D-Link 1824i User Guide
D-Link 1824i - Hub - EN Manual
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- D-Link 1824i | User Guide - Page 1
10BASE-T Stackable Hubs Intelligent Series User's Guide Rev. 02w (Oct., 2004) 6SNMPT....01 Printed In Taiwan RECYCLABLE - D-Link 1824i | User Guide - Page 2
. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with this user's guide, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which - D-Link 1824i | User Guide - Page 3
10BASE-T Stackable Hubs TABLE OF CONTENTS 0 ABOUT THIS GUIDE vi Overview of the User's Guide vi 1 INTRODUCTION 1-1 Overview 1-1 Media Connection Flexibility 1-1 Stackability and Manageability 1-2 Innovative Display 1-2 Security ...1-2 Highlights 1-3 General Highlights of the Intelligent - D-Link 1824i | User Guide - Page 4
10BASE-T Stackable Hubs Replacing the Power Supply 3-5 4 BUILDING HUB STACKS 4-1 Hub Roles 4-1 Position Within the Stack 4-2 Master Hub Roles 4-2 Slave Hub Roles 4-3 Hub ID...4-4 Daisy-chaining Hubs into a Hub Stack 4-4 Segmenting Hubs 4-5 5 NETWORK CONNECTIONS 5-1 Connecting Stations to - D-Link 1824i | User Guide - Page 5
10BASE-T Stackable Hubs Hub Stack Configuration 6-16 Primary and Backup Master Hubs 6-16 Controlling Hubs in the Hub Stack 6-17 Controlling Individual Ports 6-19 Segmenting Hubs 6-23 Monitoring the Hub Stack 6-24 Displaying Segment, Group, and Port Statistics 6-21 Displaying Node Tracking - D-Link 1824i | User Guide - Page 6
Managed hubs. This series includes: ♦ the 12/24-port stackable managed master hub, and ♦ the 12/24-port standard hub. In this User's Guide, the Intelligent Series stackable hubs are frequently described simply as "hub" or "hubs" wherever the text applies to both models. Model numbers are normally - D-Link 1824i | User Guide - Page 7
and electrical specifications of the hubs. ♦ Appendix B. Power-On Self Test Provides information about the POST messages used for troubleshooting problems with the hub. ♦ Appendix C. Boot Configuration File Describes the hub boot configuration file. ♦ Appendix D. Cables and Connectors Describes - D-Link 1824i | User Guide - Page 8
- D-Link 1824i | User Guide - Page 9
solution by maximizing network performance. Overview Important features of the Intelligent Series include: Media Connection Flexibility The Intelligent Series hubs support multiple Ethernet media types, with twelve or twenty-four ports for twisted-pair cabling, and one AUI port which provides - D-Link 1824i | User Guide - Page 10
partitioning status, bandwidth utilization, collision ratio, runt occurrences, and data transmission errors. Security The Intelligent Series supports intrusion control. Intrusion Control prevents unauthorized individuals from accessing the network. Through the network management software, Ethernet - D-Link 1824i | User Guide - Page 11
removal of a recessed transceiver or cable. ♦ Clear, easy-to-read front panel display provides comprehensive diagnostic indication of network status, allowing managers to diagnose and troubleshoot instantly. Introduction 1-3 - D-Link 1824i | User Guide - Page 12
Automatic voltage selection (100V-240V AC, 50-60Hz) without fuse changes or manual voltage range settings. ♦ Slim profile, usable as a standalone desktop unit or for out-of-band management. (Telnet network management is also supported.) The RS-232 serial communication port can be configured as - D-Link 1824i | User Guide - Page 13
10BASE-T Stackable Hubs ♦ Redundant Backup Management ◊ To maximize management uptime, two master hubs can be put in the same stack. If the first one goes down, the backup hub can automatically take over to provide uninterrupted traffic monitoring and network control. Introduction 1-5 - D-Link 1824i | User Guide - Page 14
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variations in the appearances of the front and back panels between hubs in the series. Only the 24-port models are depicted in this User's Guide. Front and Back Panel Layouts LED Panel Uplink Switch 10BASE-T Ports Figure 2 -1 Front Panel Layout Setting Up the Hub 2-1 - D-Link 1824i | User Guide - Page 16
10BASE-T Stackable Hubs AUI Connector Console Port Expansion Module Port Removable Power Supply Daisy-chain Port Figure 2 -2 Back Panel Layout The following components are found on the front and back panels of the hubs: ♦ Ethernet Ports Used for connecting the hub to network devices using 10BASE - D-Link 1824i | User Guide - Page 17
