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DGS-1520 Series Gigabit Ethernet Smart Managed Switch Hardware Installation Guide

Introduction

Switch Description

Package Contents

Switch Description

The DGS-1520 series is the latest next generation of Smart Managed switches from D-Link. Switches in this series

feature a wide selection of different ports types and speeds that can be used to interconnect a variety of networking

devices to communicate with each other. The SFP+ ports, with fiber-optical cabling, can be used to uplink connections

that may span over great distances. Switches in this series also implement D-Link’s innovative third generation Green

Ethernet technology (IEEE 802.3az) to save power from links that are inactive by turning LEDs off based on a

customized schedule and by allowing ports to enter a hibernated state automatically.

In the

DGS-1520 Series

, the following switches are available:

DGS-1520-28

DGS-1520-28MP

DGS-1520-52

, and

DGS-1520-52MP

. Some features, throughout this guide, will apply to all the switches within the DGS-1520 Series.

When referring to these universal features, we will simply refer to the product as the

Switch

Package Contents

Open the shipping carton of the Switch and carefully unpack its contents. The carton should contain the following

items:

•

One DGS-1520 series switch

•

One AC power cord

•

One AC power cord retainer set

•

One console cable (RJ45 to RS-232)

•

Four rubber feet with adhesive backing

•

One rack mounting kit, containing two brackets and a number of screws

•

One quick installation guide

NOTE:

If any item is missing or damaged, please contact your local D-Link reseller for replacement.

Содержание DGS-1250 Series

Страница 1: ...DGS 1520 Series Gigabit Ethernet Smart Managed Switch Hardware Installation Guide ...

Страница 2: ... received including interference that may cause undesired operation D Link Corporate 17595 Mt Hermann Street Fountain Valley CA 92708 800 326 1688 CE Mark Warning This equipment is compliant with Class A of CISPR 32 In a residential environment this equipment may cause radio interference Avertissement Concernant la Marque CE Cet équipement est conforme à la classe A de la norme CISPR 32 Dans un en...

Страница 3: ...Power to the Switch 14 Installing the AC Power Cord Retainer 14 Connecting PoH to the Switch 17 Installing the Redundant Power Supply RPS 18 Connecting the DPS 700 RPS to the Switch 18 4 Switch Connections 20 Stacking the Switch 20 Switch to Switch 23 Switch to Server 24 Switch to End Node 24 5 Switch Management 25 Management Options 25 Command Line Interface CLI 25 Connecting to the Console Port ...

Страница 4: ...Power Supply RPS Cable 37 Appendix C ERPS Information 38 Safety Sécurité 39 Safety Instructions 39 Safety Cautions 39 Consignes de sécurité 40 Précautions de sécurité 40 General Precautions for Rack Mountable Products 42 Protecting Against Electrostatic Discharge 43 Warranty Technical Support 44 ...

Страница 5: ...s Convention Description Boldface Font This convention is used to place emphasis on keywords It also indicates a button toolbar icon menu menu item system message or a prompt appearing on the screen For example click the Apply button Initial capital letter This convention is used to indicate a window name or keyboard key For example press the Enter key Blue Courier Font This convention is used to ...

Страница 6: ... turning LEDs off based on a customized schedule and by allowing ports to enter a hibernated state automatically In the DGS 1520 Series the following switches are available DGS 1520 28 DGS 1520 28MP DGS 1520 52 and DGS 1520 52MP Some features throughout this guide will apply to all the switches within the DGS 1520 Series When referring to these universal features we will simply refer to the produc...

Страница 7: ... function All unsaved configurations will be lost Press and hold for more than 10 seconds This resets the software configuration on the Switch to the factory default settings Console Port The console port is used to connect to the CLI of the switch The connection is out of band and the console cable included in the package must be used for the connection Figure 2 1 DGS 1520 28 Front Panel This fol...

Страница 8: ... to the DGS 1520 52 Port Type Port Number Description RJ45 Port 10 100 1000 Mbps Ports 1 to 48 This switch is equipped with 48 RJ45 Ethernet ports that can operate at 10 Mbps 100 Mbps and 1 Gbps wire speeds RJ45 Port 1 10 Gbps Ports 49 to 50 This switch is equipped with 2 RJ45 Ethernet ports that can operate at 1 Gbps and 10 Gbps wire speeds SFP Ports 1 10 Gbps Ports 51 to 52 This switch is equipp...

