Lucent Stinger User Manual

Stinger

®

ADSL 24-Port Line Interface Module (LIM) Guide

For software version 9.2-167

December 2001

Copyright © 2000, 2001 Lucent Technologies Inc. All rights reserved.

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Hereby, Lucent Technologies, declares that the equipment documented in this publication is in compliance with the essential requirements and other
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Stinger® ADSL 24-Port LIM Guide iii

Contents

Customer Service..................................................................................................................... iii

About This Guide.............................................................................. xi

What is in this guide.................................................................................................................. xi

What you should know ............................................................................................................. xi

Documentation conventions...................................................................................................... xi

Stinger documentation set .......................................................................................................xii

Chapter 1 Configuring an ADSL 24-Port Line Interface Module (LIM)......... 1-1

Installing an ADSL 24-port LIM .......................................................................................... 1-1

Module specifications............................................................................................................ 1-2

Status indicators..................................................................................................................... 1-2

Interpreting ADSL 24-port LIM status lights................................................................. 1-4

Configuring ATM ADSL-DMT interfaces............................................................................ 1-4

Overview of the AL-DMT profile parameters................................................................ 1-5

ADSL protocol support................................................................................................... 1-5

Line activation and DMT parameters............................................................................. 1-6

Rate-adaptive mode parameters...................................................................................... 1-8

Power-level parameters and Power Spectral Density (PSD).......................................... 1-9

Fast and interleaved bit-rate parameters.............................. ..... ...... .............................. 1-10

Interleaving delay parameters ....................................................................................... 1-12

Noise margin parameters.............................................................................................. 1-12

Dynamic rate-adaptive noise margin parameters.......................................................... 1-14

Configuring call-control....................................................................................................... 1-15

Modifying call control to support dual latency.................................................................... 1-17

Provisioning a dual latency deployment................................... .................................... 1-17

Examples of ADSL-DMT interface configuration ...................................................... ...... .. 1-21

Checking status of ADSL-DMT interface........................................................................... 1-22

Checking status of the physical interface ..................................................................... 1-23

Displaying ADSL-DMT port status and nailed groups ................................................ 1-25

Obtaining statistics about operations............................................................................ 1-25

Chapter 2 Configuring LIM and LIM Port Redundancy................................. 2-1

Overview of LIM and LIM port redundancy......................................................................... 2-1

Configuring LIM redundancy................................................................................................ 2-1

Overview of the LIM-Sparing-Config profile ................................................................ 2-2

Manual LIM redundancy................................................................................................ 2-4

Automatic LIM redundancy............................................................................................ 2-4

LIM redundancy with IRMs and LPM-Rs...................................................................... 2-7

Checking LIM redundancy status................................................................................... 2-8

Checking status with the Rearslot command................................................... ..... .......... 2-9

Stinger® ADSL 24-Port LIM Guide v

Contents

Configuring LIM port redundancy........................................ ....................................... ........ 2-10

Enabling LIM port redundancy..................................................................................... 2-11

Manual LIM port redundancy....................................................................................... 2-12

Automatic LIM port redundancy.................................................................................. 2-12

Checking the status of extended LIM port redundancy................................................ 2-13

vi Stinger® ADSL 24-Port LIM Guide

Figures

Figure 1-1 ADSL 24-port LIM....................................................................................... 1-3

Figure 1-2 Relationship between noise margin parameters and power adjustments.... 1-12

Figure 1-3 Future support: Noise margin s and dynamic rate adaptation relationship . 1-14

Figure 1-4 ADSL ATM LIM configuration................................................................. 1-21

Figure 2-1 LIM redundancy in a Stinger FS unit........................................................... 2-2

Figure 2-2 LIM port redundancy on a Stinger FS unit................................................. 2-11

Stinger® ADSL 24-Port LIM Guide vii

Tables

Table 1-1 ADSL 24-port LIM specifications................................................................ 1-2

Table 1-2 ADSL 24-port LIM status lights................................................................... 1-4

Stinger® ADSL 24-Port LIM Guide ix

About This Guide

What is in this guide

This guide describes how to configure and monitor the Stinger ADSL 24-port line interface
module (LIM) and includes configuration ex amples and module sp ecifications. This guide also
describes how to configure LIM r edundancy.

!

Warning: Before installing your Stinger unit, be sure to read the safety instructions in the

Edge Access Safety and Compliance Guide. For information specific to your unit, see the
“Safety-Related Physical, Environmental, and Electrical Information” appendix in the Getting
Started Gui de for your Stinger unit.

What you should know

To make use of the procedures and sample configurations in this guide, you should have a
general knowledge of Stinger products and a working knowledge of the command-line
interface. You should understand the fundamental concepts of digital subscriber line (DSL)
technology and be familiar with the relationship between DSL interfaces and associated
configuration profiles.

Documentation conventions

Following are the special characters and typographical conventions that might be used in this
manual:

Convention Meaning

Monospace text Represents text that appears on your computer’s screen, or that could

appear on your computer’s screen.

Boldface mono­space text

Italics Represent variable information. Do not enter the words themselves in

Represents characters that you enter exactly as shown (unless the char­acters are also in italics—see Italics, below). If you could enter
the characters but are not specifically instructed to, they do not appear
in boldface.

the command. Enter the information they represent. In ordinary text,
italics are used for titles of publications, for some terms that would
otherwise be in quotation marks, and to show emphasis.

Stinger® ADSL 24-Port LIM Guide xi

About This Guide

Stinger documentation set

Convention Meaning

[ ] Square brackets indicate an optional argument you might add to a

| Separates command choices that are mutually exclusive.
> Points to the next level in the path to a parameter or menu item. The

Key1-Key2 Represents a combination keystroke. To enter a combination key-

Press Enter Means press the Enter, or Return, key or its equivalent on your com-

Note:

command. To include such an argument, type only the information
inside the brackets. Do not type the brackets unless they appear in
boldface.

item that follows the angle bracket is one of the options that appear
when you select the item that precedes the angle bracket.

stroke, press the first key and hold it down while you press one or
more other keys. Release all the keys at the same time. (For example,
Ctrl-H means hold down the Control key and press the H key.)

puter.
Introduces important additional information.

!

Caution:

!

Warning:

Warning:

W arns that a failure to follow the recom mended procedur e could result
in loss of data or damage to equipment.

Warns that a failure to take appropriate safety precautions could resu lt
in physical injury.

Warns of danger of electric shock.

Stinger documentation set

The Stinger documentation set consists of the following manuals, which can be found at

http://www.lucentdocs.com/ins:

• Read me first:

– Edge Access Safety and Compliance Guide. Contains important safety instructions

and country-specific information that you must read before installing a Stinger unit.

– TAOS Command-Line Interface Guide. Introduces the TAOS command-line

environment and shows you how to use the command-line interface effectively. This
guide describes keyboard shortcuts and introduces commands, security levels, profile
structure, and parameter types.

• Installation and basic configuration:

– Getting Started Guide for your unit. Shows how to install your Stinger chassis and

hardware. This guide also shows you how to use the command-line interface to
configure and verify IP access and basic access security on the unit, and how to
configure Stinger control module redundancy.

xii Stinger® ADSL 24-Port LIM Guide

About This Guide

Stinger documentation set

– Module guides. For each Stinger line interface module (LIM), trunk mod ule, or o ther

type of module, an individual guide describes the module's features and provides
instructions for configuring the module and verifying it s status.

• Configuration:

– Stinger ATM Configuration Guide. Describes how to use the command-line interface

to configure Asynchronous Transfer Mode (ATM) operations on a Stinger unit. The
guide explains how to configure permanent virtual circuits (PVCs), and shows how to
use standard ATM features such as quality of ser v ice (QoS), connection admission
control (CAC), and subtending.

– Stinger Private Network-to-Network Interface (PNNI) Supplement. Provides

quick-start instructions for configuring PNNI and soft PVCs (SPVCs), and describes
the related profiles and commands in the Stinger command-line interface.

– Stinger SNMP Management of the ATM Stack Supplement. Describes SNMP

management of ATM ports, interfaces, and connections on a Stinger unit to provide
guidelines for configuring and managing ATM circuits through any SNMP
management utility.

– Stinger T1000 Module Routing and Tunneling Supplement. Describes how to

configure the Layer 3 routing and virtual private network (VPN) capabilities
supported by a Stinger T1000 module.

– T AOS R ADIUS Guide and Refer en ce. De scr ibes how to s et up a TAOS unit to use the

Remote Authentication Dial-In User Service (RADIUS) server and contains a
complete reference to RADIUS attributes.

• Administration and troubleshooting:

– Stinger Administration Guide. Describes how to administer th e Stin ger unit an d

manage its operations. Each chapter focuses on a particular aspect of Stinger
administration and operations. The chapters describe tools for system management,
network management, and Simple Network Management Protocol (SNMP)
management.

• Reference:

– Stinger Reference. An alphabetic reference to Stinger profiles, parameters, and

commands.

– T AOS Glossary. Defines terms used in documentation for St inge r units.

