Home > Articles > Certification > Cisco Certification > CCNP

This chapter is from the book

Cisco 6160 DSLAM Overview

This section provides an overview of the Cisco 6160 DSLAM system and hardware components and discusses basic Cisco DSLAM configuration.

System and Hardware Components

The Cisco 6160 can be operated as a carrier class DSLAM with ADSL, SDSL, and Integrated Services Digital Network DSL (IDSL) interfaces. The Cisco 6160 is intended for use in North American central office facilities. The Cisco 6160 DSLAM can support up to 256 subscribers and concentrate traffic onto a single high-speed WAN trunk.

Examine Figure 8-2. The chassis has 32 short slots for line cards and two double-length slots for Network Interface (NI-2) cards. Slots 10 and 11 hold the NI-2 cards. Slots 1 to 9 and 12 to 34 hold the line cards. Some of the essential functions the NI-2 card provides are ATM switching, WAN interface, and subtending.

WAN interfaces can be either OC-3c or DS3 and can be used for trunking or subtending. Subtending allows up to 12 other chassis to be subtended to a single host DSLAM system, aggregating the subtended systems through a single network uplink.

DSL line cards come in several varieties. In this chapter, the Quad Flexicard is used. It supports four ADSL connections and can be configured with CAP, DMT2, or G.lite line coding.

Figure 02Figure 8-2 Cisco 6160 DSLAM Chassis

NOTE

You can install line cards of two or more different types in a single Cisco 6160 chassis. However, mixing different types of cards (Flexi ADSL, SDSL, and/or IDSL) on the same side of the chassis might result in decreased performance.

Basic Cisco 6160 DSLAM Configuration

In this section, you will learn all the necessary information to successfully configure the Cisco 6160 DSLAM.

Interface Numbering

Before you begin the configuration, it is important to know the interface numbering scheme used by the Cisco IOS software in the 6160. Interfaces whose names begin with ATM0 (ATM0/0, ATM0/1, and so forth) are NI-2 card WAN interfaces. ATM0/0 is the ATM switch's interface with the processor. There is no need to configure ATM0/0 unless you plan to use in-band management. ATM0/1 is the trunk port. ATM0/2 and ATM0/3, if present, are subtending interfaces.

Table 8-2 illustrates the interface numbering scheme for Cisco 6160 DSLAM.

Table 8-2 Cisco 6160 DSLAM Interface Numbering

Interface

Description

ATM0/0

The ATM switch's interface

ATM0/1

Trunk interface

ATM0/2

Subtend

ATMA/B

A = 1 to 34 (slot); B = 1 to 4 (port)

Ethernet0/0

Management Ethernet port


As shown in Table 8-2, interfaces whose names begin with ATM1 through ATM34 are line card interfaces. Ethernet0/0 is the interface for the LAN that connects the Cisco 6160 to its management system. For line card interfaces, the number before the slash indicates the slot number. The number after the slash indicates the interface or port number. For example, ATM5/4 is port 4 in slot 5.

Configuring Line Cards

Before you can use the Flexicard, you need to configure a slot for a specific card type. Use this command:

slot slot# cardtype

slot# is the slot number; the range is 1 to 34. cardtype is the card type for which you want to configure the slot. You must indicate the type of card. To configure the Quad Flexicard in slot 1 to use DMT modulation, you would enter the following:

lab-6160(config)#slot 1 ATUC-4FLEXIDMT

NOTE

You can use show hardware command to find out which cards are installed in the Cisco 6160 DSLAM.

Creating DSL Profiles

Except for a few dynamic operational modes, port configuration takes place through a configuration profile rather than by direct configuration. A profile is a named list of configuration parameters with a value assigned to each parameter. You can change the value of each parameter in the profile. To configure a subscriber, you need only attach the desired profile to that subscriber. When you change a parameter in a profile, you change the value of that parameter on all ports using that profile. If you want to change a single port or a subset of ports, you can copy the profile, change the desired parameters, and then assign the new profile to the desired ports. Multiple ports can share the same profile, but one port cannot have more than one profile. If you modify an existing profile, that change takes effect on every ADSL port linked to that profile.