Страница 9: ... their color blinking times and location Figure 2 5 DGS 1520 28 Front Panel LED Indicators Figure 2 6 DGS 1520 28MP Front Panel LED Indicators Figure 2 7 DGS 1520 52 Front Panel LED Indicators Figure 2 8 DGS 1520 52MP Front Panel LED Indicators The front panel LED indicators per device are described in the following table LED Color Status Description Power Green On Solid Power on On Blinking Perfo...

Страница 10: ...ansmitted and received through the port Off Off Inactive connection or no link present Link Act 2 5G 100M 1G PoE Switches Only top of each port Green On Solid Active connection at 2 5 Gbps through the port On Blinking Data transmitted and received through the port Amber On Solid Active connection at 100 Mbps or 1 Gbps through port On Blinking Data transmitted and received through the port Off Off ...

Страница 11: ...king LED Lights solid green when the switch is powered on Then returns to normal operation when the system is ready Link Act Mode LED Lights solid green when the switch is powered on Then returns to normal operation when the system is ready Link Act LEDs Light solid green and amber when the switch is powered on Then blinks green until the system is ready Rear Panel Components The rear panel featur...

Страница 12: ...table lists the front panel components unique to the DGS 1520 28MP Port Description Redundant Power Supply The RPS port can be used to connect an optional external load sharing RPS to the Switch When the internal power fails the external RPS will immediately supply power to the Switch automatically Figure 2 11 DGS 1520 52 Rear Panel This following table lists the front panel components unique to t...

Страница 13: ...Figure 2 13 DGS 1520 28 52 Rear Panel LED Indicators The rear panel LED indicators per device are described in the following table LED Color Status Description Link Act Green On Solid Active connection at 1 Gbps through the MGMT port On Blinking Data transmitted and received through the MGMT port Amber On Solid Active connection at 10 100 Mbps through the MGMT port On Blinking Data transmitted and...

Страница 14: ...ts like heat vents fans and rack mounting screw holes These components are described in detail below The heat vents are used to dissipate internal heat and facilitate internal air circulation Figure 2 14 DGS 1520 28 Side Panels Figure 2 15 DGS 1520 28MP Side Panels Figure 2 16 DGS 1520 52 Side Panels Figure 2 17 DGS 1520 52MP Side Panels ...

Страница 15: ...temperature detected by the sensors built in the Switch s hardware The following table lists at what temperature the speed of the fan s will change Module Low Speed Medium Speed High Speed DGS 1520 28 Below 30 C Above 33 C Below 37 C Above 40 C DGS 1520 28MP Below 30 C Above 33 C Below 37 C Above 40 C DGS 1520 52 Below 30 C Above 33 C Below 37 C Above 40 C DGS 1520 52MP Below 30 C Above 33 C Below...

Страница 16: ...sical and Environmental section Install the Switch in a site free from strong electromagnetic field generators such as motors vibration dust and direct exposure to sunlight Installing the Switch without a Rack This section is used to guide the user through installing the Switch in an area other than a switch rack Attach the included rubber feet to the bottom of the Switch Take note that there shou...

Страница 17: ...d 19 1U rack using the rack mounting kit included in the package contents Fasten the mounting brackets to the sides of the Switch using the screws provided Figure 3 2 Attaching rack mount brackets to the Switch Fasten the mounting brackets in any available open space in the rack using the screws provided Figure 3 3 Installing the Switch in a Rack Make sure that there is adequate space around the S...

Страница 18: ...ction can reach is 100 meters Fiber optic connections can span several kilometers The figure below illustrates how to insert SFP SFP transceivers into the SFP ports Figure 3 4 Inserting transceivers into the transceiver ports NOTE For the full list of D Link SFP SFP transceivers that are supported on the Switch refer to the Supported SFP SFP Transceivers table on page 33 NOTE Only use pluggable op...

Страница 19: ... is booting up In the event of a power failure just as a precaution unplug the power cord from the Switch After the power returned plug the power cord back into the power socket of the Switch Installing the AC Power Cord Retainer To prevent accidental removal of the AC power cord it is recommended to install the AC Power Cord Retainer Set together with the AC power cord The AC Power Cord Retainer ...