10BASE-T Stackable Hubs ♦ AUI Port Used when connecting the hub to a 10BASE5 "thick Ethernet" backbone, or to other types of Ethernet media. The recessed AUI port accommodates most standard transceivers (also known as Media Access Units or MAUs), allowing the transceiver to be safely and - D-Link 1824i | User Guide - Page 18
when the port is connected to a powered Ethernet station. If the station to which the hub is connected is powered off, or if there is a problem with the link, the indicator is off. ◊ Receive The indicator of a port blinks green when the port is currently receiving packets on the connected segment - D-Link 1824i | User Guide - Page 19
it, for example to prevent a certain device from accessing the network or to reduce network traffic. No incoming packet transmission can occur on a manually partitioned port. Ports can be partitioned and re-enabled using an SNMP-based network management system, or using the console menu interface - D-Link 1824i | User Guide - Page 20
be useful for identifying a specific hub or a hub stack within a large bank of hubs. ♦ Segmented The Segmented indicator lights when the entire hub has been manually segmented off from the rest of the network. Normally the hubs are 2-6 External Features and Indicators - D-Link 1824i | User Guide - Page 21
10BASE-T Stackable Hubs connected together into a single Ethernet "collision domain" through the daisy chain connectors on the back. Segmenting a hub places it in its own collision domain, while allowing it to be managed with the rest of the stack. External Features and Indicators 2-7 - D-Link 1824i | User Guide - Page 22
reduce the bandwidth of the network, and may indicate that the network is overloaded or that there is some sort of hardware or wiring problem. The Col Ratio is only displayed on the manageable hub models; on all models, however, the Col indicator will blink when a collision occurs. 2-8 External - D-Link 1824i | User Guide - Page 23
10BASE-T Stackable Hubs 3 3 SETTING UP THE HUB This chapter explains how to choose a place for your hub stack and how to set up your hubs. Power and Environmental Requirements The hubs feature an auto-selecting 100-240 V, 50-60 Hz power supply unit, which works in most countries around the world. - D-Link 1824i | User Guide - Page 24
10BASE-T Stackable Hubs ♦ Tandem blade ♦ Grounding type attachment plug rated at 15 A, 250V When using a 230V power source outside of the U.S., use a cord with the following characteristics: ♦ 18 AWG ♦ Grounding attachment plug rated at 15A, 250V ♦ The cord should have the appropriate safety - D-Link 1824i | User Guide - Page 25
10BASE-T Stackable Hubs Free-standing Installation If you are installing the hub as a free-standing unit, apply the four selfadhesive rubber feet to the bottom of the hub chassis. Make sure the bottom surface of the chassis is clean and dry. Stand the chassis up-on-end and attach one rubber foot - D-Link 1824i | User Guide - Page 26
10BASE-T Stackable Hubs Installing the Transceiver Tray At the rear of the hub, there is an AUI connector designed for connecting the hub to various types of Ethernet media such as thick Ethernet coaxial cable (10BASE5), thin Ethernet coax (10BASE2), or fiber optic cabling (10BASEFL). The AUI - D-Link 1824i | User Guide - Page 27
10BASE-T Stackable Hubs Replacing the Power Supply The hub comes with a removable power supply for easy replacement. In the unlikely event that the power supply fails or is damaged, follow the steps below to replace the power supply. 1. Disconnect the power cord from the AC outlet. 2. Disconnect the - D-Link 1824i | User Guide - Page 28
- D-Link 1824i | User Guide - Page 29
, how to connect the hubs using the Daisy-Chain ports, and how to divide hubs in the stack into separate segments. Hub Roles The series supports both master and slave hubs. In addition, more than one master hub can be placed in a single hub stack. Therefore, a hub in the stack Building - D-Link 1824i | User Guide - Page 30
10BASE-T Stackable Hubs can take on different roles depending on the type of hub it is and its position in the hub stack. Position Within the Stack Hubs in the hub stack are connected using the daisy-chain ports located at the rear of the hub. Each hub has an IN port and an OUT port. Hubs are - D-Link 1824i | User Guide - Page 31
