Tahoe 289 User manual

User Manual
Tahoe 289
E3/T3/Ethernet Bridge

User Manual
Tahoe 289
E3/T3/Ethernet Bridge

II
Tahoe 289 E3/T3/Ethernet Bridge
Tahoe 289 E3/T3/Ethernet Bridge User Manual
Firmware version 1.0.3
Published January 2008
©2005-2008 Tahoe. All rights reserved.
Trademarks of other companies are used only for explanation and to the owner’s benet, without
intent to infringe.
THE SPECIFICATIONS AND INFORMATION REGARDING THE PRODUCTS IN THIS MANUAL ARE
SUBJECT TO CHANGE WITHOUT NOTICE. ALL STATEMENTS, INFORMATION AND RECOMMENDA-
TIONS IN THIS MANUAL ARE BELIEVED TO BE ACCURATE, BUT ARE PRESENTED WITHOUT WAR-
RANTY OF ANY KIND, EXPRESSED OR IMPLIED, AND TAHOE MAKES NO COMMITMENT TO UPDATE
THE INFORMATION CONTAINTED HERE.
NOTWITHSTANDING ANY OTHER WARRANTY HEREIN, ALL DOCUMENT FILES AND SOFTWARE
OF THESE SUPPLIERS ARE PROVIDED “AS IS”. TAHOE DISCLAIM ALL WARRANTIES, EXPRESSED OR
IMPLIED, INCLUDING, WITHOUT LIMITATION, THOSE OF MERCHANTABILITY, FITNESS FOR A PAR-
TICULAR PURPOSE AND NONINFRINGEMENT OR ARISING FROM A COURSE OF DEALING, USAGE,
OR TRADE PRACTICE.
IN NO EVENT SHALL TAHOE BE LIABLE FOR ANY INDIRECT, SPECIAL, CONSEQUENTIAL, OR INCI-
DENTAL DAMAGE, INCLUDING, WITHOUT LIMITATION, LOST PROFITS OR LOSS OR DAMAGE TO
DATA ARISING OUT OF THE USE OF, OR INABILITY TO USE THIS MANUAL.

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Tahoe 289 E3/T3/Ethernet Bridge
Safety Instructions
Read the following safety notices before installing or operating the device:
is warning symbol means danger. You are in a situation that could cause bodily injury. Before you
work on any equipment, be aware of the hazards involved with electrical circuitry and be familiar
with standard practices for preventing accidents.
Read the installation instructions before you connect the device to its power source.
Reliable earthing of this equipment must be maintained.
is product relies on the building’s installation for short-circuit (overcurrent) protection. Ensure that
a fuse no larger than 240 VAC, 16A is used.
Check nameplate ratings to ensure there is no overloading of supply circuits that could have an eect
on overcurrent protection and supply wiring.
ere is no physical circuit separation if the outlet is disabled. Always disconnect the power cord be-
fore removing the cover of any powered device.
Immediately disconnect the unit from the outlet and contact qualied service personnel if
any of the following events are noted:
1. e power cord has become frayed or damaged.
2. Liquid has been spilled on to the device or the device has been exposed to rain or water.
No serviceable parts inside! Do not attempt to repair or service this device yourself. Internal compo-
nents must be serviced by authorized personnel only.
Do not work on the system, or connect or disconnect cables during periods of lightning activity.

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Tahoe 289 E3/T3/Ethernet Bridge
Contents
Introduction.................................................................................................................................. 1
G.703 interface ...................................................................................................................................... 1
Ethernet interface ................................................................................................................................. 2
LED indicators ...................................................................................................................................... 2
Management ................................................................................................................................. 3
LCD Menu ............................................................................................................................................. 3
Serial Console........................................................................................................................................ 3
Control and settings ..................................................................................................................... 5
G.703 settings ........................................................................................................................................ 5
Ethernet settings................................................................................................................................... 6
Advanced options................................................................................................................................. 7
Reset counters ....................................................................................................................................... 7
Restore settings ..................................................................................................................................... 7
Save settings........................................................................................................................................... 8
Reboot..................................................................................................................................................... 8
Statistics ........................................................................................................................................ 9
Appendix A, Troubleshooting.....................................................................................................11
Appendix B, Technical Specication ......................................................................................... 12
Appendix C, Declaration of Conformity................................................................................... 13

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Tahoe 289 E3/T3/Ethernet Bridge
Preface
About this Manual
is manual contains following chapters:
Chapter 1, Introduction An overview of Tahoe 289
Chapter 2, Management e ways to access and manage the device
Chapter 3, Control and Settings e device settings available for the user
Chapter 4, Statistics Statistics displayed by the device
Appendix A, Troubleshooting Description of typical problems that may occur during
use of the device
Appendix B, Technical Specication Technical parameters of the device
Appendix C, Declaration of Con-
formity
Information about compliance with European standards

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Tahoe 289 E3/T3/Ethernet Bridge
Document Conventions
is manual uses following conventions:
boldface font Commands and keywords
< > Required arguments
[ ] Optional arguments
{ a | b | c } Alternative arguments
[ a | b | c ] Alternative optional arguments
typewriter font Information displayed during a serial or remote connection
boldface
typewriter font
Information to be entered during a management session
LCD font Information displayed on the LCD
Note Notes contain helpful suggestions that may be worth remembering
Caution is symbol means a situation that requires you to be careful.
Otherwise equipment damage or loss of data may occur.
Warning is warning symbol means danger. You are in a situation that
could cause bodily injury. Before you work on any equipment
be aware of the hazards involved with electrical circuitry and be
familiar with standard practices in preventing accidents.

