Comtrend Corporation CT-520 User manual

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CT-520
SHDSL Router
User’s Manual
Version 3.52_5, 11-27-2002
261014-028

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Preface
This manual is written for software version 3.52_5. It is designed to provide
information to network administrators. It covers the installation, operation and
applications of the CT-520 SHDSL router.
Copyright
Copyright© 2002 Comtrend Corporation. All rights reserved. The content of this
manual is subject to change without notice. The information and messages
contained herein are proprietary to Comtrend Corporation. No part of this
manual may be translated, transcribed, reproduced, in any form, or by any means
without prior written permission by Comtrend Corporation.
Contacting us
The reader is presumed to have a basic understanding of telecommunications. For
product updates, new product releases, manual revisions, software upgrades,
technical support, visit Comtrend Corporation at: http://www.comtrendcorp.com
Technical support
If your modem is malfunctioning or you require technical service please send
Email to: mailto:[e-mail]
Warning
 Before servicing or disassembling this equipment, always disconnect all power
and telephone lines from the wall outlet.
 Use an appropriate power supply and a UL Listed telephone line cord.
Specification of the power supply is clearly stated in Appendix B -
Specification.

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T
TA AB BL LE E O OF F C CO ON NT TE EN NT TS S
CHAPTER 1 OVERVIEW.......................................................................1
1.1 Application..................................................................................... 1
1.2 Faceplate LED Indicators.................................................................. 2
CHAPTER 2 INSTALLATION ................................................................3
2.1 Preparing for Hardware Installation ................................................... 3
2.2 Rear-panel Connections ................................................................... 4
CHAPTER 3 WEB-BASED ACCESS ........................................................5
3.1 Login ............................................................................................ 5
3.2 Web Page Layout ............................................................................ 7
3.3 Password Setup .............................................................................. 8
3.4 Write System Configurations........................................................... 10
3.5 Load Factory Default Values............................................................ 11
CHAPTER 4 CONFIGURING THE LAN INTERFACE...............................12
CHAPTER 5 CONFIGURING THE WAN INTERFACE .............................14
5.1.1 RFC-1483 Bridged Mode .............................................................. 15
5.1.2 RFC-1483 Routed ....................................................................... 16
5.1.3 PPPoA....................................................................................... 17
5.1.4 PPPoE....................................................................................... 19
5.1.5 VC Data Flow Control.................................................................. 21
5.1.6 Setting up an ISP....................................................................... 24
CHAPTER 6 BRIDGING .....................................................................26
6.1 Spanning Tree Protocol .................................................................. 26
6.2 Static Bridging.............................................................................. 27
CHAPTER 7 ROUTING .......................................................................28
7.1 Static Route ................................................................................. 28
7.2 Set-up the RIP function.................................................................. 30
7.3 Displaying the Routing Table........................................................... 32
CHAPTER 8 SNMP.............................................................................33
8.1 Enable SNMP................................................................................ 33
8.2 Disable SNMP ............................................................................... 34

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CHAPTER 9 NAT ...............................................................................35
9.1 Multiple to One ............................................................................. 36
9.2 One to One NAT............................................................................ 37
9.3 Multi-NAT .................................................................................... 38
9.4 Virtual Server............................................................................... 40
CHAPTER 10 DHCP ...........................................................................41
10.1 DHCP Server ............................................................................. 41
10.2 DHCP Relay ............................................................................... 42
CHAPTER 11 DNS PROXY..................................................................43
CHAPTER 12 IGMP ...........................................................................44
CHAPTER 13 MAINTENANCE AND DIAGNOSTICS ..............................46
13.1.1 Software Upgrade and Configuration Backup /Restoration.............. 46
13.2 OAM Loopback........................................................................... 50
13.3 Ping ......................................................................................... 51
13.4 Performance Monitoring .............................................................. 52
13.5 System statistics........................................................................ 52
13.6 TCP-IP statistics ......................................................................... 53
13.7 Interface Monitor ....................................................................... 54
CHAPTER 14 APPLICATION EXAMPLE ...............................................55
14.1 Adding the Static Route (Web) ..................................................... 55
CHAPTER 15 MONITORING THE DEVICE ...........................................57
15.1 Monitoring the SHDSL Line .......................................................... 57
15.2 Performance statistics................................................................. 58
CHAPTER 16 CONSOLE ACCESS ........................................................60
16.1.1 Login ..................................................................................... 60
16.1.2 Keyboard Operations................................................................ 62
16.1.3 Motoring the SHDSL Line Status ................................................ 65
16.1.4 Password Setup....................................................................... 65
16.1.5 Retrieve the Factory Default Settings.......................................... 66
16.1.6 Disable the Web Browser .......................................................... 66
16.1.7 Save the Configurations ........................................................... 67
CHAPTER 17 TELNET ACCESS ...........................................................68
17.1 Setting a Common IP Address...................................................... 68