10BASE-T Stackable Hubs another master hub upstream. If it receives commands from a master hub, it becomes a Standby Master, controlled by the Active Master. If it does not receive any commands, or if the Active Master hub fails, it will become the Active Master. Note that even if there are more - D-Link 1824i | User Guide - Page 32
10BASE-T Stackable Hubs When there is a working Active Master in the stack, then each slave hub in the stack will be a Managed hub controlled by the Active Master hub, and will have its own Hub ID. Hub ID Hub ID numbers, displayed on the front of the hub, are determined automatically by the master - D-Link 1824i | User Guide - Page 33
10BASE-T Stackable Hubs Figure 4 -2 Daisy-Chaining Hubs Segmenting Hubs The emergence of Ethernet switching hub technology has made it more common to segment local area networks into smaller pieces to reduce congestion on each segment. This makes it easier to balance network loads, since a smaller - D-Link 1824i | User Guide - Page 34
10BASE-T Stackable Hubs Figure 4 -3 All Hubs Connected to Ethernet Backbone Figure 4 -3 shows an unsegmented stack of hubs. All hubs in the stack are in the same collision domain because they are connected together using the daisy-chain ports and they have not been segmented. Figure 4 -4 shows a - D-Link 1824i | User Guide - Page 35
using the console interface, see Chapter 6 in this User's Guide. For information about segmenting hubs using the network management module for the hub , see the management module's User's Guide. NOTE: Hub segmentation is controlled by the master hub. While - D-Link 1824i | User Guide - Page 36
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10BASE-T Stackable Hubs 5 5 NETWORK CONNECTIONS Once you have set up your hubs and connected them into a stack, you are ready to connect network stations, and to connect your hub to the rest of your Ethernet network. This chapter tells how to connect workstations to the hub, and the hub to the - D-Link 1824i | User Guide - Page 38
10BASE-T Stackable Hubs Plug the RJ-45 connector at one end into the network station, and the other end into a free 10BASE-T port on the front of the hub. When both the hub and the device at the other end of the connection are turned on, and the cable is connected at both ends, then the Link - D-Link 1824i | User Guide - Page 39
10BASE-T Stackable Hubs Cascading Hub Stacks If you need to expand your network beyond an eight-port stack, or you need to connect your hub to other parts of your network, you can cascade it using several different network media, including 10BASE-T twisted-pair cabling, 10BASE2 thin coaxial cabling, - D-Link 1824i | User Guide - Page 40
10BASE-T Stackable Hubs This means you can cascade to another hub using an ordinary straightthrough twisted-pair cable. Figure 5 -2 Uplink Switch Setting When using this method, set the Port 1 Uplink switch to MDI, connect one end of the straight-through cable Port 1 of the hub, and connect the - D-Link 1824i | User Guide - Page 41
10BASE-T Stackable Hubs Using Thin Coaxial Cabling With the addition of a 10BASE2 transceiver connected to the AUI port at the rear of the hub (as described in Chapter 3), you can cascade the hub to other hubs or stations using thin coaxial cabling. This method of cascading hubs gives additional - D-Link 1824i | User Guide - Page 42
10BASE-T Stackable Hubs When connecting a transceiver to the hub, the transceiver's SQE (heartbeat) function should be disabled. Multilevel Cascading Hubs can be cascaded in multiple levels, provided no path between stations on the network goes through more than four repeaters. For example, a - D-Link 1824i | User Guide - Page 43
10BASE-T Stackable Hubs 6 6 USING THE CONSOLE INTERFACE Your Intelligent stackable Ethernet hub supports a console management interface that allows you to set up and control your hub, either with an ordinary terminal (or terminal emulator), or over the network - D-Link 1824i | User Guide - Page 44
10BASE-T Stackable Hubs ♦ 8 data bits ♦ No parity ♦ One stop bit You can also access the same functions over a Telnet interface. Once you have set an IP address for your hub, you can use a Telnet program (in a VT100 compatible terminal mode) to access and control the hub. All of the screens are for - D-Link 1824i | User Guide - Page 45
10BASE-T Stackable Hubs Logging In to the Hub Console The Intelligent Series master hubs support user-based security that can allow you to prevent unauthorized users from accessing the hub or changing its settings. This means that before you can - D-Link 1824i | User Guide - Page 46
