Cabletron Systems 2H253-25R manual Guidelines for the Rackmount Installation

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Installing the Device

B

C

FAST ETHERNET WORKGROUP SWITCH
		LED
		MODE
		RX-TX
A		DPX-SPD
		PWR
	RESET	CPU
2H253-25R		COM

A = 15 cm (6 in)

B = 57 cm (22.5 in) C = 53 cm (21 in) D = 213 cm (7 ft)

2	4	6	8	10	12	14	16	18	20	22	24
1	3	5	7	9	11	13	15	17	19	21	23

D

2762-02

Figure 3-1 Tabletop or Shelf Installation

3.3.2Rackmount Installation

To install the 2H253-25R in a 19-inch rack, Cabletron Systems includes a strain-relief bracket for cable management and an accessory kit containing the rackmount brackets, and mounting screws to attach the rackmount brackets and strain-relief bracket.

Guidelines for the Rackmount Installation

The installation site must be within reach of the network cabling and meet the requirements listed below:

•An appropriate grounded power receptacle must be located within seven feet of the location.

•Maintain a temperature of between 5°C (41°F) and 40°C (104°F) at the installation site with ﬂuctuations of less than 10°C (18°F) per hour.

To ensure proper ventilation and prevent overheating, leave a minimum clearance space

!of 5.1 cm (2.0 in) at the left, right, and rear of the 2H253-25R.

CAUTION

WARNING

Before installing the 2H253-25R into a rack, ensure that the rack supports the device(s) without compromising the stability of the rack. Otherwise, personal injury and/or equipment damage may result.

3-4Installation

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Contents 2H253-25R SmartSwitch Installation User’s Guide Page Page FCC Notice Cabletron SYSTEMS, INC Program License Agreement Page Page Page Cabletron Systems Limited Program License Agreement Viii Declaration of Conformity Page Contents Troubleshooting Figures Tables About This Guide Using this GuideStructure of this Guide Related Documents XviDocument Conventions Document ConventionsPage Introduction OverviewConnectivity Auto-NegotiationRuntime IP Address Discovery Full Duplex Switched EthernetSmartTrunk Broadcast Suppression Remote Monitoring RmonPort/VLAN Redirect Functions Rate Limiting Flow Control12 802.1 Port Priority Garp Switch OperationSwitching Options ManagementStandards Compatibility Lanview Diagnostic LEDsOptional HSIMs and VHSIMs Year 2000 CompliantGetting Help Network Requirements 10BASE-T Network100BASE-TX Network Installation Unpacking the DeviceInstalling Options Installing the DeviceTabletop or Shelf Installation Guidelines for Tabletop and Shelf InstallationsRackmount Installation Guidelines for the Rackmount InstallationAttaching the Strain-Relief Bracket Rack Mounting the 2H253-25R Connecting Power Redundant Primary AC outlets are On separate circuitsConnecting to the Network Straight Cable Connection Completing the Installation Troubleshooting Using LanviewPWR CPU FDX Troubleshooting Checklist OFFSeries 2E253, 2H252, 2H253, User parameters Position of Mode switch IP address Using the Reset Button Reset ButtonSpeciﬁcations Device SpecificationsPhysical Properties Environmental Requirements Electrical SpecificationsINPUT/OUTPUT Ports COM Port Pinout Assignments Regulatory CompliancePage Optional Installations Mode Switch Bank Settings Required ToolsRemoving the Chassis Cover Removing the Chassis Cover Figure B-1 Removing the Chassis Cover Setting the Mode Switches Switch 6 Forced BootPSimm Upgrade Installing the Dram Simm Locating SIMMsFigure B-4 Installing the Dram Installing Optional Hsim or Vhsim Interface Modules Figure B-5 Hsim and Vhsim Connector LocationsPage Index NumericsIndex-2