Stinger® ADSL 24-Port LIM Guide xiii

Configuring an ADSL 24-Port Line Interface Module (LIM)

Installing an ADSL 24-port LIM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Module specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Status indicators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Configuring ATM ADSL-DMT interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Configuring call-control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15

Modifying call control to support dual latency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17

Examples of ADSL-DMT interface configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21

Checking status of ADSL-DMT interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22

The Stinger asymmetric digital subscriber line (ADSL) 24-port line interface module (LIM)
provides 24 ADSL interfaces that support h igh-speed asymm etric da ta transfer us ing the ANSI
discrete multitone (DMT), G.lite, and G.dmt ADSL protocols.

One version of the ADSL 24-port LIM, product code STGR-LIM-AD-24, supports the Stinger
FS and Stinger LS chassis.

1

Installing an ADSL 24-port LIM

Install the ADSL 24-port LIM in the same manner as other LIMs. See the Stinger Getting
Started Gui de for details. After installation, the module must be conf igured following the

instructions in this guide.

Stinger® ADSL 24-Port LIM Guide 1-1

Configuring an ADSL 24-Port Line Interface Module (LIM)

Module specifications

Module specifications

Table 1-1 lists specifications for the ADSL 24-port LIM.

Table 1-1. ADSL 24-port LIM specifications

Category Specification

Physical dimen­sions

Power requirements
T emp erature rang e FS/LT version: 32°F to 131°F (0°C to 55°C)

Interface standards ANSI T1E1.4/99-006 (draft).
Network Timing

Reference (NTR)
Physical connectors USOC RJ21X 50-pin telco connector. Must meet JIS C5973 stan-

Status indicators

Several status lights on the front panel of the ADSL 24-port LIM indicate the status of the
module and its ports. Figure 1-1 shows the front panel and status lights of the ADSL 24 -port
LIM.

Height: 15 inches (38.1cm).
Width: 1.06 inches (2.69cm).
Depth: 8 in ches (20.3cm).
Weight: 1.5 pounds (0.68kg).

106.56 W.

RT version: -40°F to 149°F (-40°C to 65°C)

An 8kHz reference clock is provided over the ADSL line for any
CPE with the capability to recover it.

dards.

1-2 Stinger® ADSL 24-Port LIM Guide

Configuring an ADSL 24-Port Line Interface Module (LIM)

Figure 1-1. ADSL 24-port LIM

Status indicators

Stinger® ADSL 24-Port LIM Guide 1-3

Configuring an ADSL 24-Port Line Interface Module (LIM)

Configuring ATM ADSL-DMT interfaces

Interpreting ADSL 24-port LIM status lights

All status lights illuminate briefly upon startup or rest art, then rema in dark until the module
passes its power-on self test (POST). When the module passes the POST and becomes
operational, the ACTIVE light illuminates. It is the only light that is on during normal
operation.

Table 1-2 explains the ADSL 24-port LIM status lights.

Table 1-2. ADSL 24-port LIM status lights

Light Color Indication

STBY Orange The module is a designated spare. The control module

switches traffic to the module if one of the other
modules fails.

ACTIVE Green The module or port is fully operational and no errors

have been detected.
FAULT Orange The module failed to pass its POST.
BYPASS Orange The module is in bypass mode. (The module

redundancy feature is activated.)
PORT Green The local and remote ends of the physical line have

achieved frame synchronization, and the local end of

the ATM link has achieved cell delineation.

If the light is not illuminated, the port is inactive.

Configuring ATM ADSL-DMT interfaces

A Stinger unit creates an AL-DMT profile for each ADSL-DMT interface in the system. For
example, for an ASL-DMT LIM installed in slot 14, the system creates the following profiles:

admin> dir al-dmt
28 06/20/1999 00:27:37 { shelf-1 slot-14 1 } 1:14:1
28 06/20/1999 00:27:37 { shelf-1 slot-14 2 } 1:14:2
28 06/20/1999 00:27:37 { shelf-1 slot-14 3 } 1:14:3
28 06/20/1999 00:27:37 { shelf-1 slot-14 4 } 1:14:4
28 06/20/1999 00:27:37 { shelf-1 slot-14 5 } 1:14:5
28 06/20/1999 00:27:37 { shelf-1 slot-14 6 } 1:14:6
28 06/20/1999 00:27:37 { shelf-1 slot-14 7 } 1:14:7
28 06/20/1999 00:27:37 { shelf-1 slot-14 8 } 1:14:8
28 06/20/1999 00:27:37 { shelf-1 slot-14 9 } 1:14:9
29 06/20/1999 00:27:37 { shelf-1 slot-14 10 } 1:14:10
29 06/20/1999 00:27:37 { shelf-1 slot-14 11 } 1:14:11

....

1-4 Stinger® ADSL 24-Port LIM Guide

Configuring an ADSL 24-Port Line Interface Module (LIM)

Overview of the AL-DMT profile parameters

Various discrete multitone (DMT) standards define the fast and interleave data latencies for
each direction (upstream and downstream) of ADSL transmission. In the Stinger AL-DMT
profiles, you set parameters to specify the data rate, signal quality and power, and data delay of
the interface. The Stinger unit references these parameters in the training process.

The following sets of parameters are active in the current software version:

• Line activation and DMT parameters

• Rate adaptive mode parameters

• Power spectral density (PSD) and power-level parameters

• Fast and interleaved bit-rate parameters

• Interleaving delay parameters

• Noise margin parameters

• Dynamic rate adaptive parameters

• Trellis encoding

• Automatic Gain Control

Configuring ATM ADSL-DMT interfaces

The following AL-DMT features are not currently supported, but will be soon:

• Mixed latency

• Dynamic rate adaptation

These features are not present in the current software version. However, the parameters related
to these features are present in the AL-DMT profile.

ADSL protocol support

The ADSL 24-port LIM supports the following protocols:

• ANSI DMT—ANSI T1.413.2

• G.dmt—ITU 992.1

• G.lite—ITU 992.2, ITU 994.1

By setting the line-code
auto-select, the LIM automatically detects and configures itself with the correct ADSL

protocol. This is the optimum setting for the ADSL 24-port LIM.
No matter which protocol is used, in general, the AL-DMT profile parameters remain the same

and are configured in the same way. Exceptions are the line-latency-down and
line-latency-up parameters. When the G.lite protocol is specified or detected, these
parameters are automatically set to the value interleave.

parameter in the al-dmt : line-config profile to

Stinger® ADSL 24-Port LIM Guide 1-5

Configuring an ADSL 24-Port Line Interface Module (LIM)

Configuring ATM ADSL-DMT interfaces

Line activation and DMT parameters

Each direction of traffic (upstream and downstream) on an ADSL-DMT line can have a
different minimum and maximum bit rate. The ADSL 24-port LIM supports dual latency,
which can use both the fast and interleaved channels in both directions, but does not support
mixed latency, which can use a different channel in each direction.

The AL-DMT profile and its Line-Config subprofile contain the following parameters, shown
with default values, for activating and setting up the AL-DMT line. Most of these profile
parameters are described in the following table. The Rate-Adaptive mode and power
parameters are described separately.

[in AL-DMT/{ any-shelf any-slot 0 }]
name = ""
physical-address* = { any-shelf any-slot 0 }
enabled = no
sparing-mode = inactive

[in AL-DMT/{ any-shelf any-slot 0 }:line-config]
trunk-group = 0
nailed-group = 1
vp-switching-vpi = 15
activation = static
call-route-info = { any-shelf any-slot 0 }
rate-adapt-mode-up = automatic-at-startup
rate-adapt-mode-down = automatic-at-startup
rate-adapt-ratio-up = 100
rate-adapt-ratio-down = 100
max-aggr-power-level-up = 13
max-aggr-power-level-down = 20
max-power-spectral-density = 40
line-code = auto-select
line-latency-down = fast
line-latency-up = fast
trellis-encoding = yes
upstream-start-bin = 6
upstream-end-bin = 31
downstream-start-bin = 32
downstream-end-bin = 255

Parameter Specifies

Name Name of the interface. The default value is the interface address in

:slot:port format (for examp l e, 1:2:3), b ut you can assign

shelf

a text string of up to 16 characters.
Physical-Address Physical address of the interface in the Stinger unit.
Enabled Enables the ADSL-DMT interface. An ADSL-DMT line is

disabled until you activate the line in the AL-DMT profile.

1-6 Stinger® ADSL 24-Port LIM Guide

Configuring an ADSL 24-Port Line Interface Module (LIM)

Configuring ATM ADSL-DMT interfaces

Parameter Specifies

Sparing-mode Enables or disables port redundancy (sparing) and specifies the

mode.

The default value,

inactive, disables LIM port redundancy

(sparing).

The

automatic setting activates automatic sparing for the port.

The values of the error threshold parameters specified in the

auto-lim-sparing-config:lim-sparing-config

[slot number]profile are used.

manual setting deactivates the LIM port and reestablishes

The

the connection on the same port of the spare LIM.
Trunk-Group Not currently used. Leave the default value (zero).
Nailed-Group Nailed-group number for the ADSL-DMT physical interface. A

Connection or RADIUS profile uses this number to specify the

interface.

Because each interface is assigned a unique default number, you

do not need to modify the value of this parameter. If you assign a

new value, it must be a number from 1 through 1024 that is unique

within the system.
VP-Switching-VPI The virtual path identifier (VPI) to use for virtual path (VP)

switching on the LIM port. The default is 15. All other VPIs are

used for virtual channel (VC) switching.
Activation Not currently used. Leave the default value (static).
Call-Route-Info Not currently used. Leave the default value (the zero address).
Line-Code The DMT line code to be used for training. Valid values are

auto-select

, ansi-dmt, g.lite, and g.dmt. The

default value is auto-select which enables automatic

detection of the ADSL line coding.
Line-Latency-Down Latency path (

fast or interleave) to be used for

downstream data transport. Default value is interleave for

G.lite and fast for all other line code.