10BASE-T Stackable Hubs 3. With the cursor on the OK selection, press Enter. The main menu screen will be displayed. NOTE: When the hub is shipped from the factory, the default user name is SNMP-T and the default password is also SNMP-T. You will need to use this user name and password when you - D-Link 1824i | User Guide - Page 47
10BASE-T Stackable Hubs Changing your Password To change your user password: 1. Choose User Account Change from the main menu. 2. Choose Change Password. Figure 6 -3 Change Password 1. Type in your user name and press Enter. 2. Type in your old password and press Enter. 3. Type in the new password - D-Link 1824i | User Guide - Page 48
10BASE-T Stackable Hubs This method can also be used by a Super User to change another user's password. Setting up the Master Hub This section describes the settings you will need to change to allow you to be able to manage the hub from an SNMP-based Network Management System such as SNMP-View, - D-Link 1824i | User Guide - Page 49
10BASE-T Stackable Hubs ♦ Default Gateway: IP address that determines where frames with a destination outside the current subnet should be sent. This is usually the address of a router or a host acting as an IP gateway. If your network is not part of an internetwork, or you do not want the hub to be - D-Link 1824i | User Guide - Page 50
10BASE-T Stackable Hubs Out-of-band management and console settings You can use the Out-of-Band/Console Setting menu to choose whether to use the hub's RS-232C serial port for console management or for out-of-band TCP/IP communications using SLIP, and to set the bit rate used for SLIP communications - D-Link 1824i | User Guide - Page 51
10BASE-T Stackable Hubs Figure 6 -5 Out-of-Band/Console Setting Menu Software Updates The hub is capable of obtaining its boot-time configuration information, as well as updated versions of its internal firmware, using TFTP (the Trivial File Transfer Protocol) and BOOTP (the BOOTstrap Protocol). - D-Link 1824i | User Guide - Page 52
server. For more information about SNMP configuration files, consult Appendix C. For detailed information about using the TFTP and BOOTP servers, consult the SNMP-View User's Guide. Figure 6 -6 Software Update Menu 6-10 Using the Console Interface - D-Link 1824i | User Guide - Page 53
10BASE-T Stackable Hubs SNMP Information The System Configuration Menu screen shows various pieces of information about your hub, and allows you to set the System Name, System Location, and System Contact. These settings can be retrieved from the hub using SNMP requests, allowing these settings to - D-Link 1824i | User Guide - Page 54
10BASE-T Stackable Hubs The System Configuration Menu also contains the Console/Telnet Display Timeout parameter, which determines how long the console may sit idle before the user is "logged out." SNMP Traps The hub sends out SNMP traps to network management stations whenever certain exceptional - D-Link 1824i | User Guide - Page 55
10BASE-T Stackable Hubs ♦ Status: determines whether this trap entry is valid or invalid. You can delete an entry by changing its status to Invalid. SNMP Security (Community Names) SNMP (version 1) implements a rudimentary form of security by requiring that each request include a community name. A - D-Link 1824i | User Guide - Page 56
10BASE-T Stackable Hubs Adding and Deleting Users Access to the console, whether using the console port or via Telnet, is controlled using a user name and password. Up to three of these user names can be defined. One user, named SNMP, is defined by default; this user name can be removed if desired. - D-Link 1824i | User Guide - Page 57
10BASE-T Stackable Hubs Figure 6 -11 Create New User 1. Choose SAVE and press Enter to let the user addition take effect. 2. Choose EXIT to leave the Create New User menu. To delete a user, 1. Choose User Account Change from the main menu. 2. Choose Delete Users from the User Account Change menu. - D-Link 1824i | User Guide - Page 58
10BASE-T Stackable Hubs Figure 6 -12 Delete User 1. Choose SAVE and press Enter to let the user addition take effect. 2. Choose EXIT to leave the Delete Users menu. Hub Stack Configuration Several important hub parameters useful in the day-to-day management of the hub can be viewed and controlled - D-Link 1824i | User Guide - Page 59
