Typical ADSL Installation

The ADSL Card is primarily installed to provide fast internet access to subscribers of IRIS system. Each ADSL card can cater to 16 ADSL subscribers. Each card has an uplink Ethernet port, which can be used for connecting to the ISP. There is also a downlink Ethernet port, which is currently not activated. In future, this port can be used for daisy chaining multiple ADSL cards, so that from the IRIS system, there will be a common single uplink port. Another alternative would be to provide an external Ethernet switch for aggregating traffic from all the ADSL line cards and then taking a common uplink from the Ethernet switch to the ISP side.

In many cases, the bandwidth from the ISP is taken in the form of ADSL line from the ISP. Here, the ISP will terminate the bandwidth using an ADSL modem, which will typically have an Ethernet port, which can be used for further distribution of bandwidth. The setup would be as shown below:

Page 1of 11

ISP

ADSL Modem Ethernet Switch

ADSL Line from ISP

Ethernet Cable

Ethernet Cableto uplink port of ADSL Line cards

IRIS IVDX with ADSL Line cards

ADSL Line to subscribers of

IRIS

ADSL modem with POTS

splitter

Ethernet Cable to PC

In some cases, a bandwidth manager and a billing system might also be required. In these scenarios, the setup will be as shown below:

In both the above cases, the ADSL subscribers of IRIS have to be allotted unique private IP numbers. The IP address allocated to the ADSL subscribers of IRIS have to be necessarily from the Private IP bank and they must be unique to the site. For example, IP address range 192.168.1.x is a private IP bank So subscribers can be allotted IP addresses 192.168.1.2, 192.168.1.3 and so on.Configurations required at the subscriber end

At the subscriber end, the PC will be connected to the ADSL modem. If the ADSL modem has an inbuilt splitter, then there would be an RJ11 jack in the modem, for

Page 2of 11

ISP

ADSL Modem Ethernet Switch

ADSL Line from ISP

Ethernet Cable

Ethernet Cableto uplink port of ADSL Line cards

IRIS IVDX with ADSL Line cards

ADSL Line to subscribers of

IRIS

ADSL modem with

POTS splitter

Ethernet Cable to PC

PC with two LAN cards

Bandwidth Manager & Billing

System

Ethernet Cable

connecting the telephone instrument for voice communication. In case of external splitters, the ADSL line from the IRIS ADSL line card will first enter the POTS splitter. The POTS splitter will have two outputs – one will go to the ADSL modem and the other for connecting the telephone instrument.

In the subscriber’s PC, the following parameters are to be configured:a) IP Address of the PCb) Gateway IP address for the PCc) DNS server address

The IP address of the PC should be allocated by the system administrator of the IRIS installation site. This IP Address must be a private IP address and it should be unique for the installations site.

The gateway IP Address to be defined, depends on the type of installation. If the installation is of simple type where no bandwidth managers or billing system are used, then the gateway ip address should be the IP address of the ADSL modem, which is provided by the ISP. It should be noted that this IP address is that of the ISP’s ADSL modem and not the local ADSL modem. This entry will be the same in all the subscriber PCs

In case bandwidth managers and billing systems are used,

The DNS server address will be provided by the ISP. This entry will be the same in all the subscriber PCs

The ADSL modem at the subscriber end should be configured in the bridge mode. The IP address of the subscriber modem should be different from the IP Address of the ISP modem. Although IP address is allocated for each subscriber modem, this will be used only for configuring the modem. Hence all the subscriber modem in an installation site can have the same IP address.

The following section gives more details of how to configure the subscriber ADSL modem.

Page 3of 11

The default IP address of most of the types of ADSL modem is 192.168.1.1. However, pls. Consult the user manual of the modem to find the exact default IP address. All the modems can be configured using a web browser. In the web browser, enter the IP address of the modem. Make sure that the network address of the PC matches with the network address of the ADSL modem. For example, if the IP address of the modem is 192.168.1.1, then make sure that the PC’s IP address is 192.168.1.x.