For related settings, see “Fast and interleaved bit-rate parameters”

on page 1-10.
Line-Latency-Up Latency path (fast or interleave) to be used for upstream

data transport. Default value is

interleave for G.lite and fast

for all other line code.

For related settings, see “Fast and interleaved bit-rate parameters”

on page 1-10.
Trellis-Encoding Enable or disable trellis encoding. Trellis encoding is specified in

the DMT standard. Disabling this parameter (no) can increase

performance, but at the cost of becoming noncompliant with the

standard. The default is yes.

Stinger® ADSL 24-Port LIM Guide 1-7

Configuring an ADSL 24-Port Line Interface Module (LIM)

Configuring ATM ADSL-DMT interfaces

Parameter Specifies

Upstream-Start-Bin Starting frequency bin for upstream transmission. Valid range is 0

through 31 for the 24-port LIM. The default value is 6.
Upstream-End-Bin Ending frequency bin for upstream transmission. Valid range is 0

through 31 for the 24-port LIM. The default value is 31.
Downstream-Start-Bin Starting frequency bin for downstream transmission. Valid range

is 32 through 255 for the 24-port LIM. The default value is 32.
Downstream-End-Bin Ending frequency bin for downstr eam transmission. Valid range is

32 through 255 for the 24-port LIM. The default value is 255.

The upstream and downstream start and end b ins defin e the frequen cy ranges for u pstream an d
downstream data. The frequency f or a part icular bi n is defi ned as the b in number multiplied by

4.3125kHz. Yo u must also make sure to ad just the Max-Bitrate and Min-Bitrate
parameters to match the frequency range defined by the start and end bin numbers.

You can use the bitrate parameters to adjust the frequency content of the ADSL signals. For
example, splitterless ANSI DMT can be supported by appropriate adjustment of the frequency
range. This eliminates the need for splitters or filters at the subscriber location.

Rate-adaptive mode parameters

The Rate-Adapt-Mode-Up and Rate-Adapt-Mode-Down parameters specify rate-adaptive
operations from the subscriber (upstream) or to the subscriber (downstream). Dynamic rate
adaptation is not currently supported, so you must choose between th e values

automatic-at-startup (the default) and operator-controlled.

Automatic-at-startup rate adaptation means that the rate is selected during the training (startup)
process. The line initializes at a minimum specified bit rate and target noise margin. If the line
fails to achieve the minimum bit rate in either direction, it cannot start, and it sends a message
that the requested bit rate was too high. If the line can support a bit rate that is higher than the
minimum and not higher than the maximum bit rate, it can train up to a higher rate within the
acceptable noise margin. Each direction can have a different minimum and maximum bit rate
and use the fast or interleaved ADSL channel. Dual latency can use both the fast and
interleaved channels in both directions. (Mixed latency, which can use a different channel in
each direction, is not currently supported.)

Operator-controlled rate adaptation means that the line must start at and maintain a specific
planned bit rate with an acceptable target noise margin. If the line fails to achieve the planned
bit rate in either direction, it fails to start, and reports that the requested bit rate was too high.
The line does not use a higher bit rate, even if it can support one.

For details about specifying bit rates, see “Fast and interleaved bit-rate parameters” on
page 1-10. For information about defining acceptable noise margins, see “Noise margin
parameters” on page 1-12.

1-8 Stinger® ADSL 24-Port LIM Guide

Configuring an ADSL 24-Port Line Interface Module (LIM)

Configuring ATM ADSL-DMT interfaces

The Al-Dmt Line-Config subprofile contains the following parameters, shown with default
values, defining how rate adaptation will operate on the line:

[in AL-DMT/{ any-shelf any-slot 0 }:line-config]
rate-adapt-mode-up = automatic-at-startup
rate-adapt-mode-down = automatic-at-startup
rate-adapt-ratio-up = 100
rate-adapt-ratio-down = 100

Parameter Specifies

Rate-Adapt-Mode-Up Rate-adaptive mode for upstream training. The default is

automatic-at-startup. With the setting operator­controlled

bit rate. The

the line trains upstream using a constant planned

dynamic setting is not currently supported.

Rate-Adapt-Mode-Down Rate-adaptive mode for downstream training. The default is

automatic-at-startup. With the setting operator­controlled

planned bit rate. The

, the line trains downstream using a constant

dynamic setting is not currently supported.

Rate-Adapt-Ratio-Up Not supported in th is release. Ratio for distributing excess

upstream bit rate among the fast and interleaved channels when
dual latency is supported.

Rate-Adapt-Ratio-Down Not supp orted in this release. Ratio for distributing excess

downstream bit rate among the fas t and in terleaved channels when
dual latency is supported.

Power-level parame ters and Power Spectral Density (PSD)

Maximum aggregate power level is the maximum output power allowed on the line at the
transmitter output. This value is expressed in decibels with reference to one milliwatt ( dBm ),
where zero dBm equals 1 milliwatt. It is defined for both directions. If you lower the default
value, the line consumes less power and has less capacity. The default value is the maximum
allowed setting.

Power spectral density (PSD) is the power of a signal per unit of fr equency, the dimensions are
those of a power divided by Hertz. In the Al-Dmt line configuration subprofile, the
max-power-spectral-density parameter specifies the PSD allowed on the line at the
transmitter output, expressed in dBm/Hz. It is defined for the downstream direction only, with
a valid range of -34 through -52 in even-number increments. If you lower the value from its
default value of -40, the line consumes less power but also has a lower capacity . Increasing the
value can boost the PSD to achieve a higher capacity.

Stinger® ADSL 24-Port LIM Guide 1-9

Configuring an ADSL 24-Port Line Interface Module (LIM)

Configuring ATM ADSL-DMT interfaces

Following are the Al-Dmt line configuration subprofile parameters, shown with default values,
for configuring power:

[in AL-DMT/{ any-shelf any-slot 0 }:line-config]
max-aggr-power-level-up = 13
max-aggr-power-level-down = 20
max-power-spectral-density = 40
gain-default = 16-db

Parameter Specifies

Max-Aggr-Power-Level-Up Maximum aggregate power level on the upstream channel.

Valid range is from 0dBm through 13dBm .

Max-Aggr-Power-Level-Down Maximum aggregate power level on the downstream

channel. Its valid range is from 0dBm through 20dBm.

Max-Power-Spectral-Density Maximum PSD in both directions. Its valid range is from 34

through 52 in even-number increments . If you specif y an odd
number, the system uses the even-number setting below that
number. The actual value used is the negative value of the
number that is specified.

Gain-Default The default gain value in dB (16dB or 20dB) for automatic

gain control (AGC). The optimum value for downstream
transmission is 20dB. The optimum value for upstream
transmission is 16dB.

Fast and interleaved bit-rate parameters

Bit-rate parameters specify minimum, maximum, and planned upstream and downstream bit
rates for a rate-adaptive connection. Bit rates depend on the physical interface (the line to
which the central office equipment (COE) and customer premises equipment (CPE) are
connected) and the ADSL interleaved or fast channel.

The Line-Latency-Up and Line-Latency-Down settings (fast or interleave) determine
which channel is used in each direction. For more information, see “Line activation and DMT
parameters” on page 1-6.

The following sample configuration of the Fast-Path-Config subprofile, bit-r ate para m e ter
settings indicate use of the fast channel for both upstream and downstream traffic. This is the
default. Note that in the current software version, both upstream and downstream traffic must
use the same channel.

[in AL-DMT/{ any-shelf any-slot 0 }:fast-path-config]
min-bitrate-up = 128
min-bitrate-down = 128
max-bitrate-up = 1000
max-bitrate-down = 8000
planned-bitrate-up = 512
planned-bitrate-down = 1000

1-10 Stinger® ADSL 24-Port LIM Guide

Configuring an ADSL 24-Port Line Interface Module (LIM)

Configuring ATM ADSL-DMT interfaces

The following sample configuration of the Interleave-Path-Config subprofile, bit-rate
parameter settings indicate the use of the interleave path channel for both upstream and
downstream traffic.

[in AL-DMT/{ any-shelf any-slot 0 }:interleave-path-config]
min-bitrate-up = 128
min-bitrate-down = 128
max-bitrate-up = 1000
max-bitrate-down = 8000
planned-bitrate-up = 512
planned-bitrate-down = 1000

Parameter Specifies

Min-Bitrate-Up Minimum bit rate for upstream traffic, from 0Kbps through

1024Kbps. When the automatic rate-adaptive mode is in use, the
line initializes at this upstream rate or fails to initialize.

The default value for the ADSL 24-port LIM is 128Kbps.
Note: Not configured for operator-controlled rate adaptation.

Min-Bitrate-Down Minimum bit rate for downstream traffic, from 0Kbps through

8192Kbps. When the automatic rate-adaptive mode is in use, the
line either initializes at this downstream rate or fails to initialize.

The default value for the ADSL 24-port LIM is 128Kbps.
Note: Not configured for operator-controlled rate adaptation.

