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DCB SRX Multidrop Manual

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SRX Multidrop

TABLE OF CONTENTS

SECTION 1 - DESCRIPTION....................................................................... 2
SECTION 2 - SPECIFICATIONS ................................................................. 4
SECTION 3 - INSTALLATION..................................................................... 6
SECTION 5 - NETWORK MANAGEMENT PORT .................................... 13
SECTION 6 - INTERFACE SIGNALS AND CABLING.............................. 23
SECTION 7 - TROUBLESHOOTING......................................................... 29
SECTION 8 - WARRANTY......................................................................... 32
APPENDIX - MULTIDROP MAP WORKSHEET...................................... 33
Data Comm for Business, Inc.
PO Box 6329
Champaign, IL 61826-6329
August 8, 2002
(217) 897-6600
Firmware Version: 16.51 / 32.51
www.dcbnet.com
8500026

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  • Page 1: Table Of Contents

    SRX Multidrop TABLE OF CONTENTS SECTION 1 - DESCRIPTION............... 2 SECTION 2 - SPECIFICATIONS ..............4 SECTION 3 - INSTALLATION..............6 SECTION 4 - FRONT PANEL CONTROLS AND INDICATORS....9 SECTION 5 - NETWORK MANAGEMENT PORT ........13 SECTION 6 - INTERFACE SIGNALS AND CABLING......23 SECTION 7 - TROUBLESHOOTING............

  • Page 2: Section 1 - Description

    Multiple Host Configuration The SRX multidrop firmware also allows the host site to expand to more than a single SRX host. Multiple SRX hosts share the line using an MSU-4 modem sharing unit. A maximum of 64 ports is recommended to maintain satisfactory performance.
  • Page 3 The network and port configurations are stored in battery backed RAM to survive power failures. To reset all ports to the factory defaults and clear all local IDs and port mappings, press and hold the OK! switch while pressing RESET. OPTION SRX 8/16 MULTIPLEXER -->...

  • Page 4: Section 2 - Specifications

    SPECIFICATIONS Product 2.1.1 Data Ports Port Speeds Asynchronous only 300, 1200, 2400, 4800, 9600, 19,200 or 38,400 bps Data Format 10 bits/character, 1 start, 1 stop, 8 data (including parity) Interface RS-232D, implemented in RJ-45, 8 position connectors 2.1.2 Composite Port Speed Synchronous to 128 Kbps Asynchronous at 1200, 2400, 4800, 9600, 19,200 or 38,400 bps...
  • Page 5 Network Management Port Commands Show Configuration Show ID Show Map Show Drop Map Show Network Configuration Show Status Change Configuration Change ID Change Map Change Network Configuration Change Restart Timer Activity Counts Drop Activity Zero Activity Counts Flow Control Test Tools Capture Port Copy Command Show RS232...

  • Page 6: Section 3 - Installation

    POWER • Cables for connecting a modem or DSU/CSU and a Network Management terminal. • Manual DCB PRODUCT MANUAL SPL 2 TO 14 CHANNEL STATISTICAL MULTIPLEXER • Information regarding warranty, maintenance contracts and repair If a multiple host system was ordered, additional equipment is supplied.
  • Page 7 Location Place the multiplexer in a clear area where you can reach the front panel for setup and the rear panel to connect the cables. The multiplexer has an external power supply that requires a properly grounded 120 VAC outlet. The total power cord length is about 12 feet. Setup Setup of the SRX Host Multiplexer can be done using the front panel controls and LCD display or by using a terminal connected to the...
  • Page 8 3.4.2 Multiple Host The multiple host configuration allows more than one host multiplexer to be connected to the multidrop line. This requires a Modem Sharing Unit. The SRX Host multiplexers are connected to the MSU ports using the “Modem to Composite” cable. The MSU is connected to the Modem or DSU/CSU using the male to female RS-232 cable.

  • Page 9: Section 4 - Front Panel Controls And Indicators

    FRONT PANEL CONTROLS AND INDICATORS Controls 4.1.1 Keys The NEXT key is used to cycle between top level displays. The ARROW key (→) moves the cursor to the next parameter field. The INCR key is used to cycle through the various options available. The OK! key is pressed to accept the selected value or to enable or disable the selected test.
  • Page 10 Home Display The HOME display is the SRX default display. It shows the product name and the number of ports. Pressing the Arrow key will display firmware version information. Press Arrow again to return to the home display. MAP Host Port The MAP Host Port screen shows the mapping between the local port numbers and remote port numbers.
  • Page 11 Drop Activity The DRoP activity display shows the poll/fail counts, the block counts, and the error counts for any active drop. The INCR key selects which drop and count to display. There are three options; Poll/Fail, Blocks, and Errors. Flow Status The FLOW status screen shows the flow control status for each host port.
  • Page 12 Indicators OPTION Not Used MODEM READY Modem is on line. No DCD from the attached modem. FLASHING FAST Composite link is active but there are ten blocks of data outstanding without a response from the remote multiplexer. FLASHING SLOW Problem with the composite link. LINE ERROR Flashes when data error is detected.