Every port is attached to a special profile named "default" by default. You can modify the default profile (but not delete it). This is useful when you want to modify one or two default parameters and apply this to every port in the system (rather than creating a new profile with minor changes and attaching it to every port in the system).

When you create a profile, it inherits all the configuration settings of the default profile at the time of creation. If you subsequently modify the special profile default, the new changes to the default do not propagate to the previously created profiles.

To create a DSL profile, or to select an existing profile for modification, use the following command:

dsl-profile profile-name

To delete a DSL profile, use the following command:

no dsl-profile profile-name

In both examples, profile-name is the name of the profile you want to create, or an existing profile you want to delete or modify. To create a DSL profile called ccnp, you would enter the following:

lab-6160#configure terminal
lab-6160(config)#dsl-profile ccnp

After the DSL profiles are created, you can customize them with the following parameters:

  • Bit rate

  • DMT margin

  • Check bytes

  • Interleaving delay

  • Training mode

The following sections discuss these parameters in more detail.

Setting the Bit Rate

To set the maximum and minimum allowed bit rates for the fast-path and interleaved-path profile parameters, use the following command:

dmt bitrate max interleaved downstream dmt-bitrate upstream dmt-bitrate

dmt-bitrate is a multiple of 32 kbps. If you enter a nonmultiple of 32 kbps, the Cisco IOS software aborts the command.

In Example 8-1, the command sets the maximum interleaved-path bit rate of the ccnp profile to 8032 kbps downstream and 832 kbps upstream.

Example 8-1 Setting the Bit Rate

lab-6160#configure terminal
lab-6160(config)#dsl-profile ccnp
lab-6160(config-dsl-prof)#dmt bitrate interleaved-path downstream 8032
 upstream 832

Setting the Margins

To set upstream and downstream signal-to-noise ratio (SNR) DMT margins, use the following command:

dmt margin downstream dmt-margin upstream dmt-margin

dmt-margin is equal to the upstream and downstream SNR margins in decibels. Values must be nonnegative integers. The range is from 0 to 127 dB.

NOTE

Research has shown that the optimum margins for DMT service are 6 dB downstream and 6 dB upstream.

In Example 8-2, the command sets the DMT SNR margins of the ccnp profile to 6 dB upstream and 3 dB downstream.

Example 8-2 Setting the Margin

lab-6160#configure terminal
lab-6160(config)#dsl-profile ccnp
lab-6160(config-dsl-prof)#dmt margin downstream 3 upstream 6

Setting Check Bytes

Check bytes are also called FEC bytes. They are added to the user data stream to improve error correction, but they slow performance. To set upstream and downstream check bytes, use the following command:

dmt check-bytes interleaved downstream bytes upstream bytes

bytes values can be 0, 2, 4, 6, 8, 10, 12, 14, and 16. The default is 16 in each direction.

In Example 8-3, the command sets the interleaved check bytes for the ccnp profile to 6 upstream and 12 downstream.

Example 8-3 Setting the Check Bytes

lab-6160#configure terminal
lab-6160(config)#dsl-profile ccnp
lab-6160(config-dsl-prof)#dmt check-bytes interleaved
downstream 12 upstream 6

Setting Interleaving Delay

To set the interleaving delay parameter, use this command:

dmt interleaving-delay downstream delay-in-_secs upstream delay-in-_secs

delay-in-μsecs specifies the interleaving delay in microseconds. The default value is 16000 microseconds in each direction. Allowable values are 0, 500, 1000, 2000, 4000, 8000, and 16000 microseconds.

In Example 8-4, the command sets the interleaving delay of the ccnp profile to 2000 microseconds downstream and 4000 microseconds upstream.