Max-Bitrate-Up Maximum bit rate for upstream traffic, from 0Kbps through

2,000Kbps.
The default value for the ADSL 24-port LIM is 1000Kbps.

Note: Not configured for operator-controlled rate adaptation.

Max-Bitrate-Down Maximum bit rate for downstream traffic, from 0Kbps through

15,000Kbps.
The default value for the ADSL 24-port LIM is 8000Kbps.

Note: Not configured for operator-controlled rate adaptation.

Planned-Bitrate-Up Constant bit rate for upstream traffic when operator-controlled

rate-adaptive mode is in use. Valid values are from 0Kbps through
2,000Kbps.

The default value for the ADSL 24-port LIM is 512Kbps.
Note: Not configured for automatic-at-startup rate adaptation.

Planned-Bitrate-Down Constant bit rate for downstream traffic when operator-controlled

rate-adaptive mode is in use. Valid values are from 0Kbps through
15,000Kbps.

The default value for the ADSL 24-port LIM is 1000Kbps.
Note: Not configured for automatic-at-startup rate adaptation.

Stinger® ADSL 24-Port LIM Guide 1-11

Configuring an ADSL 24-Port Line Interface Module (LIM)

Configuring ATM ADSL-DMT interfaces

Interleaving delay parameters

Data interleaving increases the ability of the system to tolerate noise on the line. However, it
also increases the latency (delay) of the data traffic. When using the interleave channel,
determine the maximum amount of latency by considering the type of traffic sent on the line.
The more tolerant of delay the traffic is, the higher these settings can be.

Following are the Al-Dmt profile parameters shown with default values for specifying the
maximum tolerable delay for interleaver/deinterleaver operations:

[in AL-DMT/{ any-shelf any-slot 0 }:interleave-path-config]
max-delay-up = 16
max-delay-down = 16

Parameter Specifies

Max-Delay-Up Maximum milliseconds of delay allowed in the upstream direction

as a result of interleaving data. The valid range is 0 through 64.

Max-Delay-Down Maximum milliseconds of delay allowed in the downstream

direction as a result of interleaving data. The valid range is 0
through 64.

Noise margin parameters

The bit-error rate (BER) is the percentage of erroneous bits in the total number of transmitted
bits. The noise margins can be controlled to ensure that the line provides a BER of 10
better, as required by DMT standards.

Noise margins are defined in decibels (dB). A BER of 10
certain level of random frequency voltage (noise) with respect to its received signal. If the
maximum noise level is exceeded, the ADSL transceiver unit (ATU) attempts to reduce the
far-end output power. If the noise drops below a minimum margin, the ATU attempts to
increase the far-end power output until the noise level is at or above the configured minimum.

Although the noise-margin settings can be from 1dB through 31dB, the modem software limits
the maximum noise margin to 15dB. If you specify a setting greater than 15dB, the modem
software uses 15dB. Figure 1-2 illustrates the relation ship of margin parameters to power
adjustments.

Figure 1-2. Relationship between no i s e margin parameters and power adjustments

Reduce output power

Steady-state operations

-7

or

-7

represents 0dB. The line tolerates a

Maximum additional
noise margin

Target noise margin

Increase output power

Minimum noise margin
0dB margin

1-12 Stinger® ADSL 24-Port LIM Guide

Configuring an ADSL 24-Port Line Interface Module (LIM)

Configuring ATM ADSL-DMT interfaces

On many loops, the Stinger unit uses large power margins. To avoid excessive power margins,
you can configure the Stinger unit with a maximum downstream noise margin value that it
translates into a maximum power output value. The Stinger unit reduces the transmit power by
a maximum of 12dB to achieve the desired maximum downstream noise margin. On clean
short loops with low requested rates, the margin might still be high but the output power down
is reduced. Power savings are more sig nificant on sh ort loops wher e the requ ested downstrea m
rates are less than the maximum possible—the lower the requested rate, the more transmit
power is saved. For a system with typical noise patterns, set the maxim um m a rgin to a value
close to 8dB. For a system with greater noise patterns, you can set a higher value.

The following sample configuration enables powe r management on an ADSL 2 4-port LIM and
sets the maximum power margin value to 10:

[in AL-DMT/{ shelf-1 slot-2 1 }:margin-config]
admin> set max-add-noise-margin-down = 10

admin> set max-margin-enabled = yes

You cannot set a value for the

max-add-noise-margin-down parameter to a value that is

less than that of the target-noise-margin-down parameter. Doing so causes the
system to generate the following error message:

error: Setting in MARGIN not supported for card.

For a system with typical noise patterns, set the maximum margin to a value close to 8. For a
system with greater noise patterns, you can set a higher value.

Note: The minimum noise margin parameters and the max-add-noise-margin-up
parameter are not used by ADSL 24-port LIMs and are not detailed here. Consult
documentation for the ADSL G.lite LIM for additional information about setting the noise
margin parameters.

Following are the Al-Dmt profile parameters shown with default values for configuring the
noise margins on the ADSL-DMT line for the ADSL 24-port LIMs:

[in AL-DMT/{ any-shelf any-slot 0 }:margin-config]
target-noise-margin-up = 6
target-noise-margin-down = 6
max-add-noise-margin-down = 10
max-margin-enabled = yes

Parameter Specifies

target-noise­margin-up

Upstream noise margin, relative to 0dB, that must be present
before the line can initialize successfully and rate adapt during
normal operations. The valid range is 0dB through 31dB, with a
practical limitation of 15dB set by the modem software.

The default for the ADSL 24-port LIM is 6db.

target-noise­margin-down

Downstream noise margin, relative to 0dB, that must be present
before the line can initialize successfully and rate adapt during
normal operations. The valid range is 0dB through 31dB, with a
practical limitation of 15dB set by the modem software.

The default for the ADSL 24-port LIM is 6dB.

Stinger® ADSL 24-Port LIM Guide 1-13

Configuring an ADSL 24-Port Line Interface Module (LIM)

Configuring ATM ADSL-DMT interfaces

Parameter Specifies

max-add-noise­margin-down

Maximum downstream noise margin beyond the
target-noise-margin-up setting the line tolerates,
relative to 0dB, before attempting to reduce power output. The
valid range is 0dB through 31dB, with a practical limitation of
15dB set by the modem software.

On a system with typical noise patterns, Lucent recommends
approximately 8dB.

max-margin-enabled Enables or disables the maximum downstream noise margin.

• yes—Use the maximum downstream noise margin set with
the add-max-noise-margin-down parameter.

• no—Ignore the maximum downstream noise margin
setting.

Dynamic rate-adaptive noise margin parameters

Dynamic rate adaptation is not yet supported. T herefore, if you set any of the parameters
described in this section, the modem retrains with its previous behavior. When dynamic rate
adaptation is in use, the line adjusts its bit rate dynamically (it upshifts to increase its bit rate or
downshifts to reduce it) on the basis of specified noise margins and intervals for which a noise
level is maintained, provided that the maximum or minimum bit rate has not been reached.
Figure 1-3 illustrates the relationship between margins and dynamic rate adaptation.

Figure 1-3. Future support: Noise margins and dynamic rate adaptation relationship

Increase bit rate (upshift)

Upshift noise margin

Steady-state operations
Steady-state operations

Reduce bit rate (downshift)

Increase output power

Target noise margin

Downshift noise margin

Minimum noise margin
0dB margin

When dynamic rate adaptation is supported, the following param eters will configure it:

[in AL-DMT/{ any-shelf any-slot 0 }:margin-config]
ra-downshift-margin-up = 0
ra-downshift-int-up = 0
ra-downshift-margin-down = 0
ra-downshift-int-down = 0
ra-upshift-margin-up = 0
ra-upshift-int-up = 0
ra-upshift-margin-down = 0
ra-upshift-int-down = 0

1-14 Stinger® ADSL 24-Port LIM Guide

Configuring an ADSL 24-Port Line Interface Module (LIM)

Configuring call-control

Parameter Specifies

Ra-Downshift-Margin-Up Not curr ently u sed. Upstream noise margin relative to 0dB. If the

noise level remains at this value for more than the specified time
interval, the line reduces its upstream bit rate. The valid range is
1dB through 31dB.

Ra-Downshift-Int-Up Not currently used. Number of seconds (1 through 255) the

downshift noise margin may be maintained before the line
reduces its upstream bit rate.

Ra-Downshift-Margin­Down

Ra-Downshift-Int-Down Not currently used. Number of seconds (1 through 255) the

Ra-Upshift-Margin-Up Not currently used. Upstream noise mar gin relative to 0dB. If the

Ra-Upshift-Int-Up Not currently used. Number of seconds (1 through 255) the

Ra-Upshift-Margin-Down Not currently used. Downstream noise margin relative to 0dB. If

Ra-Upshift-Int-Down Not currently used. Number of seconds (1 through 255) the

Not currently used. Downstream noise margin relative to 0dB. If
the noise level remains at this value for more than the specified
time interval, the line reduces its downstream bit rate. The valid
range is 1d B through 31dB.

downshift noise margin may be maintained before the line
reduces its downstream bit rate.

noise level remains at this value for more than the specified time
interval, the line increases its upstream bit rate.The valid range is
1dB through 31dB.

upshift noise margin can be maintained before the line increases
its upstream bit rate.

the noise level remains at this value for more than the specified
time interval, the line increases its downstream bit rate. The valid
range is 1d B through 31dB.

upshift noise margin can be maintained before the line increases
its downstream bit rate.