  • Page 13: Section 5 - Network Management Port

    NETWORK MANAGEMENT PORT Introduction The Network Management port (NMP) provides all of the front panel functions plus the following: • Show Network Status • Change Network Configuration • Assign IDs to both the local and remote multiplexer and to individual ports •...
  • Page 14 Using the Network Management port To activate the NMP, press the ENTER key. When you see AT YOUR COMMAND >>, the NMP is active and ready for your commands. Type H <Enter> to display the command set. Commands 5.4.1 Help COMMAND LOCAL REMOTE PARAGRAPH...
  • Page 15 NOTE Several commands allow port numbers or port number ranges to be included on the command line. When port numbers are included, the syntax is as follows: (Command)1 Port 1 (Command)1,2,6 Ports 1, 2 & 6 (Command)1 2 6 Ports 1, 2 & 6 (Command)2-6 Ports 2 thru 6 (Command)1,5-8...
  • Page 16 5.4.7 Show Map The Show Map (SM) command shows the mapping, IDs and status of all host ports. If mapping for a particular port(s) or range is desired, that port number or range may be added to the command line. If mapping for a specific drop is desired, use the SMD# command.
  • Page 17 5.4.12 Change Restart Timer The (Change) Restart Timer (CT) setting determines how frequently the host polls drops that have been removed from the from active list. When this time interval expires, the SRX polls each inactive drop once. If the drop responds, that drop is returned to the active polling list. If the drop fails to respond, it remains on the inactive list.
  • Page 18 The BYE command toggles the RTS output from the Network Management port. This is used to disconnect equipment such as dial-up modems or the DCB Access Switch. 5.4.19 Test Tools The Test Tools (TT) menu summarizes the test and troubleshooting commands.
  • Page 19 5.4.20 Capture Port The Capture Port command (CA#) permits the network management port to capture any of the local ports. While this command is active, the normal data path is interrupted and a two-way communication link is established between the network management port and the captured host port.
  • Page 20 5.4.24 Show RS-232 The Show RS-232 (SR) command shows the current state of RS-232 control signals on the local ports. A range of port numbers may be included to limit the display. 5.4.25 Remote Show RS-232 The Remote Show RS-232 (RSR) command shows the status of RS-232 control signals at the remote ports.
  • Page 21 5.4.30 Parity The Parity command (P) sets the parity for the network management port. The factory default is SPACE. 5.4.31 Drop History Drop History (DH) displays a table of the last 64 occurrences of a Drop being dropped from the poll sequence (inactive) or being reinstated (active).
  • Page 22 5.4.36 Port Reset The Port Reset (PR) command is used to reset flow control to hung ports. A range of host port numbers or ALL may be included with this command. Flow control leads at both the host and drop ports are reset. 5.4.37 Reset Mux The Reset Mux (RESET) command performs a local multiplexer reset.

  • Page 23: Section 6 - Interface Signals And Cabling

    INTERFACE SIGNALS AND CABLING Connector Location and Pin Reference NETWORK POWER COMPOSITE MANAGEMENT 1 2 3 4 5 6 7 8 SR-16 Rear Panel and RJ-45 Jack RJ-45 Plug Positions...
  • Page 24 Port Interface 6.2.1 Composite Port (RJ-45) Signal In/Out Receive Clock Transmit Clock Data Carrier Detect Signal Ground Transmit Data Receive Data Request to Send Clear to Send 6.2.2 Data Ports (RJ-45) Signal In/Out Data Set Ready Data Carrier Detect Busy Signal Ground Receive Data Transmit Data...
  • Page 25 Cables 6.3.1 Composite Port to Modem A two foot composite to modem cable is included with each SRX multiplexer. The configuration is as follows: Modem RJ-45 DB-25P 6.3.2 Data Ports to Host Computer Configured as DTE Computer RJ-45 DB-25 (or other flow control output pin) (or other flow control input pin) (or 20 if 4 is flow control)
  • Page 26 6.3.2 Data Ports to Host Computer, continued Configured as DCE Computer RJ-45 DB-25 (or 4 if 20 is flow control) (or other flow control output pin) (or other flow control input pin) To a PC Com Port Computer RJ-45 DB-25S DE-9S...
  • Page 27 6.3.3 Network Management Port To a TERMINAL Terminal RJ-45 DB-25P To a PC using terminal emulation Computer RJ-45 DE-9S DB-25S To a dial-up MODEM for remote access Modem RJ-45 DB-25P...
  • Page 28 Signal Paths through Multiplexers The following diagram shows the signal flow between data ports of an SRX Host multiplexer and an SPL Drop multiplexer. SRX Host Port SPL Drop Port BUSY BUSY Transmit Data to Receive Data is the normal required path for data flow.

  • Page 29: Section 7 - Troubleshooting

    TROUBLESHOOTING General Approach When troubleshooting problems, a rational plan can save you many hours of frustration. The following is a brief outline of standard troubleshooting procedures. 1. Gather the facts to determine the exact nature of the problem. 2. Draw a picture of the system showing the equipment at both the host and remote ends and the phone lines or in-house wiring.
  • Page 30 Installation Troubleshooting, Modems or DSUs First, set up the DSUs without connecting the multiplexers. The host DSU should be set to constant carrier, also called forced Request To Send, or constant RTS. The remote DSUs must be set to Request To Send controlled by the terminal.
  • Page 31 If the terminal gets “garbage” data, check the speeds of the host and remote multiplexers, the terminal and the computer ports to make sure they match. Blocks of data are lost most often when data is sent to a printer or a lot of data is being displayed on a terminal.

  • Page 32: Section 8 - Warranty

    Material Authorization (RMA) number. To receive an RMA number, call (217) 897-6600 between the hours of 8 AM and 5 PM central time. Equipment must be shipped prepaid to DCB and will be returned at DCB's expense. Ship returned items to:...

  • Page 33: Appendix - Multidrop Map Worksheet

    DCB MultiDrop Multiplexer Map Worksheet Host Host Port ID Remote Remote Remote Port ID Port # Drop # Port #...

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