Example 8-4 Setting the Interleaving Delay

lab-6160#configure terminal
lab-6160(config)#dsl-profile ccnp
lab-6160(config-dsl-prof)#dmt interleaving-delay downstream 2000 upstream 4000

Setting the Training Mode

Two training modes are available—standard and quick. Standard train relates to a training procedure specified in ANSI standards document T1.413, which is considered the standards reference for DMT ADSL. Quick train, also called fast train, uses a vendor-specific training sequence that is shorter than the standard training sequence.

To modify the training mode in a DMT profile, use the following command:

dmt training-mode {standard / quick}

In Example 8-5, the command sets the ccnp profile's training mode to quick.

Example 8-5 Setting the Training Mode

lab-6160#configure terminal
lab-6160(config)#dsl-profile ccnp
lab-6160(config-dsl-prof)#dmt training-mode quick

InformIT Promotional Mailings & Special Offers

I would like to receive exclusive offers and hear about products from InformIT and its family of brands. I can unsubscribe at any time.

Overview


Pearson Education, Inc., 221 River Street, Hoboken, New Jersey 07030, (Pearson) presents this site to provide information about products and services that can be purchased through this site.

This privacy notice provides an overview of our commitment to privacy and describes how we collect, protect, use and share personal information collected through this site. Please note that other Pearson websites and online products and services have their own separate privacy policies.

Collection and Use of Information


To conduct business and deliver products and services, Pearson collects and uses personal information in several ways in connection with this site, including:

Questions and Inquiries

For inquiries and questions, we collect the inquiry or question, together with name, contact details (email address, phone number and mailing address) and any other additional information voluntarily submitted to us through a Contact Us form or an email. We use this information to address the inquiry and respond to the question.

Online Store

For orders and purchases placed through our online store on this site, we collect order details, name, institution name and address (if applicable), email address, phone number, shipping and billing addresses, credit/debit card information, shipping options and any instructions. We use this information to complete transactions, fulfill orders, communicate with individuals placing orders or visiting the online store, and for related purposes.

Surveys

Pearson may offer opportunities to provide feedback or participate in surveys, including surveys evaluating Pearson products, services or sites. Participation is voluntary. Pearson collects information requested in the survey questions and uses the information to evaluate, support, maintain and improve products, services or sites, develop new products and services, conduct educational research and for other purposes specified in the survey.

Contests and Drawings

Occasionally, we may sponsor a contest or drawing. Participation is optional. Pearson collects name, contact information and other information specified on the entry form for the contest or drawing to conduct the contest or drawing. Pearson may collect additional personal information from the winners of a contest or drawing in order to award the prize and for tax reporting purposes, as required by law.

Newsletters

If you have elected to receive email newsletters or promotional mailings and special offers but want to unsubscribe, simply email information@informit.com.

Service Announcements

On rare occasions it is necessary to send out a strictly service related announcement. For instance, if our service is temporarily suspended for maintenance we might send users an email. Generally, users may not opt-out of these communications, though they can deactivate their account information. However, these communications are not promotional in nature.

Customer Service

We communicate with users on a regular basis to provide requested services and in regard to issues relating to their account we reply via email or phone in accordance with the users' wishes when a user submits their information through our Contact Us form.

Other Collection and Use of Information


Application and System Logs

Pearson automatically collects log data to help ensure the delivery, availability and security of this site. Log data may include technical information about how a user or visitor connected to this site, such as browser type, type of computer/device, operating system, internet service provider and IP address. We use this information for support purposes and to monitor the health of the site, identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents and appropriately scale computing resources.

Web Analytics

Pearson may use third party web trend analytical services, including Google Analytics, to collect visitor information, such as IP addresses, browser types, referring pages, pages visited and time spent on a particular site. While these analytical services collect and report information on an anonymous basis, they may use cookies to gather web trend information. The information gathered may enable Pearson (but not the third party web trend services) to link information with application and system log data. Pearson uses this information for system administration and to identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents, appropriately scale computing resources and otherwise support and deliver this site and its services.