Configuring call-co ntrol

Using the call-control procedures, you can configure the Stinger to allow connections to be
established even when the line state is not fully up. You can configure the unit to use these
procedures system-wide or on a per-port basis on the DS3-ATM, OC3-ATM, and E3-ATM
trunk modules and on the SDSL, ADSL, and SHDSL/HDSL2 LIMs.

The call-control mechanism enables the Stinger unit to establish and maintain soft PVCs
(SPVCs) across port state changes. This allows xDSL subscribers to establish connections on
LIM interfaces in the operating states before they are fully trained, as well as in the standard
port-up state (in which the modem has successfully trained up). SPVC connections are
accepted when the modem has not fully trained up to the port-up state. If a LIM interface with
an active SPVC connection changes from a port-up state to the state it was in before it was
fully trained, the SPVC remains connected. Connections are broken only if the physical slot or
line stops operating or is disabled by an administrator.

Stinger® ADSL 24-Port LIM Guide 1-15

Configuring an ADSL 24-Port Line Interface Module (LIM)

Configuring call-control

By default, the Stinger unit monitors the physical line state of its interfaces and allows
connections to be established only when the line state is fully up.

Following are examples of the relevant parameters, shown with default settings:

[in SYSTEM]
ignore-lineup = no

[in SDSL/{ any-shelf any-slot 0 }]
ignore-lineup = system-defined

[in DS3-ATM/{ any-shelf any-slot 0 }]
ignore-lineup = system-defined

Parameter Specifies

ignore-lineup

ignore-lineup

In the System Profile, enables or disables the Stinger system’s ability
to ignore line status when determining whether calls are established or
not. Specify one of the following values:

• no (the default)—The Stinger call-control mechanism allows
calls to be established when the line state is up and disallow calls
when the line state is down.

• yes—The Stinger call-control mechanism ignores the line state
and allows calls to be established on a port as long as the
specified slot is operational and the specified port is enabled.

In a Line Profile, specifies whether the line status of a slot has an
effect on the Stinger call control mechanism on the specified port.
Specify one of the following values:

• system-defined (the default)—Sets the Stinger to inherit the
Ignore-Lineup value from the system profile.

• no—Sets the Stinger call-control mechanism to ignore the
systemwide setting and allow calls to be established when the line
state is operational and disallow calls on the port when the line
state is down.

• yes—Sets the Stinger call-control mechanism to ignore the line
state and the systemwide setting and allow calls to be established
on the specified port as long as the specified slot is operational
and the specified port is enabled.

The commands in the following example configure the unit to use the new call-control
procedures systemwide:

admin> read system
SYSTEM read

admin> set ignore-lineup = yes
admin> write

SYSTEM written

When call-control is enabled systemwide, you can disable it on specific interfaces by
modifying the line profile. The commands in the following example disable call-control
procedures on port one of the SDSL 48-port LIM in slot 12:

1-16 Stinger® ADSL 24-Port LIM Guide

Configuring an ADSL 24-Port Line Interface Module (LIM)

Modifying call control to support dual latency

admin> read sdsl { 1 12 1 }
SDSL/{ shelf-1 slot-12 1 } read
admin> set ignore-lineup = no
admin> write
SDSL/{ shelf-1 slot-12 1 } written

Modifying call control to support dual latency

Dual latency splits a DSL data stream into multiple subchannels to transp ort data in parallel.
The number of subchannels depends on the transmission technology. DMT currently supports
two subchannels. Very high bit-rate DSL (VDSL) supports up to five.

Dual latency allows you to set differen t characteri stics for each subchannel, for example fast
on one subchannel and interleave on another. (See “Fast and interleaved bit-rate
parameters” on page 1-10.) Because fast latency is ideal for voice or video (which requires
minimal delays) and interleave is better suited for data applications (which tolerate
greater delays), dual latency is a good solution for voice over ATM or voice over IP. In this
case you would run the voice over the fast subchannel and the data over the interleave
subchannel in parallel for both upstream and downstream.

To obtain dual latency operation, you must set line-latency to both in the AL-DMT
line profile as well as set sub-channel to 2 in ATM-QOS. If latency is not set to both,
even if you set sub-channel to 2 in ATM-QOS, only the lower subchannel is used. When
dual latency is in effect, subchannel 1 is the fast channel and subchannel 2 is the
interleave subchannel.

To understand how DMT prioritizes bandwidth allocation between the two subchannels, bear
in mind that the dual latency scheme is intended for latency-sensitive applications that use the
fast path. While training, the bandwidth requirements in the fast-path-config
subprofile are considered first, and only after they are met are the
interleave-path-config subprofile settings used for the interleave path. For
example, assume you have a sett i ng o f 12 8K bp s s ymmetric in the Fast-Path-Conf ig su bp rofi l e
(four compressed voice channels ) and 8128Kbps and 1024Kb ps in the Interleave-Path- Config
subprofile. When training, first 128Kbps symmetrical are allocated to the fast subchannel,
then whatever is left of the line's capacity is used for the interleave subchannel.

Provisioning a dual latency deployment

The following sample procedure shows how to provision a dual latency deployment with two
virtual channels, one using fast latency for four voice channels over ATM (128Kbps
bandwidth) wit h vpi=0, and vci=40 and the other one using interleave latency for data
with vpi=0, and vci=55.

Setting latency

Both upstream and downstream latencies must be set to both. Y ou cannot have dual l atency in
one direction and single latency in the other. Enable the line and set latency as follows:

super> read al-dmt {1 6 2}
AL-DMT/{ shelf-1 slot-6 2 } read
super> set en = yes

Stinger® ADSL 24-Port LIM Guide 1-17

Configuring an ADSL 24-Port Line Interface Module (LIM)

Modifying call control to support dual latency

super> set line line-latency-down = both
super> write

error: Setting in LINE not supported for card.
super> set line line-latency-up = both

super> write
AL-DMT/{ shelf-1 slot-6 2 } written

LOG notice, Shelf 1, Slot 6, Time: 10:43:12-­Line 2 INS

admin> get al-dmt {1 6 2} line
[in AL-DMT/{ shelf-1 slot-6 2 }:line-config]
nailed-group = 252
vp-switching-vpi = 15
rate-adapt-mode-up = automatic-at-startup
rate-adapt-mode-down = automatic-at-startup
rate-adapt-ratio-up = 100
rate-adapt-ratio-down = 100
max-aggr-power-level-up = 13
max-aggr-power-level-down = 20
max-power-spectral-density = 40
line-code = auto-select
line-latency-down = both
line-latency-up = both
trellis-encoding = yes
gain-default = 20-db
upstream-start-bin = 6
upstream-end-bin = 31
downstream-start-bin = 32
downstream-end-bin = 255
loop-back = none
bit-swapping = yes
fbm-dbm-mode = fbm

Setting the bandwidth

Set the maximum bandwidth for the fast (voice) channel and the interleave (data)
channel as follows:

admin> read al-dmt {1 6 2}
AL-DMT/{ shelf-1 slot-6 2 } read
admin> list fast
[in AL-DMT/{ shelf-1 slot-6 2 }:fast-path-config]
min-bitrate-up = 32
min-bitrate-down = 32
max-bitrate-up = 1000
max-bitrate-down = 8000
planned-bitrate-up = 512
planned-bitrate-down = 1000

admin> set max-bitrate-up = 128
admin> set max-bitrate-down = 128

admin> list
[in AL-DMT/{ shelf-1 slot-6 2 }:fast-path-config (changed)]

1-18 Stinger® ADSL 24-Port LIM Guide

Configuring an ADSL 24-Port Line Interface Module (LIM)

Modifying call control to support dual latency

min-bitrate-up = 32
min-bitrate-down = 32
max-bitrate-up = 128
max-bitrate-down = 128
planned-bitrate-up = 512
planned-bitrate-down = 1000

admin> list .. interleave
[in AL-DMT/{ shelf-1 slot-6 2 }:interleave-path-config]
min-bitrate-up = 32
min-bitrate-down = 32
max-bitrate-up = 1000
max-bitrate-down = 8000
planned-bitrate-up = 512
planned-bitrate-down = 1000
max-delay-up = 16
max-delay-down = 16

admin> set max-bitrate-down = 8128
admin> set max-bitrate-up = 1024
admin> write
AL-DMT/{ shelf-1 slot-6 2 } written

Setting QoS profiles

Set up the QoS profiles for each latency as follows:

admin> new atm-qos voice
ATM-QOS/voice read
admin> list
[in ATM-QOS/voice (new)]
contract-name* = voice
traffic-descriptor-index = 0
traffic-descriptor-type = noclp-noscr
atm-service-category = cbr
peak-rate-kbits-per-sec = 16
peak-cell-rate-cells-per-sec = 37
sustainable-rate-kbits-per-sec = 16
sustainable-cell-rate-cells-per-sec = 37
ignore-cell-delay-variation-tolerance = yes
cell-delay-variation-tolerance = 20
ignore-max-burst-size = yes
max-burst-size = 4
aal-type = aal-0
early-packet-discard = no
partial-packet-discard = no
tag-or-discard = discard
sub-channel = 1

Note: Use subchannel one for fast latency.