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Tahoe 289 E3/T3/Ethernet Bridge
Introduction
Tahoe® 289 bridges allow connecting two LANs over an E3 / T3 (DS3) line. ey are a cost-eective
alternative to expensive E3 / T3 routers.
Bridges are transparent, that is both interconnected networks appear as a single LAN, as if both
were plugged into the same Ethernet switch.
Tahoe 289 has two network interfaces, the serial WAN G.703 interface and the FastEthernet inter-
face for Local Area Network (LAN) connection.
G.703 interface
e G.703 (WAN) interface consists of two coaxial BNC connectors. One of them is a transmit out-
put (Tx), while the other one is a receive input (Rx). e Tx and Rx connectors should be connected
to the corresponding line terminating the equipment’s Rx and Tx ports.
e WAN interface type – E3 or T3 depends on the device variant and should be specied during
ordering. e data transmission rates are 34.368 Mbps and 44.736 Mbps respectively.
front panel
back panel

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Tahoe 289 E3/T3/Ethernet Bridge
Ethernet interface
e Ethernet interface used for local network (LAN) connection. It may work at speeds of 10 Mbps
(10Base-T) or 100 Mbps (100Base-Tx), in full-duplex or half-duplex mode. e mode of operation
is selected automatically, although a specic setting can be forced. An Automatic ow control is
supported while in full-duplex mode.
LED indicators
Besides the LCD display, the following status LEDs are placed on the front panel:
WAN Rx G.703 receiver activity
Tx G.703 transmitter activity
LAN
Link lit when the device is connected to a LAN
100M LAN connection throughput – lit when 100 Mbps connection speed
is negotiated
Act LAN activity, blinks when data is sent or received

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Tahoe 289 E3/T3/Ethernet Bridge
Management
e Tahoe 289 bridge is equipped with an LCD display/keypad and a serial console (RS232) con-
nector. Both give equivalent access to device settings and statistics.
All setting adjustments take immediate eect. Settings have to be saved before restart with the “Save
setting” option, otherwise previously stored values will be loaded during startup. Factory default
settings may be loaded with the “Factory defaults” option in the “Advanced options” submenu.
LCD Menu
e LCD display with keypad is used to adjust device settings and display statistics. e main LCD
screen is shown below:
e CIR indicator is shown when the Committed Information Rate is set.
An asterisk (*) is shown when there are unsaved settings.
In the second line the current total data rate is displayed.
When the main screen is shown use the Up and Down keys to view other statistics, and press the
Enter key to enter device settings. Options may be shown or adjusted with the keypad as follows:
Up previous option/setting
Down next option/setting
Enter enter a submenu, change a setting, accept a change, perform an action
Esc leave a submenu, cancel a change
Serial Console
e serial console gives access to all device settings and statistics via the interactive terminal screen.
Any VT100 compatible terminal may be used to access the device. To connect use a DB9 null-mo-
dem cable at 9600bps, 8 data bits, no parity, 1 stop bit without ow-control.
e main terminal screen is shown below. It is divided into three distinct sections. e interactive
menu is displayed on the le side of screen, the statistics are displayed on the right side. e bottom
half of the screen is reserved for log messages. e status line below the log shows a quick key map
to assist the operator.
Tahoe 289 CIR *
47512kbps

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Tahoe 289 E3/T3/Ethernet Bridge
Tahoe 289 Statistics
> G.703 settings Total data rate 0kbps
Ethernet settings Tx data rate 0kbps
Advanced options Rx data rate 0kbps
Reset counters Tx frames 0
Restore settings Rx frames 0
Save settings Frame errors 0
Reboot Ethernet state 100BaseT-FD MDIX
Uptime 0d 00h07m48s
Version HW:B FW:1.0.3
Log
0d 00:00:00 Tahoe 289 Rev:B Ver:1.0.3
0d 00:00:00 built Jan 14 2008 15:02:38
0d 00:00:00 Factory defaults loaded.
0d 00:00:01 G703 link up
0d 00:00:03 Ethernet link up
arrows Navigate +/- Change Enter Accept DDefault RRefresh screen
Use the arrow keys to navigate through the menu. Settings can also be adjusted with the plus and
minus keys. Press D for the default setting. Press Enter (or Return) to accept a change.

