port Using Telnet RJ12 Or MMJ Appendix a RJ-45 Adapter PinoutAppendix a RJ-45 Adapter Pinout Network/Cable Limits Appendix B Cable LimitsSerial Cables Parallel CablesAppendix C Power-Up Tests Connections and TerminationLED Patterns LED State Meaning Appendix C Power-Up Tests Appendix D Network Logins Appendix D Network Logins Appendix E Quick-Start Guide Appendix E Quick-Start Guide Ethernet Print Server Page Copyright 2002. Black Box Corporation. All rights reserved

LE3700A-R2 specifications

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