10BASE-T Stackable Hubs Figure 6 -13 Primary/Backup Master Menu Controlling Hubs in the Hub Stack The Group Configuration Menu screen, found within the Network Monitoring menu, displays information about each of the hubs in the stack, and allows you to make the Hub ID indicator flash. The items - D-Link 1824i | User Guide - Page 60
10BASE-T Stackable Hubs ♦ Group Port Capacity: shows the total number of controllable ports (includes the UTP ports, AUI ports, an internal management port, etc.) ♦ Group Hardware Revision: shows the design version of the hub hardware. ♦ Group Status: shows whether the hub is up or down. ♦ Group - D-Link 1824i | User Guide - Page 61
10BASE-T Stackable Hubs You can use the PREV GROUP and NEXT GROUP commands to switch to another hub, or you can enter the hub's Group ID number directly into the Group ID field. Controlling Individual Ports The Port State Menu, accessible from the Network Monitoring menu, allows you to view the - D-Link 1824i | User Guide - Page 62
to excessive errors, and Off if the port is operating normally. ♦ Admin State: this toggle determines whether the port should be enabled or disabled (manually partitioned). Setting the Admin State to Disabled will isolate the port from the rest of the network. Figure 6 -15 Port State Menu You can - D-Link 1824i | User Guide - Page 63
the hub is now in a separate collision domain. More information on segmenting hubs can be found in Chapter 4. Monitoring the Hub Stack The hub supports several monitoring functions, allowing you to keep statistics on the operation of each port, each hub, and the entire network segment, as well as - D-Link 1824i | User Guide - Page 64
: ♦ Too Long Frame: counts frames longer than the 1518-byte (octet) limit set by the Ethernet standard. This is likely caused by a software problem. ♦ Very Long Event: counts events where a signal is received longer than the jabber lockup protection timer (4-7.5 ms). This may indicate noise on the - D-Link 1824i | User Guide - Page 65
(Data Rate Mismatch): counts events where there is a frequency mismatch between the received signal and the hub's internal clock. This may indicate a hardware problem in the hub or in an Ethernet interface. ♦ SFD Missing: counts frames longer than 10 bytes without a valid Start of Frame Delimiter - D-Link 1824i | User Guide - Page 66
10BASE-T Stackable Hubs ♦ Broadcast Frame: counts valid frames that are broadcast to all stations on the network. ♦ 64 Octs, 65-127 Octs, 128-255 Octs, 256-511 Octs, 512-1023 Octs, 1024-1518 Octs: Counts frames of various length ranges, both valid and invalid. ♦ Readable Oct: counts the total number - D-Link 1824i | User Guide - Page 67
10BASE-T Stackable Hubs Displaying Node Tracking Information The Node Tracking Information screen, accessible from the Network Monitoring menu, displays the source and destination addresses of packets recently received on a given port. Ethernet (MAC) addresses are displayed for all packets, and IP - D-Link 1824i | User Guide - Page 68
10BASE-T Stackable Hubs Resetting the Hub You can use the console interface to reset the hub stack, either doing a System Reset (which restarts the hub and is identical to powering the hub off and back on again) or a Factory Reset (which sets all of the hub's parameters to what they were when the - D-Link 1824i | User Guide - Page 69
10BASE-T Stackable Hubs Factory Reset Before performing a factory reset, be absolutely certain that this is what you want to do. Once the reset is done, all of the hub's settings stored in NVRAM (including TCP/IP parameters, SNMP parameters, the enabled/disabled settings of ports, security settings, - D-Link 1824i | User Guide - Page 70
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12 24 1 1 1 No 2 2 SNMPT24i 24 1 1 2 Display Indicators For each TP Port: Link For each TP, AUI Port: Data reception Auto Partition Manual Partition Daisy-chain Link Collision Utilization % Hub Unit ID Standby/Master Console/Out-of-band SNMPT12 Y Y SNMPT12i Y Y SNMPT24 Y Y SNMPT24i - D-Link 1824i | User Guide - Page 72
10BASE-T Stackable Hubs Weight Dimensions Operating Temperature EMI 240VAC, 240VAC, 240VAC, 240VAC, 20W Max, 50W Max, 20W Max, 50W Max, 50/60 Hz 50/60 Hz 50/60 Hz 50/60 Hz 2.4kg 2.7kg 2.5kg 2.8kg 441mm × 44.4mm × 217mm 0 to 50°C FCC Class A, CE, VCCI Level 1 Network Management RFC-1157 - D-Link 1824i | User Guide - Page 73