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Tahoe 289 E3/T3/Ethernet Bridge
Control and settings
Device settings are available from the LCD menu and through the serial console.
G.703 settings
Serial E3 / T3 (DS3) interface settings.
CIR
Committed Information Rate. Limits the transmit data rate to a specied value from 512kbps up to
full link throughput in 512kbps steps.
Transmit clock
Choses the source of the transmitter clock. A local oscillator or a remote clock recovered from the
serial line receiver may be selected. Available settings:
Local Osc. use local reference oscillator
Received clock use recovered clock
Invert clock
Determines on which clock edge data is updated and sampled respectively.
Normal update and sample on rising clock edge
Inverted update and sample on falling clock edge
Inverted Tx update on falling and sample on rising clock edge
Cable length
Indicates cable length for waveform shaping in T3 (DS3) mode. Ignored for E3 converters.
below 70m cable no longer than 70m (225)
above 70m cable longer than 70m (225)

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Tahoe 289 E3/T3/Ethernet Bridge
Loopback
Enables serial loop back (for testing purposes). e following modes are available:
Local local loop back
Remote (line) remote loop back (not using framer)
Remote (frame) remote loop back (using framer)
is setting is not saved.
Ethernet settings
Ethernet interface settings.
Ethernet mode
Selects the speed and duplex mode of the Ethernet interface. Available modes are:
Auto use auto-negotiation, recommended setting
10BaseT-HD force 10Mbps, half-duplex
10BaseT-FD force 10Mbps, full-duplex
100BaseT-HD force 100Mbps, half-duplex
100BaseT-FD force 100Mbps. full-duplex
e auto mode is the recommended setting, but forced modes are also available. When selecting a
forced Ethernet mode, make sure the link partner has the same mode selected as duplex cannot be
detected in such circumstances.
Flow control
Select a ow control to be used on the Ethernet interface, as follows:
Auto ow-control, depends on advertised link partner abilities (recom-
mended setting)
Enabled force ow control
Disabled don’t use ow control
e recommended setting is Auto. When ow-control is enabled and Ethernet is in full-duplex
mode, the device will send and accept pause frames to prevent network congestion.
Receive queue
Changes the size of the Ethernet receive queue in 64kB (32 frames) steps. May be used to adjust
latency in a heavily-loaded network.

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Tahoe 289 E3/T3/Ethernet Bridge
Transmit queue
Changes the size of the Ethernet transmit queue with 64kB (32 frames) step. May be used to adjust
latency in a heavily-loaded network.
Reset connection
Resets the Ethernet interface and reinitializes auto-negotiation if enabled.
Advanced options
Advanced user options.
POST
Power On Self Test,
Enabled self test will be performed on every boot
Disabled self test will not be performed
Disabling POST may shorten startup time. e recommended setting is Enabled.
Factory defaults
Loads the factory default settings.
Upgrade
Enters the rmware upgrade mode. Check Tahoe web site for updates.
Reset counters
Resets frame and error counters.
Restore settings
Restores previously saved settings.

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Tahoe 289 E3/T3/Ethernet Bridge
Save settings
Stores settings to nonvolatile memory.
Reboot
Reboots the device.

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Tahoe 289 E3/T3/Ethernet Bridge
Statistics
e following bridge statistics are available from the LCD menu and through the serial console.
Name Description
Total data rate Total data rate used in kbps.
Tx data rate Transmit data rate used in kbps.
Rx data rate Receive data rate used in kbps.
Tx frames Count of transmitted frames.
Rx frames Count of received frames.
Frame errors Count of frames received with errors.
Ethernet state State of Ethernet link: speed, duplex and cable crossover is displayed.
Uptime Time from device startup in days, hours, minutes and seconds.
Version e hardware revision and rmware version.

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Tahoe 289 E3/T3/Ethernet Bridge

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Tahoe 289 E3/T3/Ethernet Bridge
Appendix A, Troubleshooting
Problem Possible solutions
Serial interface is connected
but there is no link
Make sure Rx and Tx connectors are not swapped. Make sure a
link partner is connected and properly congured
WAN link is detected at only
one end
Make sure both Tx and Rx connectors are properly connected
at both ends
ere is a WAN link, but no
data ows
Check G.703 settings at both ends
LCD shows “Tx fail” Transmit line is shorted at local end, remove the short circuit

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Tahoe 289 E3/T3/Ethernet Bridge
Appendix B, Technical Specification
throughput E3 34.368 Mbps
T3 (DS3) 44.736 Mbps
memory 16MB, SDRAM @100MHz
connectors
G.703 (Rx, Tx) 2x BNC, unbalanced 75 Ohm
Ethernet RJ45
Console DB-9/M
network protocols HDLC
Ethernet interface 10/100Base-T, RJ45 connector
serial console RS-232, DB-9/M connector, 9600bps, 8N1
power consumption 6W
power input 15V DC, 400mA
power supply 100-240V AC, 50/60Hz, 1A
dimensions 200 mm (width) x 45 mm (height) x 130 mm (depth)
environmental
conditions
storage: temperature -20°C to 65°C, humidity 5% to 95%
operation: temperature 0°C to 50°C, humidity 0% to 85%