Страница 20: ...nstallation Guide 15 Slide the retainer through the tie wrap until the end of the cord Figure 3 7 Slide the Retainer through the Tie Wrap Circle the tie of the retainer around the power cord and into the locker of the retainer Figure 3 8 Circle around the power cord ...

Страница 21: ...DGS 1520 Series Gigabit Ethernet Smart Managed Switch Hardware Installation Guide 16 Fasten the tie of the retainer until the power cord is secured Figure 3 9 Secure the power cord ...

Страница 22: ... port on the back panel NOTE The D Link DPS 520 Managed PSE is the recommended DC power sourcing equipment for the Switch CAUTION Do not connect the RPS to AC power before the PoH cable is connected This might damage the internal power supply ATTENTION Ne branchez pas le RPS sur le courant alternatif avant que le câble PoH ne soit branché Cela pourrait endommager l alimentation électrique interne ...

Страница 23: ... Gigabit switches and can be connected to the RPS port of the Switch using a 22 pin DC power cable A standard three pronged AC power cable connects the RPS to the main power source CAUTION Do not connect the RPS to AC power before the DC power cable is connected This might damage the internal power supply ATTENTION Ne branchez pas le RPS sur le courant alternatif avant que le câble d alimentation ...

Страница 24: ...n No software configuration is required CAUTION Leave at least 15 cm 6 inches of space at the rear of the Switch when an RPS is installed to prevent cable damage ATTENTION Laissez un espace d au moins 15 cm 6 pouces à l arrière du commutateur lorsqu un RPS est installé pour éviter d endommager les câbles NOTE Only the DGS 1520 28MP and DGS 1520 52MP feature a 22 pin RPS port on the back panel Alwa...

Страница 25: ...all reliability serviceability and availability Switches in the series can be physically stacked with optical fiber cables or Direct Attached Cables DACs with SFP connectors Only the last four SFP ports on the Switch can be used for physical stacking The following stacking topologies are supported on the Switch Duplex Chain This topology stacks switches together in a chain link format Using this m...

Страница 26: ... Gigabit Ethernet Smart Managed Switch Hardware Installation Guide 21 In the following diagram switches are stacked in the Duplex Chain topology using the two 10GBASE T ports Figure 4 1 Duplex Chain Stacking Topology ...

Страница 27: ...he same Switch in the stack Splitting logical stacking port pairs between different Switches in the stack might not guarantee a stable stacking connection The following table lists the stacking configuration with the corresponding SIO port pairs Configuration Switch Logical SIO1 Logical SIO2 Bandwidth 2 port 10GBASE T DGS 1520 28 Port 25 Port 26 40 Gbps full duplex DGS 1520 28MP Port 25 Port 26 40...

Страница 28: ...tween different Switches in the stack might not guarantee a stable stacking connection Switch to Switch The Switch can be used to connect to any other switch or hub in the network This network topology is used when the Switch does not have enough ports to cater for all the end nodes in the network There is a great deal of flexibility on how connections are made using the appropriate cabling Connec...

Страница 29: ...ing devices that will be connected to this switch Typical examples of end nodes are Personal Computers PCs Notebooks Access Points Print Servers VoIP Phones and more Each end node should be fitted with an RJ45 networking port Normally end nodes will connect to this switch by using a standard twisted pair UTP STP network cable When a successful connection is established the corresponding port light...

Страница 30: ...onsole port offers an Out Of Band OOB connection to the CLI and the LAN ports offers an in band connection to the CLI using Telnet or SSH NOTE For more information about the CLI refer to the DGS 1520 Series CLI Reference Guide Connecting to the Console Port The Console port is used to connect to the CLI of the Switch Connect the DB9 connector of the console cable included in the packaging to the S...

Страница 31: ...r account use the username command in the Global Configuration Mode Switch configure terminal Switch config username NewUser password 12345 Switch config username NewUser privilege 15 Switch config A user account with the username NewUser password 12345 and privilege level 15 was created NOTE Usernames can be up to 32 characters in length Passwords can be up to 32 plain text characters in length P...

Страница 32: ...HTTP or HTTPS SSL NOTE For more information about the Web UI refer to the DGS 1520 Series Web UI Reference Guide Connecting to the Web UI To access the Web UI open a standard web browser enter the IP address of the Switch into the address bar of the browser and press the Enter key Figure 5 2 IP address in Internet Explorer NOTE The default IP address of the switch is 10 90 90 90 subnet mask 255 0 ...

