Specifications

Contents
Contents .......................................................................................................... 1
Models Covered By This Reference .................................................................... 2
Why You Should Read This Reference ............................................................... 2
Where To Find More Information ...................................................................... 3
Hardware Description ....................................................................................... 3
Switch Overview ......................................................................................... 3
AT-8900 Series Switch Models .................................................................... 5
AT-8948 ..................................................................................................... 5
Online Documentation ...................................................................................... 6
Accessing the CD-ROM and Online Documentation .................................... 6
AT-TFTP Server ................................................................................................... 7
Using Windows Terminal and Windows Hyperterminal ...................................... 8
Switch Start-up ............................................................................................... 11
To log In ................................................................................................... 11
To access help .......................................................................................... 12
Start-up Procedures .................................................................................. 12
RS-232 Terminal Port (ASYN0) ......................................................................... 15
Useful Cables .................................................................................................. 16
RS-232 Terminal and Modem Cables ........................................................ 16
Cables for RJ-45 Ethernet LAN Interfaces .................................................. 17
Test Facility ..................................................................................................... 19
Ethernet LAN Port Tests ............................................................................ 19
Other Interface Tests ................................................................................. 22
Power Supply Units (PSUs) .............................................................................. 23
Port, Connector, and Cable Combinations ...................................................... 24
Troubleshooting .............................................................................................. 24
LEDs and What They Mean ....................................................................... 24
Check these first ...................................................................................... 26
Some common problems and how to solve them ..................................... 27
Expansion Options .......................................................................................... 28
SFP transceivers ........................................................................................ 28
Compact Flash ......................................................................................... 29
Dual In-line Memory Modules (DIMMs) ..................................................... 32
Restricted Procedures ...................................................................................... 32
Lithium Battery ......................................................................................... 32
Installing DIMM ........................................................................................ 32
Testing DIMM ........................................................................................... 35
Diagnostics ............................................................................................... 36
Contacting Us ................................................................................................. 38