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17.2 Telnet Access............................................................................. 70
APPENDIX A: SPECIFICATIONS ..........................................................71
APPENDIX B - PIN ASSIGNMENTS ......................................................74
GLOSSARY . ............................................................................75

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CHAPTER 1 Overview
The SHDSL router satisfies the needs of multiple users in small/home offices and
remote/branch offices. It provides symmetrical transmission speeds of up to 2.3
Mbps through a SHDSL connection, over one ordinary telephone line. In addition,
it supports up to 16 virtual concurrent connections to multiple destinations.
The SHDSL router can be used for variety of applications, including video
conferencing, remote training, e-commerce, and other multimedia applications.
Easy configuration and monitoring can be accomplished using the Web browser.
The SHDSL router has full routing capabilities to segment/route IP protocol and is
capable of bridging other protocols. It can be also configured in either server or
client mode enabling point-to-point connectivity between two sites.
1.1 Application
The router can be used for DSLAM and point-to-point applications.
DSLAM Application
Point to Point Application

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1.2 Faceplate LED Indicators
LED Color Mode Function
On AC power input is supplied to this unitPOWER Green
Off Power is not connected
Off Normal status
On An alarm is occurring
ALERT Red
Flash Software downloading or self-testing
On Transmit data or receive data over Ethernet linkACT Green
Off No data transmitted or received over the Ethernet link
COL Yellow On Collision occurs over Ethernet
On The physical link through RJ11 connection cable is
established
Flash SHDSL line is training
LINK Green
Off SHDSL connection not established
On Receive data over SHDSL linkData RX Green
Off No data received over the SHDSL link
On Transmit data over the SHDSL linkData TX Green
Off No data transmitted over the SHDSL link

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CHAPTER 2 Installation
2.1 Preparing for Hardware Installation
The following equipment may be necessary to install the router:
 AC power adapter
A power adapter is shipped with the router.
 LAN connection cable
Use an RJ45 cable to connect the device to a PC or Hub.
 RJ11 cable
An RJ11 cable is needed to connect to the LINE port to the wall outlet.
 Console Port Cable –
An RS-232, DB9-to-DB9 straight-through cable is required to connect the device
to a terminal via the console port.
 VT-100 Compatible Terminal –
This terminal is required to perform the management via the console port. This is
normally a terminal with a VT-100 emulation program, such as Telix and
HyperTerminal Edition5.

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2.2 Rear-panel Connections
Step 1 DSL connection
Connect the supplied telephone cable to the port marked LINE at the back of the
SHDSL router. Connect the other end of the cable to your telephone-line wall
outlet. Ensure your computer is turned on before you connect the DSL line to the
router. A green LED on the front of the device labeled LINK will illuminate steadily.
If the SHDSL LINK LED does not illuminate steadily within one minute of it being
connected, check your cable connections to ensure they are correct and securely
installed.
Step 2 Ethernet connection
Insert one end of the RJ45 Ethernet cable into the port marked LAN on the back of
the SHDSL router. Connect the other end of the cable into your Ethernet Network
Interface Card (NIC) installed in your computer. When the Ethernet connection is
established, the correspondent green LED on the front panel labeled LAN will
illuminate steadily.
Step 3 Power connection
Connect the supplied external AC adapter into the DC power outlet on the back of
the router. Connect the power supply into your wall outlet or surge protector.
Turn on the power switch. After powering on, the router performs a self-test.
Wait for a few seconds until the test is finished, then the router will be ready to
operate. The POWER indicator on the front of the router will illuminate green to
indicate that power is being supplied to the router.
Caution 1: If the router fails to power up, or it malfunctions, first verify that the
power supply is connected correctly. Then power it on again. If the
problem persists, contact our technical support engineers.
Caution 2: Before servicing or disassembling this equipment always disconnect all
power cords and telephone lines from the wall outlet.