Страница 33: ... to go to the D Link website AREA 2 In this area a toolbar with access to functions like Save Tools Online Help customized Language preferences and a Logout option is available The user account and IP address currently accessing the Web UI is displayed on the right in this toolbar AREA 3 In this area the software features available in the Web UI are grouped into folders containing hyperlinks that ...

Страница 34: ...SNMP managers can be created to view read only information or receive traps using SNMP version 1 while assigning a higher level of security to another group granting read write privileges using SNMP version 3 Using SNMP version 3 individual users or groups of SNMP managers can be allowed to perform or be restricted from performing specific SNMP management functions The functions that have been all...

Страница 35: ...x DGS 1520 52MP 100 240 VAC 50 60 Hz 6 0 A Max Redundant Power Supply DGS 1520 28 Optional RPS through the MGMT port HDBaseT on the back panel Supports the DPS 520 DGS 1520 52 DGS 1520 28MP Optional RPS through the RPS port 22 pin on the back panel Supports the DPS 700 DGS 1520 52MP Fans The IC Sensor detects the temperature on the switch automatically and adjusts the speed DGS 1520 28 1 fan DGS 1...

Страница 36: ...the Switch to be able to connect to a secure immovable device Insert the lock into the notch and turn the key to secure the lock The lock and cable apparatus should be purchased separately Environment Specifications Feature Description Temperature Operating 5 C to 50 C 23 F to 122 F Storage 40 C to 70 C 40 F to 158 F Humidity Operating 10 to 95 RH non condensing Storage 5 to 95 RH non condensing A...

Страница 37: ...ole port provides out of band access to the CLI using the following settings Baud Rate 115200 default 19200 38400 and 9600 bps Data Bits 8 Stop Bit 1 Parity None Flow Control None RJ45 Ports The RJ45 Ethernet ports provides in band access to the CLI and Web UI interconnect nodes and support the following standards and features Standards IEEE 802 3 10BASE T IEEE 802 3u 100BASE TX IEEE 802 3ab 1000B...

Страница 38: ... is Low Prevents cross port current leakage in a multi port system with DC isolation through the termination circuitry The following classifications apply to IEEE 802 3af at capable devices Class Usage Guaranteed Output Power By PSE 0 Default 15 4 Watt 1 Optional 4 0 Watt 2 Optional 7 0 Watt 3 Optional 15 4 Watt 4 Optional 802 3at Only 30 Watt The total PoE power budget is 370 Watts The total PoE ...

Страница 39: ...BX D Single mode 10 km 1550 nm 1310 nm DEM 330R 1000BASE BX U Single mode 10 km 1310 nm 1550 nm DEM 331T 1000BASE BX D Single mode 40 km 1550 nm 1310 nm DEM 331R 1000BASE BX U Single mode 40 km 1310 nm 1550 nm WDM BiDi SFP Transceivers Product Code Standard Mode Distance TX RX DEM 436XT BXD 10GBASE LR Single mode 20 km 1330 nm 1270 nm DEM 436XT BXU 10GBASE LR Single mode 20 km 1270 nm 1310 nm SFP ...

Страница 40: ...ng diagrams and tables show the standard RJ45 receptacle connector and their pin assignments Figure B 1 Standard RJ45 port and connector RJ45 Pin Assignment Contact MDI X Port MDI II Port 1 RD receive TD transmit 2 RD receive TD transmit 3 TD transmit RD receive 4 1000BASE T 10GBASE T 1000BASE T 10GBASE T 5 1000BASE T 10GBASE T 1000BASE T 10GBASE T 6 TD transmit RD receive 7 1000BASE T 10GBASE T 1...

Страница 41: ...itch to access the command line interface The following diagram and table show the standard RJ45 to RS 232cable and pin assignments Figure B 2 Console to RJ45 Cable RJ45 to RS 232 Cable Pin Assignment Table Contact Console DB9 RS232 RJ45 1 Not Used Not Used 2 RXD Not Used 3 TXD TXD 4 Not Used GND 5 GND shared GND 6 Not Used RXD 7 Not Used Not Used 8 Not Used Not Used ...