Tip: To ensure that the Ethernet link between the ADSL modem and the PC is correct, run ping test between the PC and the ADSL modem.

On entering the IP address of the modem in the web browser, a window opens up, prompting the user to enter user name and password. Enter a valid user name and password. After this, the home page of the modem opens up. The home page will be as shown below.

Please note that the home page view may be different for different types of modems.

Home Page of modem

The home page gives the current status of the modem, including the status of the ADSL link and the various interfaces in the modem.

Page 4of 11

The first step for configuration would be to configure the IP address of the modem. This can be done by going to the LAN configuration page . In this page, the IP address of the modem can be modified. Make sure that the IP Address of the subscriber modem is different from that of the ISP modem.

Once the IP address is modified, the browser has to be shut down and reopened with the new defined IP address of the modem.

The LAN configuration table will be as shown below:

LAN Configuration page

The next step is to configure the WAN interface of the modem. The WAN configuration page will have options to configure the various WAN protocols and interfaces, supported by the modem.

Page 5of 11

The WAN configuration page will also have an option to view the DSL status.

A sample view of the WAN configuration page is shown below:

WAN configuration

As shown above, the WAN configuration page has options to configure or view the various WAN interfaces like ATM VC, PPP, EOA and IpoA.

Select the ATM VC option to configure the ATM Virtual Channel of the modem. Each modem can have a maximum of 8 Virtual Channels configured. But for all practical purposes, only one Virtual Channel is required to be configured. This is because, the modem is operated in bridge mode and LLC mux mode.

The ATM VC configuration page will be as shown below:

Page 6of 11

ATM VC Configuration

Since only one ATM VC interface is required, only AAL5-0 has to be configured. The rest of the ATM VCs are not required. For AAL5-0, the VPI and VCI has to be defined. These are fixed values – the value of VPI has to be 0 and the value of VCI has to be 35. Make sure these values are configured for AAL5-0, otherwise the data connectivity between the subscriber PC and the ISP will not happen.

Tip: If the VPI/VCI values are not configured properly, the ADSL link will be active but the data transfer will not take place.

After configuring the ATM VC interface, the next step would be to configure the EOA interface. EOA is Ethernet over ATM. This is required for packetizing the Ethernet packets received from the subscriber’s PC to ATM frames and transporting them over the ADSL link.

The EOA configuration page will be as shown below:

Page 7of 11

Adding an EOA interface

For configuration, use eoa-0 interface and select aal5-0 as the lower interface for this eoa interface. Do not enter any IP address or net mask. Also disable the DHCP and default route.

After adding the eoa-0 interface, the screen will be as shown below:

Page 8of 11

After Adding an EOA interface

With this, the WAN interfaces, which will be used by our configuration has been fully configured. The next step would be to configure the modem in the bridging mode, so that it starts to bridge the traffic from the LAN interface to the WAN interface.

For configuring the bridging mode of the ADSL modem, select the bridging page. The display will be as shown below:

Page 9of 11

Configuring for Bridging

In this page, select the eth-0 and eoa-0 as the interfaces, which have to be bridged. Then select the bridging, after which a screen as shown below will be displayed:

Configuring Bridging mode

Page 10of 11

In this option, enable the bridging and WAN to WAN bridging.

After the above configuration, the subscriber PC must start getting ping responses from the ISP modem (which is also configured as the Gateway for the PC). If the ping responses are not received, then check up the ADSL link status and then the configuration parameters of the ADSL modem.

After completing the configuration process, the changes made in the configuration of the modem have to be stored. This is very important, as unless the changes made are committed in the modem, all the parameters will be changed to default modem, when the modem is powered down and switched on again.

For committing the changes made, select the Admin page. A sample of the admin page is shown below:

Commit & Reboot

In this page select the commit button to save all the changes made in the configuration of the modem.

With this, the configuration of the modem is complete and it is ready for accessing the net.

Page 11of 11