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CHAPTER 3 Web-based Access
This section describes how to manage the router via the Web browser from the
remote end. The Web page is best read with a display resolution of 1024 x 768.
To change the resolution you can go to the Microsoft Windows control panel and
click on the Display icon, and change the display settings. You will find the display
settings there.
3.1 Login
STEP 1: Configure your workstation to the same network segment as the router,
if for example the router is set to its default address of 192.168.1.1, we
could set the PC to 192.168.1.133 and subnet mask 255.255.255.0.
STEP 2: Start your Internet browser.
STEP 3: Enter the IP address of the router in the Web address field. For
example, if the IP address is 192.168.1.1, enter http:// 192.168.1.1

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STEP 4: You will be prompted to enter your user name and password. Type your
password, or if the password was not changed, type the default
passwords. The default ADMINISTRATOR user name and password are
root.
STEP 5: After successfully logging in, you will reach the main configuration page.
The left hand side has a menu and the right side is blank.

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3.2 Web Page Layout
On each Web page, there are two areas.
Menu Bar: On the left side of the Web page is the menu bar. It is divided into
two parts: Basic and Advanced. The Basic menu bar sets up the device for quick
setup. The Advanced menu bar configures advance functions such as SNMP,
DHCP server, and DNS proxy. The menu also covers the maintenance function.
Main Window: The main window in middle of the page displays after clicking a
button on the menu bar. It includes the tabs on the top of the window. The tabs
lead to other sub-screens.

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3.3 Password Setup
There are two types of access privileges. A system ADMINISTRATOR is the only
person that can configure, change parameters, monitor, and read the
performance and status of the system. A USER can only monitor and read the
status of the system. The password for access through the Web is the same as for
Telnet access.
To set-up a password, complete the following steps:
STEP 1 Click Change Password on the Basic menu bar.
STEP 2 Enter the passwords for Administrator and User, and confirm the new
password by re-typing the password again.
STEP 3 Click Apply to complete the settings and save the setting by entering the
Save & Reboot screen on the basic menu bar.

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 Terminal Type: When the router is connected to the DSLAM, select CPE.
When the router is connect to a router for point to point application, one of the
devices should be set to CO with the other set to CPE. The default setting is
CPE.
 Console Password: Disabled, a local user does not have to enter a password
to enter the console mode. Enabled, users who attempt to access the
device from the console will be prompted for the password.
 Session Timeout: The console or telnet session will be terminated after this
idle time. It is calculated in minutes. Users need to re-log on to the device
when the session times out. The default setting is zero, which means the
function is disabled.

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3.4 Write System Configurations
The new parameters can function immediately without being saved to the flash
memory. To use these parameters after you restart the router, you must save
them to the flash memory.
To write the configurations, click the Save & Reboot button. Click the Save
button on the main screen. If you need to reboot the device after writing the
configurations, also click the Reboot button.

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3.5 Load Factory Default Values
Caution! If you reset your device to the factory default, any changes to
parameters will be lost and all parameters will revert to their default values.
To retrieve the factory default settings,
STEP 1: Click Erase & Reboot on the Basic menu bar.
STEP 2: Click Erase and Reboot respectively.

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CHAPTER 4 Configuring the LAN Interface
To set-up the Ethernet Interface, follow the descriptions below:
STEP 1: Click LAN Setup on the Basic Menu bar.
STEP 2: Enter the new IP address and Subnet, and click Apply to display the
following screen. [The default IP address is 192.168.1.1, the default
subnet Mask is 255.25.255.0]

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STEP 3: You can click the Change & Reboot button to use the new IP address
and reset the device immediately. This doesn’t need the save action.
Alternatively, you can click the Change button to use the new IP address
but you need to save the new setting before you reset the router. After
the IP address is changed, to be able to use the Web browser or telnet,
make sure your PC’s IP address is set to the same network segment.

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CHAPTER 5 Configuring the WAN Interface
Click WAN Setup on the Basic menu bar and configure the VC to RFC1483
Bridged, RFC1483 Routed, PPPoE or PPPoA.

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5.1.1 RFC-1483 Bridged Mode
To configure a WAN interface for Bridged (RFC-1483 Bridged) mode, complete the
following steps:
STEP 1: Click WAN Setup on the Basic menu bar.
STEP 2: Click RFC-1483 Bridged Mode
STEP 3: Enter values for the following fields:
VPI Enter a value for the vitual path identifier
VCI Enter a value for the virtual channel identifier
LLCEncapsulation: With LLC encapsulation, a link control header is added to the Ethernet
packet that identifies the protocol type (Ethernet). This allows
multiple protocols to be transmitted over the ATM Virtual Circuit.
VC Multiplexing: With VC Multiplexing, no link control header is needed as the ATM
Virtual Circuit is assumed to be carrying a single protocol.
Enable NAPT This function cannot be set for bridge mode.
STEP 4: Click the Add button. The new VC is added in the Current ATM PVC List
on the bottom screen.