Страница 42: ...ector and their pin assignments Figure B 3 RPS 22 pin DC Power Cable RPS 22 pin DC Power Cable Pin Assignment Table Pin Switch RPS 1 54Vrtn 54Vrtn 2 54V 54V 3 12V 12V 4 12V 12V 5 12V 12V 6 12V 12V 7 NC GND GND 8 12Ven 12Ven 9 LS 54V LS 54V 10 54V 54V 11 54Vrtn 54Vrtn 12 GND NC GND 13 GND GND 14 RPS Present Status_2 15 Status_1 RPS PG 16 Status_2 RPS Present 17 RPS PG Status_1 18 GND GND 19 12VRTNs...

Страница 43: ...eters Model Name ERPS Port 1 to 8 Port 9 to 26 Port 27 to 28 DGS 1520 28 Hardware based V V Software based V Model Name ERPS Port 1 to 4 Port 5 to 26 Port 27 to 28 DGS 1520 28MP Hardware based V V Software based V Model Name ERPS Port 1 to 8 Port 9 to 24 Port 25 to 32 Port 33 to 50 Port 51 to 52 DGS 1520 52 Hardware based V V V Software based V V Model Name ERPS Port 1 to 8 Port 9 to 24 Port 25 to...

Страница 44: ...er from the device Keep the system away from radiators and heat sources Also do not block cooling vents Do not spill food or liquids on system components and never operate the product in a wet environment If the system gets wet contact your trained service provider Do not push any objects into the openings of the system Doing so can cause fire or electric shock by shorting out interior components ...

Страница 45: ...power available at the Switch s location 115V 60Hz is used mostly in North and South America as well as Far Eastern countries like as South Korea and Taiwan 100V 50Hz is used mostly in Eastern Japan and 100V 60Hz in Western Japan 230V 50Hz is used mostly in Europe the Middle East Africa and the Far East Consignes de sécurité Veuillez prêter une attention particulière aux consignes de sécurité suiv...

Страница 46: ...ir une mise à la masse appropriée N utilisez pas d adaptateur de prise et n éliminez pas la broche de mise à la masse du câble Si un câble de rallonge est nécessaire utilisez un câble à 3 fils avec des fiches correctement mises à la terre Respectez les caractéristiques nominales de la rallonge ou du bloc multiprise Assurez vous que l intensité nominale totale de tous les produits branchés à la ral...

Страница 47: ...the rack first Make sure that the rack is level and stable before extending a component from the rack Use caution when pressing the component rail release latches and sliding a component into or out of a rack the slide rails can pinch your fingers After a component is inserted into the rack carefully extend the rail into a locking position and then slide the component into the rack Do not overload...

Страница 48: ...chassis The following steps can also be taken prevent damage from electrostatic discharge ESD When unpacking a static sensitive component from its shipping carton do not remove the component from the antistatic packing material until ready to install the component in the system Just before unwrapping the antistatic packaging be sure to discharge static electricity from your body When transporting ...

Страница 49: ...iquidators expressly disclaim their warranty obligation pertaining to the product and in that case the product is being sold As Is without any warranty whatsoever including without limitation the Limited Warranty as described herein notwithstanding anything stated herein to the contrary Submitting A Claim The customer shall return the product to the original purchase point based on its return poli...

Страница 50: ...opyright Statement No part of this publication or documentation accompanying this product may be reproduced in any form or by any means or used to make any derivative such as translation transformation or adaptation without permission from D Link Corporation D Link Systems Inc as stipulated by the United States Copyright Act of 1976 and any amendments thereto Contents are subject to change without...

Страница 51: ...Registration Register your D Link product online at http support dlink com register Product registration is entirely voluntary and failure to complete or return this form will not diminish your warranty rights ...

Страница 52: ...onfiguration Please refer to the user manual to learn more or visit http www mydlink com for more information Also feel free to contact us U S and Canadian customers can contact D Link Technical Support through our website USA http support dlink com Canada http support dlink ca ...

Страница 53: ... ASISTENCIA TÉCNICA SUPPORTO TECNICO TECHNISCHE ONDERSTEUNING POMOC TECHNICZNA TECHNICKÁ PODPORA TECHNIKAI TÁMOGATÁS TEKNISK STØTTE TEKNISK SUPPORT TEKNINEN TUKI TEKNISK SUPPORT ASSISTÊNCIA TÉCNICA ΤΕΧΝΙΚΉ ΥΠΟΣΤΉΡΙΞΗ TEHNIČKA PODRŠKA TEHNIČNA PODPORA SUPORT TEHNIC ТЕХНИЧЕСКА ПОДДРЪЖКА TECHNICKÁ PODPORA ...