10BASE-T Stackable Hubs B BPOWER-ON SELF TEST When the master hub is powered on, it does a Power-On Self Test (POST) to verify that all of its components are working properly. As it performs its tests, the test progress is displayed on the terminal console, provided the hub is in console mode. (If - D-Link 1824i | User Guide - Page 74
is not considered a fatal error, and failure will not cause the hub to halt. If any of the self-test items fail, contact your technical service representative for assistance. B-2 Power-On Self Test - D-Link 1824i | User Guide - Page 75
10BASE-T Stackable Hubs When the power-on self-test is completed, the hub begins its boot sequence. If you are using out-of-band software downloading, the hub waits for 5 seconds to give you an opportunity to stop the boot process by pressing Control-C (and blinks the Port 3 and Port 4 frames), - D-Link 1824i | User Guide - Page 76
10BASE-T Stackable Hubs Duplicate IP address detected ◊ F Invalid IP address or subnet mask 1. TFTP Download (Port 3 Frame/Port 9 Frame) The hub uses the TFTP protocol to load its boot configuration file, and optionally the run-time image. This step is omitted if the hub is configured to not use - D-Link 1824i | User Guide - Page 77
10BASE-T Stackable Hubs ordinary memory in preparation for use. This is the last step in the boot process. Error codes in this step include: ◊ 1 Local Flash Download Error (Flash Memory Checksum Error) ◊ 2 Local Flash Download Error (Run Time Image Error) Power-On Self Test B-5 - D-Link 1824i | User Guide - Page 78
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10BASE-T Stackable Hubs C CBOOT CONFIGURATION FILE The master hubs in the series support a powerful configuration file which allows many of the hub stack's configuration parameters to be stored on a centralized server. When the master hub starts up, it - D-Link 1824i | User Guide - Page 80
10BASE-T Stackable Hubs contact information for the person responsible for administering the hub. The string can be up to 64 characters long. ♦ syslocation string Takes string as the System Location, corresponding to the SNMP MIB II variable sysLocation. This field is used to indicate the physical - D-Link 1824i | User Guide - Page 81
10BASE-T Stackable Hubs Enables or disables authentication failure traps for invalid SNMP community names. The argument may be enable or disable. ♦ clear-SNMP-comm-table Clears the hub's SNMP community name table. ♦ SNMP-community community permissions Adds community to the hub's list of SNMP - D-Link 1824i | User Guide - Page 82
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10BASE-T Stackable Hubs D DCABLES AND CONNECTORS Ports 2 through 24 are MDI-X 10BASE-T Ethernet ports. Port 1 is a 10BASE-T Ethernet port, with a sliding switch that enables a connection to a network station (in the MDI-X setting) or to a repeater, bridge, or hub (in the MDI setting). 10BASE-T - D-Link 1824i | User Guide - Page 84
10BASE-T Stackable Hubs 2 RD- (receive) 3 TD+ (transmit) 4 5 6 TD- (transmit) 7 8 TD- (transmit) RD+ (receive) Not used Not used RD- (receive) Not used Not used Workstation (MDI) 1 TD+ 2 TD- 3 RD+ 6 RD- Hub (MDI-X) RD+ 1 RD- 2 TD+ 3 TD- 6 Figure D-2 Straight-through Cable Crossover - D-Link 1824i | User Guide - Page 85
Daisy-chain Cable 10BASE-T Stackable Hubs The hubs use ordinary Category 5 twisted-pair cable with RJ-45 connectors on each end for stacking. All four pairs of the eight-wire cable are used. A 30cm daisy-chain cable is included with the hub; this information is included in case you want to make - D-Link 1824i | User Guide - Page 86
10BASE-T Stackable Hubs Console Port (DCE, DB-9) Terminal/PC Serial Port (DTE, DB-9) DCD (1) RXD (2) TxD (3) DTR (4) SG (5) DSR (6) RTS (7) CTS (8) - (9) DCD (1) RXD (2) TxD (3) DTR (4) SG (5) DSR (6) RTS (7) CTS (8) - (9) Figure D-4 Local Connection to 9-Pin Serial Port Console Port (DCE, DB - D-Link 1824i | User Guide - Page 87
Console Port (DCE, DB-9) 10BASE-T Stackable Hubs Modem (DCE, DB-25) DCD (1) RXD (2) TxD (3) DTR (4) SG (5) DSR (6) RTS (7) CTS (8) - (9) DCD (8) RXD (3) TxD (2) DTR (20) SG (7) DSR (6) RTS (4) CTS (5) Figure D-7 Remote (Modem) Connection to 25-Pin Serial Port Cables and Connectors D-5
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10BASE-T Stackable Hubs
Intelligent Series
User’s Guide
Rev. 02w (Oct., 2004)
6SNMPT
....
01
Printed In Taiwan
RECYCLABLE