admin> write
ATM-QOS/voice written

admin> new atm-qos data
ATM-QOS/data read

Stinger® ADSL 24-Port LIM Guide 1-19

Configuring an ADSL 24-Port Line Interface Module (LIM)

Modifying call control to support dual latency

admin> list
[in ATM-QOS/default]
contract-name* = default
traffic-descriptor-index = 1
traffic-descriptor-type = noclp-noscr
atm-service-category = ubr
peak-rate-kbits-per-sec = 0
peak-cell-rate-cells-per-sec = 0
sustainable-rate-kbits-per-sec = 0
sustainable-cell-rate-cells-per-sec = 0
ignore-cell-delay-variation-tolerance = yes
cell-delay-variation-tolerance = 0
ignore-max-burst-size = yes
max-burst-size = 0
aal-type = aal-0
early-packet-discard = no
partial-packet-discard = no
tag-or-discard = discard
sub-channel = 2

Note: Use subchannel two for interleave latency.

admin> write
ATM-QOS/data written

Setting the connection profiles

Set up the connection profiles for each virtual channel as follows:

admin> new conn voice-6-2
CONNECTION/voice-6-2 read
admin> set active = yes
admin> set atm-options vpi = 0
admin> set atm-options vci = 40
admin> which -n {1 6 2}
Nailed group corresponding to port { shelf-1 slot-6 2 } is 252
admin> set atm-options nailed = 252
admin> set atm-connect vpi = 0
admin> set atm-connect vci = 100
admin> set atm-connect nailed = 801
admin> list atm-qos-options
[in CONNECTION/voice-6-2:atm-qos-options]
usr-up-stream-contract = default
usr-dn-stream-contract = default
admin> set usr-up = voice
admin> set usr-dn = voice
admin> write
CONNECTION/voice-6-2 written

admin> new conn data-6-2
CONNECTION/data-6-2 read
admin> set active = yes
admin> set atm-options vpi = 0
admin> set atm-options vci = 55

1-20 Stinger® ADSL 24-Port LIM Guide

Configuring an ADSL 24-Port Line Interface Module (LIM)

Examples of ADSL-DMT interface configuration

admin> set atm-options nailed = 252
admin> set atm-connect vpi = 0
admin> set atm-connect vci = 100
admin> set atm-connect nailed = 801
admin> list atm-qos-options
[in CONNECTION/voice-6-2:atm-qos-options]
usr-up-stream-contract = default
usr-dn-stream-contract = default
admin> set usr-up = data
admin> set usr-dn = data
admin> write
CONNECTION/data-6-2 written

Examples of ADSL-DMT interface configuration

In Figure 1-4, an ADSL-DMT interface in a Stinger unit is configured to support a
rate-adaptive connection to a DSL-CELL-50A CPE.

Figure 1-4. AD SL ATM LIM configuration

Ethernet

POTS

DSL-CELL-50A

DSL

POTS
splitter

Copper
pair

POTS
splitter
shelf

PBX

ATM

The following commands configure the interface to use a constant, planned
(operator-controlled) bit rate of 56Kbps upstream and 1.5Mbps downstream, using the fast
channel in both directions:

admin> read al-dmt { 1 3 4 }
AL-DMT/{ shelf-1 slot-3 4 } read

admin> set enabled = yes
admin> set line-config line-latency-up = fast
admin> set line-config line-latency-down = fast
admin> set line-config rate-adapt-mode-up = operator-controlled
admin> set line-config rate-adapt-mode-down = operator-controlled
admin> set fast-path-config planned-bitrate-up = 56
admin> set interleave-path-config planned-bitrate-down = 1500

Stinger® ADSL 24-Port LIM Guide 1-21

Configuring an ADSL 24-Port Line Interface Module (LIM)

Checking status of ADSL-DMT interface

admin> write
AL-DMT/{ shelf-1 slot-3 4 } read

The following commands configure the interface to automatically select the best possible rate
at startup time. They specify a possible upstream bit-rate range of 56Kbps through 256Kbps
and a possible downstream bit-rate range of 512Kbps through 1.5Mbps . They also specify use
of the interleaved channel in both directions.

admin> read al-dmt { 1 3 4 }
AL-DMT/{ shelf-1 slot-3 4 } read

admin> set enabled = yes
admin> set line-config rate-adapt-mode-up = automatic-at-startup
admin> set line-config rate-adapt-mode-down = automatic-at-startup
admin> set line-config line-latency-up = interleave
admin> set line-config line-latency-down = interleave
admin> set interleave-path-config min-bitrate-up = 56
admin> set interleave-path-config max-bitrate-up = 256
admin> set interleave-path-config min-bitrate-down = 512
admin> set interleave-path-config max-bitrate-up = 1500
admin> write

AL-DMT/{ shelf-1 slot-3 4 } read
The following commands reserve VPI 7 for VP switching on the interface:
admin> read al-dmt { 1 3 4 }

AL-DMT/{ shelf-1 slot-3 4 } read
admin> set line-config vp-switching-vpi = 7
admin> write

AL-DMT/{ shelf-1 slot-3 4 } read

Checking status of ADSL-DMT interface

The system creates an Al-Dmt-Stat profile for each ADSL-DMT interface. The profiles
provide statistics and connection status. Following are the relevant parameters, shown with
sample settings for an active line:

[in AL-DMT-STAT/{ shelf-1 slot-3 4 }]
physical-address* = { shelf-1 slot-3 4 }
line-state = active
spare-physical-address = { any-shelf any-slot 0 }
sparing-state = sparing-none
sparing-change-reason = unknown
sparing-change-time = 0
sparing-change-counter = 0
vpi-vci-range = vpi-0-15-vci-32-127
vp-switching-vpi = 15

1-22 Stinger® ADSL 24-Port LIM Guide

Configuring an ADSL 24-Port Line Interface Module (LIM)

Checking status of ADSL-DMT interface

physical-status = { 0 coe port-up 128 2944 fast fast 1.4.1 2 0 1 init-+
physical-statistic = { { 1 1 1 } yes 3 passed 3 6 56 19 5 41 11 0 0 0 +}

Parameter Specifies

Line-State The overall state of the line. Values are:

• does-not-exist—Link is not physically present on board.

• disabled—Line is disabled.

• active—Multipoint is established.

Spare-Physical-Address Shelf, slot, and port number of the spare (redundant) LIM.
Sparing-State The state of the redund ancy f unction . If r edun dancy is n ot enabled,

sparing-none is the value. If sparing is enabled and the LIM

slot is a primary LIM, the value can be

primary-inactive

. If sparing is enabled and the LIM slot is

the secondary (spare) LIM, the value can be

active

or secondary-inactive.

Sparing-Change-Reason How redundancy is activated. Valid values are

primary-active or

secondary-

inactive,

manual and automatic.

Sparing-Change-Time The time that the last change in redundancy state occurred.
Sparing-Change-Counter Each redundancy change, for example, primary to secondary,

secondary to primary, increments the counter. The counter is reset
when the Stinger starts or restarts.

VPI-VCI-Range The valid range of VPI and VCI for the circuits established for the

line. This range can change only after LIM reboot.

VP-switching-VPI The VPI to be used for the VP switching. The rest of the VPIs are

used for the VC switching.

Checking status of the physical interface

The Physical-Status subprofile provides information about the physical interface. The interface
uses its unused bandwidth to run a con tinuous bit-err or-ra te test (BERT), so bit-error counts are
always available without explicitly running a BERT and disrupting data transmission.
Integrated BERT results are displayed by the Accum-Bit-Err, Num-Sec-Valid, and
Num-Sec-Invalid parameters.

Following are the Physical-Status parameters shown with sample settings for an active
interface:

[in AL-DMT-STAT/{ shelf-1 slot-3 4 }:physical-status]
if-group-index = 0
unit-type = coe
dev-line-state = port-up
up-stream-rate-fast = 0
down-stream-rate-fast = 0
up-stream-rate-interleave = 128000
down-stream-rate-interleave = 2944000
up-stream-latency = interleave
down-stream-latency = interleave
firmware-ver = 1.4.1

Stinger® ADSL 24-Port LIM Guide 1-23

Configuring an ADSL 24-Port Line Interface Module (LIM)

Checking status of ADSL-DMT interface

ansi-adsl-ver = 2
initial-adsl-ver = 0
hardware-ver = 1
modem-hw-state = init-ok
accum-bit-err = 0
num-sec-valid = 91
num-sec-invalid = 0
operational-mode = g.lite

Parameter Indicates

IF-Group-Index SNMP interface group index of the line.
Unit-Type Operating mode (should always be COE).
Dev-Line-State The current state of the interface. Valid values are as follows:

•

down—Either there is no connection or the interface is

disabled.

•

activation—Interface is trying to train but not

detecting a modem on the other end.

training—Training with a modem on the other end.

•

• port-up—Interface is successfully trained up.

•

failed—Interface failed training (usually a log

message gives the reason).

loopback—Interface is in special loopback test mode.

•

Up-Stream-Rate-Fast Upstream data rate in bps when latency is fast. Zero means

that latency is set to interleave or the data rate is
unknown.

Down-Stream-Rate-Fast Downstream data rate in bps when latency is fast. Zero

means that latency is set to interleave or the data rate is
unknown.

Up-Stream-Rate-Interleave Upstream data rate in bps when latency is interleave.