Страница 54: ...Indonesia www dlink co id Malaysia www dlink com my Philippines www dlink com ph Vietnam www dlink com vn Korea customers Tel 1899 3540 Monday to Friday 9 30am to 6 30pm Web http d link co kr E mail support kr dlink com New Zealandcustomers Tel 0800 900 900 24 7 Technical Support Web http www dlink co nz E mail support dlink co nz South Africa and Sub Sahara Region customers Tel 27 12 661 2025 086...

Страница 55: ...ch Support support eg me dlink com Kingdom of Saudi Arabia Technical Support 966 1121 70009 General Inquiries info sa me dlink com Tech Support support sa me dlink com Pakistan Technical Support 92 21 34548310 34305069 General Inquiries info pk me dlink com Tech Support support pk me dlink com Morocco Phone office 212 700 13 14 15 Email morocco me dlink com Bahrain Technical Support 973 1 3332904 ...

Страница 56: ...рез Интернет Техническая поддержка компании D Link работает в круглосуточном режиме ежедневно кроме официальных праздничных дней Звонок бесплатный по всей России Техническая поддержка D Link 8 800 700 5465 Техническая поддержка через Интернет http www dlink ru e mail support dlink ru Изготовитель Д Линк Корпорейшн 114 Тайвань Тайпей Нэйху Дистрикт Шинху 3 Роуд 289 Уполномоченный представитель импо...

Страница 57: ...Қазақстан Алматы Құрманғазы к cі 143 үй Тел 7 727 378 55 90 E mail almaty dlink ru Հայաստան Երևան Դավթաշեն 3 րդ թաղամաս 23 5 Հեռ 374 10 39 86 67 Էլ փոստ info dlink am Latvija Rīga Lielirbes iela 27 Tel 371 6 761 87 03 E mail info dlink lv Lietuva Vilnius Žirmūnų 139 303 Tel 370 5 236 36 29 E mail info dlink lt Eesti E mail info dlink ee Türkiye Uphill Towers Residence A 99 Ataşehir ISTANBUL Tel 90...

Страница 58: ...inkla com soporte call center Soporte Técnico de D Link a través de Internet Horario de atención Soporte Técnico en www dlinkla com e mail soporte dlinkla com consultas dlinkla com Clientes de Brasil Caso tenha dúvidas na instalação do produto entre em contato com o Suporte Técnico D Link Acesse o site www dlink com br suporte ...

Страница 59: ...2 6600 0123 8715 台灣網站 http www dlink com tw 台灣電子郵件 dssqa_service dlink com tw 產品保固期限台灣技術諮詢時間維修據點查詢請參考http www dlink com tw 網頁說明香港澳門D Link技術諮詢專線香港技術諮詢服務專線 852 8100 8892 香港網站 http www dlink com hk 香港電子郵件 service cn synnex grp com 香港澳門維修據點查詢請參考http www dlink com hk contact html 網頁說明如果您是其他地區的用戶請參考D Link網站www dlink com 查詢全球各地分公司的聯絡資訊以取得相關支援服務 ...

Страница 60: ...a Dukungan Teknis D Link melalui Internet Pertanyaan Umum sales id dlink com Bantuan Teknis support id dlink com Website http www dlink co id 日本のお客様この度は弊社製品をお買い上げいただき誠にありがとうございます製品に同梱されている保証書の購入元にお問い合わせください中國客戶技術支持中心電話 400 629 6688 家用産品熱線 4006 828 828 企業産品熱線技術支持中心郵箱 dlink400 cn dlink com 各地維修中心地址請登錄官方網站查詢網址 http www dlink com cn 400電話工作時間工作日9 00 19 00 節假日9 00 18 00 ...

Страница 61: ... site 1 employee 2 9 10 49 50 99 100 499 500 999 1000 or more 3 What network protocol s does your organization use XNS IPX TCP IP DECnet Others_____________________________ 4 What network operating system s does your organization use D Link LANsmart Novell NetWare NetWare Lite SCO Unix Xenix PC NFS 3Com 3 Open Cisco Network Banyan Vines DECnet Pathwork Windows NT Windows 98 Windows 2000 ME Windows...

Страница 62: ......

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