Cookies and Related Technologies

This site uses cookies and similar technologies to personalize content, measure traffic patterns, control security, track use and access of information on this site, and provide interest-based messages and advertising. Users can manage and block the use of cookies through their browser. Disabling or blocking certain cookies may limit the functionality of this site.

Do Not Track

This site currently does not respond to Do Not Track signals.

Security


Pearson uses appropriate physical, administrative and technical security measures to protect personal information from unauthorized access, use and disclosure.

Children


This site is not directed to children under the age of 13.

Marketing


Pearson may send or direct marketing communications to users, provided that

  • Pearson will not use personal information collected or processed as a K-12 school service provider for the purpose of directed or targeted advertising.
  • Such marketing is consistent with applicable law and Pearson's legal obligations.
  • Pearson will not knowingly direct or send marketing communications to an individual who has expressed a preference not to receive marketing.
  • Where required by applicable law, express or implied consent to marketing exists and has not been withdrawn.

Pearson may provide personal information to a third party service provider on a restricted basis to provide marketing solely on behalf of Pearson or an affiliate or customer for whom Pearson is a service provider. Marketing preferences may be changed at any time.

Correcting/Updating Personal Information


If a user's personally identifiable information changes (such as your postal address or email address), we provide a way to correct or update that user's personal data provided to us. This can be done on the Account page. If a user no longer desires our service and desires to delete his or her account, please contact us at customer-service@informit.com and we will process the deletion of a user's account.

Choice/Opt-out


Users can always make an informed choice as to whether they should proceed with certain services offered by InformIT. If you choose to remove yourself from our mailing list(s) simply visit the following page and uncheck any communication you no longer want to receive: www.informit.com/u.aspx.

Sale of Personal Information


Pearson does not rent or sell personal information in exchange for any payment of money.

While Pearson does not sell personal information, as defined in Nevada law, Nevada residents may email a request for no sale of their personal information to NevadaDesignatedRequest@pearson.com.

Supplemental Privacy Statement for California Residents


California residents should read our Supplemental privacy statement for California residents in conjunction with this Privacy Notice. The Supplemental privacy statement for California residents explains Pearson's commitment to comply with California law and applies to personal information of California residents collected in connection with this site and the Services.

Sharing and Disclosure


Pearson may disclose personal information, as follows:

  • As required by law.
  • With the consent of the individual (or their parent, if the individual is a minor)
  • In response to a subpoena, court order or legal process, to the extent permitted or required by law
  • To protect the security and safety of individuals, data, assets and systems, consistent with applicable law
  • In connection the sale, joint venture or other transfer of some or all of its company or assets, subject to the provisions of this Privacy Notice
  • To investigate or address actual or suspected fraud or other illegal activities
  • To exercise its legal rights, including enforcement of the Terms of Use for this site or another contract
  • To affiliated Pearson companies and other companies and organizations who perform work for Pearson and are obligated to protect the privacy of personal information consistent with this Privacy Notice
  • To a school, organization, company or government agency, where Pearson collects or processes the personal information in a school setting or on behalf of such organization, company or government agency.

Links


This web site contains links to other sites. Please be aware that we are not responsible for the privacy practices of such other sites. We encourage our users to be aware when they leave our site and to read the privacy statements of each and every web site that collects Personal Information. This privacy statement applies solely to information collected by this web site.

Requests and Contact


Please contact us about this Privacy Notice or if you have any requests or questions relating to the privacy of your personal information.

Changes to this Privacy Notice


We may revise this Privacy Notice through an updated posting. We will identify the effective date of the revision in the posting. Often, updates are made to provide greater clarity or to comply with changes in regulatory requirements. If the updates involve material changes to the collection, protection, use or disclosure of Personal Information, Pearson will provide notice of the change through a conspicuous notice on this site or other appropriate way. Continued use of the site after the effective date of a posted revision evidences acceptance. Please contact us if you have questions or concerns about the Privacy Notice or any objection to any revisions.

Last Update: November 17, 2020