Zero means that latency is set to fast or the data rate is
unknown.

Down-Stream-Rate-Interleave Downstream data rate in bps when latency is interleave.

Zero means that latency is set to fast or the data rate is
unknown.

Up-Stream-Latency Operational upstream latency (

none, fast, or

interleave). The none setting indicates that the line is

not operational.

Down-Stream-Latency Operational downstream latency (none, fast, or

interleave). The none setting indicates that the line is

not operational.
Firmware-Ver Version number of the ADSL modem firmware.
ANSI-ADSL-Ver Supported issue of the ANSI T1.413 standard (Issue 2).
Hardware-Ver Hardware version of the ADSL modem.

1-24 Stinger® ADSL 24-Port LIM Guide

Configuring an ADSL 24-Port Line Interface Module (LIM)

Checking status of ADSL-DMT interface

Parameter Indicates

Modem-Hw-State State of the interface after initialization. Valid values are

init-ok (all is well), bad-sdram, bad-cache, or bad-

cache-sdram

. The last three values imply memory

problems, probably associated with a self-test failure.
Accum-Bit-Err Number of actual bit errors detected during the continuous

BERT.
Num-Sec-Valid How many seconds were error free during the continuous

BERT.
Num-Sec-Invalid How many error seconds were detected during the continuous

BERT.
Operational-Mode ADSL coding protocol as automatically detected or set by

user. Valid values are ANSI dmt, g.lite, or g.dmt.

Displaying ADSL-DMT port status and nailed groups

To display the nailed-group numbers for ADSL-DMT lines, use the Dmtal command. For
example, the following command output shows the nailed-group numbers for an ADSL-DMT
module in slot 4:

admin> dmtal -a
All ADSL lines:

(dvOp dvUpSt dvRq sAdm nailg)
Line { 1 4 1 } (Up Idle UP UP 00151)
Line { 1 4 2 } (Up Idle UP UP 00152)
Line { 1 4 3 } (Up Idle UP UP 00153)
Line { 1 4 4 } (Up Idle UP UP 00154)
Line { 1 4 5 } (Up Idle UP UP 00155)
Line { 1 4 6 } (Up Idle UP UP 00156)
Line { 1 4 7 } (Up Idle UP UP 00157)
Line { 1 4 8 } (Up Idle UP UP 00158)
Line { 1 4 9 } (Up Idle UP UP 00159)
Line { 1 4 10 } (Up Idle UP UP 00160)
Line { 1 4 11 } (Up Idle UP UP 00161)

....

Obtaining statistics about operations

The Physical-Statistic subprofile enables you to check interface operations. Following are the
Physical-Statistic parameters shown with sample settings for an active interface:

[in AL-DMT-STAT/{ shelf-1 slot-3 4 }:physical-statistic]
line-up-timer = { 0 0 1 }
rx-signal-present = yes
up-dwn-cntr = 3
self-test = passed
noise-margin-down = 6
attenuation-down = 56
output-power-down = 19

Stinger® ADSL 24-Port LIM Guide 1-25

Configuring an ADSL 24-Port Line Interface Module (LIM)

Checking status of ADSL-DMT interface

noise-margin-up = 5
attenuation-up = 41
output-power-up = 11
near-end-fec = 0
near-end-crc = 0
near-end-hec = 0
far-end-fec = 10
far-end-crc = 0
far-end-hec = 0
received-rs-blcks = 104073
transmitted-rs-blocks = 416772 incoming-cells = 92
outgoing-cells = 100

Parameter Indicates

Line-Up-Timer How long the interface has been up (days, hours, and minutes in

{dd hh mm} format.
RX-Signal-Present Receiving (yes) or not receiving (no) signal from the CPE.
Up-Down-Cntr Number of times the link has transitioned from an Up state to a

Down state since the module was last reset.
Self-Test Whether the port has passed the modem chipset self-test.
Noise-Margin-Down Current downstream noise margin in dB.
Attenuation-Down Current downstream attenuation in dB .
Output-Power-Down Current downstream aggregate power level in dBm.
Noise-Margin-Up Current upstream noise margin in dB.
Attenuation-Up Current upstream attenuation in dB.
Output-Power-Up Current upstream aggregate power level in dBm.
Near-End-FEC Forward error correction (FEC) errors detected by the COE ADSL

transceiver unit (ATU).
Near-End-CRC Cyclic redundancy check (CRC) errors detected by the COE ATU.
Near-End-HEC Header error control (HEC) errors detected by the COE ATU.
Far-End-FEC Forward error correction (FEC) errors detected by the CPE ATU.
Far-End-CRC Cyclic redundancy check (CRC) errors detected by the CPE ATU.
Far-End-HEC Header error control (HEC) errors detected by the CPE ATU.
Received-Rs-Blcks Number of received Reed-Solomon blocks. Enabled on 24-port

and 48-port LIMs only.
Transmitted-Rs-Blocks Number of transmitted Reed-Solomon blocks.
Incoming-Cells Number of incoming cells.
Outgoing-Cells Number of outgoing cells.

1-26 Stinger® ADSL 24-Port LIM Guide

Configuring LIM and LIM Port Redundancy

Overview of LIM and LIM port redundancy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Configuring LIM redundancy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Configuring LIM port redundancy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

You can configure LIM and LIM port redundancy for more than one kind of LIM in a single
Stinger chassis. For example, a single Stinger unit with both asymmetric digital subscriber line
(ADSL) and symmetric digital subscriber line (SDSL) LIMs can be configured with a spare
ADSL LIM and a spare SDSL LIM.

Overview of LIM and LIM port redundancy

A spare LIM can replace an entire failed LIM or a single failed por t. LIM redundancy tr ansfers
all logical connections from a failed LIM to the spare LIM. LIM port redundancy transfers the
logical connection from a particular failed port on a LIM to the corresponding port on the spare
LIM. The remaining ports on the spare LIM remain available to provide additional LIM port
redundancy.

2

Each LIM to be used as a spare must have either a path selector module (PSM) or copper loop
test (CLT) module plugged in behind or next to it in place of a line protection module (LPM).
All other LIMs must use an LPM with port redundancy (LPM-PR) for line protection.

Note: Some older Stinger units are equipped with an interface redundancy module (IRM)
located behind the spare LIM, and LPMs with redundancy (LPM-R) located behind the LIMs
to be backed up. In this case, additional configuration steps might be needed. For more
information, see “LIM redundancy with IRMs and LPM-Rs” on page 2-7.

Configuring LIM redundancy

LIM redundancy provides a one-to-one backup function for LIMs. Each type of LIM to be
backed up requires a spare LIM with a PSM or CLT module plugged in behind or next to it. For
example, a Stinger FS unit configured with 14 ADSL 24-port LIMs can be set up with the
following module pairs:

• 13 pairs each consisting of an ADSL LIM and an LPM-RP

• 1 pair consisting of an ADSL LIM and a PSM or CLT m odu le

The resulting system has 13 active ADSL LIMs and one spare that can be substituted for any
one of the 13 LIMs if a failure occurs.

Stinger® ADSL 24-Port LIM Guide 2-1

Configuring LIM and LIM Port Redundancy

Configuring LIM redundancy

In the same way, a unit can be equipped with the following module pairs:

• 6 SDSL LIM–LPM-RP pairs

• 1 SDSL–PSM pair or SDSL–CLT module pair

• 6 ADSL LIM–LPM-RP pairs

• 1 ADSL–PSM pair or ADSL–CLT module pair

The resulting system has 6 active SDSL LIMs and 6 active ADSL LIMs, with 1 spare LIM of
each type available in case of failure.

When the redundancy function is invoked, the primary LIM is deactivated. Its logical
connections are terminated and reestablished on the spare (secondary) LIM. When the
redundancy function is disabled, the spare LIM is deactivated. Its logical connections are
terminated and reestablished on the primary LIM.

Figure 2-1 illustrates LIM redundancy for a failed SDSL LIM in slot 4 of a Stinger FS chassis.
A Stinger LS chassis has its LPMs and PSMs or CLT modules next to its LIMs rather than
behind them as shown here.

Figure 2-1. LIM redundancy in a Stinger FS unit

Overview of the LIM-Sparing-Config profile

When a Stinger unit is booted, it checks for the presence of PSMs or CLT modules. A

LIM-Sparing-Config profile is created for each PSM or CLT module detected. You manage

LIM redundancy by configuring the LIM-Sparing-Config profile on a spare LIM of the same
type as the LIM to be backed up.

2-2 Stinger® ADSL 24-Port LIM Guide

Configuring LIM and LIM Port Redundancy

Configuring LIM redundancy

Following is a listing of a LIM-Sparing-Config profile with all parameters set to their default
values:

[in LIM-SPARING-CONFIG/{ any-shelf any-slot 0 }]
physical-address* = { any-shelf any-slot 0 }

spare-slot-type = none
sparing-mode = inactive
spare-slot-number = slot-16
manually-spared-slot-number = any-slot
auto-lim-sparing-config = { [ { yes 10 100 12 } { yes 10 100 12 } { yes
10 100 +

The Auto-LIM-Sparing-Config subprofiles are discussed separately in “Automatic LIM
redundancy” on page 2-4.

Parameter Specifies

spare-slot-type Type of spare LIM installed in the slot. This value is

automatically detected and set by the software when the
Stinger powers up.

sparing-mode Enable/disable redundancy. You can enable two LIM

redundancy modes.

• inactive setting—disables the LIM redundancy
function.

• manual setting—deactivates the LIM specified in the
manually-spared-slot-number parameter,

terminating its connections and then reestablishing
them on the spare LIM. For more information, see

“Manual LIM redundancy” on page 2-4.

• automatic setting—allows automatic LIM

redundancy to be activated as defined in the

Auto-LIM-Sparing-Config subprofile. See “Automatic

LIM redundancy” on page 2-4.

spare-slot-number Number of the slot containing the spare LIM and PSM or

CLT module. This param e ter valu e is automatically set by
the software when the Stinger unit is turned on.

manually-spared-slot­number

Slot number of the primary LIM to be manu ally deactivated
and replaced by the spare LIM.

For example, suppose a Stinger unit is configured with an ADSL LIM in slot 1 and an SDSL
LIM in slot 4. Slot 14 contains a spare ADSL LIM with a PSM, and slot 16 contains a spare
SDSL LIM also with a PSM.

The system creates two

admin> dir lim-sparing-config
72 06/20/1999 01:21:15 { shelf-1 slot-14 0 }

72 06/21/1999 17:14:09 { shelf-1 slot-16 0 }

LIM-Sparing-Config profiles like the following:

The spare ADSL LIM has the following profile:

Stinger® ADSL 24-Port LIM Guide 2-3

Configuring LIM and LIM Port Redundancy

Configuring LIM redundancy

admin> read lim-sparing-config { 1 14 0 }
LIM-SPARING-CONFIG/{ shelf-1 slot-14 0 } read
admin> list
[in LIM-SPARING-CONFIG/{ shelf-1 slot-14 0 }]
physical-address* = { shelf-1 slot-14 0 }
spare-slot-type = al-dmtadsl-atm-card
sparing-mode = inactive
spare-slot-number = slot-14
manually-spared-slot-number = slot-any
auto-lim-sparing-config = { [ { yes 10 100 12 } { yes 10 100 12 } { yes
10 100 +

Similarly, you can display the profile for the spare SDSL LIM:

admin> read lim-sparing-config { 1 16 0 }
LIM-SPARING-CONFIG/{ shelf-1 slot-16 0 } read
admin> list
[in LIM-SPARING-CONFIG/{ shelf-1 slot-16 0 }]
physical-address* = { shelf-1 slot-16 0 }
spare-slot-type = sdsl-atm-card
sparing-mode = inactive
spare-slot-number = slot-16
manually-spared-slot-number = slot-any
auto-lim-sparing-config = { [ { yes 10 100 12 } { yes 10 100 12 } { yes
10 100 +

Manual LIM redundancy

You can invoke the redundancy function manually by setting the sparing-mode parameter
to manual. To disable manual redundancy, set the sparing-mode parameter to
inactive.

If manual redundancy is currently in use, setting the parameter to inactive causes the spare
LIM to become inactive again, terminating its connections and then reestablishing them on the
primary LIM that was replaced.

For example, referring to Figure 2-1, suppose that the SDSL LIM in slot 4 fails. To enable the
spare SDSL LIM in slot 16, proceed as follows:

admin> read lim-sparing-config { 1 16 0 }
LIM-SPARING-CONFIG/{ shelf-1 slot-16 0 } read
admin> set manually-spared-slot-number = 4
admin> set sparing = manual
admin> write
LIM-SPARING-CONFIG/{ shelf-1 slot-160 } written

LOG notice, Shelf 1, Slot 8, Time: 01:30:02-­ LIM 16 ACTIVATED as spare for LIM 4

Automatic LIM redundancy

Automatic LIM redundancy detects a LIM failure and automatically sets up all the virtual
channels of that LIM on the spare. When automatic LIM redundancy is activated, the primary

2-4 Stinger® ADSL 24-Port LIM Guide

Configuring LIM and LIM Port Redundancy

Configuring LIM redundancy

LIM is monitored. If modem errors exceed the specified thresholds, all connections to the
primary LIM are transferred to the spare (secondary) LIM.

Monitoring continues on the secondary LIM. If modem errors exceed thresholds, the
connections are transferred back to the primary LIM and the automatic redundancy process
stops. You can restart th e pro cess by resetting the system or by setting the sparing-mode
parameter to inactive and then back to automatic.

The parameters related to automatic LIM redundancy are found in the

Auto-LIM-Sparing-Config subprofiles. The subprofiles are numbered according to the LIM

slot numbers. These subprofiles apply only to tho se LI Ms that are of the same type as the LIM
specified by the spare-slot-type parameter

in the LIM-Sparing-Config profile.

For example, suppose slot 16 in a Stinger FS units contains a spare SDSL LIM, slots 1 through
7 contain SDSL LIMs, but slots 10 through 15 contain ADSL LIMs. Only the parameters
contained in LIM-Sparing-Config subprofiles 1 through 7 are applied to automatically replace
the SDSL LIMs in slots 1 through 7.

Note: Following an automatic LIM or LIM port redundancy switchover, some sessions might
not start up even though the physical port switchover is successful.

Following is a listing of an

Auto-LIM-Sparing-Config subprofile with all parameters set to

their default values:

[in LIM-SPARING-CONFIG:auto-lim-sparing-config:lim-sparing-config[1]]
active = yes
error-averaging-period = 10
error-threshold = 100
up-down-threshold = 3
modem-failure-threshold = 12

Parameter Specifies

active When redundancy mode is set to automatic, this

parameter enables or disables the LIM slot to participate in
automatic LIM redundancy. Only slots for which this
parameter is set to yes can be backed up by the spare. The
default value is yes.

error-averaging-period Number of seconds during which the number of errors

specified by error-threshold

must be observed on

the line before the modem is considered nonfunctional.
The default value is 10.

error-threshold Number of errors that can occur during the specified

error-averaging-period interval before a modem

on this LIM is considered nonfunctional. The default
value is 100.

up-down-threshold Number of times during the specified

error-averaging-period interval that the line is

connected and disconnected by the modem before the
modem is considered nonfunctional. The default value
is 3.

Stinger® ADSL 24-Port LIM Guide 2-5

Configuring LIM and LIM Port Redundancy

Configuring LIM redundancy

Parameter Specifies

modem-failure-threshold Number of modems on this LIM that are considered

To activate automatic LIM redundancy for a particular LIM, you must set the following two
parameters:

• In the LIM-Sparing-Config profile for the spare LIM, set the following active
parameter to yes: Auto-LIM-Sparing-Config > LIM-Sparing-Config
[slot number of backed-up LIM]

• In the LIM-Sparing-Config profile for the spare LIM, set the sparing-mode parameter
to automatic.

For example, if you install a spare SDSL LIM in slot 15 of a Stinger FS unit and want to
activate automatic LIM redundancy for the SDSL LIMs in slots 1 through 7, proceed as
follows:

nonfunctional before this LIM is considered
nonfunctional. The default value is 12.

> active.

1 List the

admin> list 1
[in LIM-SPARING-CONFIG/{ shelf-1 slot-15 0}
:auto-lim-sparing-config:lim-sparing-config[1]]
active = yes
error-averaging-period = 10
error-threshold = 100
up-down-threshold = 3
modem-failure-threshold = 12

Auto-LIM-Sparing-Config profile for slot 1.

Because the Auto-LIM-Sparing-Config subprofiles are numbered according to the LIM
slot numbers, the list 1 command here lists the LIM-Sparing-Config subprofile for the
LIM in slot 1.

Note that the active parameter is set to yes. Because this is the default value for all
seven slots, you do not have to set it unless you have previously changed it.

2 Set the redundancy mode.

admin> list
[in LIM-SPARING-CONFIG/{ shelf-1 slot-15 0 }]
physical-address* = { shelf-1 slot-15 0 }
spare-slot-type = sdsl-atm-card
sparing-mode = inactive
spare-slot-number = slot-15
manually-spared-slot-number = any-slot
auto-lim-sparing-config = { [ { yes 10 100 3 12 } { yes 10}]}

admin> set sparing-mode = automatic
admin> write
LIM-SPARING-CONFIG/{ shelf-1 slot-15 0 } written

Assuming that the active parameters in the LIM-Sparing-Config subprofiles for slots 2
through 7 are also set to the default, LIM redundancy is now activated for the SDSL LIMs in
slots 1 through 7.

2-6 Stinger® ADSL 24-Port LIM Guide

LIM redundancy with IRMs and LPM-Rs

When you upgrade the software to TAOS 7.11.4 or later, a previously existing

LIM-Sparing-Config profile is automatically converted to a redundancy profile indexed to the

spare LIM slot. Enter the dir lim-sparing-config command to verify that the profile
has been created.

For example, suppose a Stinger FS unit already has a spare SDSL LIM and IRM installed and
configured in slot 16 before the softwar e upgrade. Enter the dir command to show the profile:

admin> dir lim-sparing-config
213 06/20/1999 02:25:18 { shelf-1 slot-16 0 }

Then list the profile:

admin> read lim-sparing-config { 1 16 0 }
admin> list
[in LIM-SPARING-CONFIG/{ shelf-1 slot-16 0 } ]

physical-address* = { shelf-1 slot-16 0 }
spare-slot-type = sdsl-atm-card
sparing-mode = inactive
spare-slot-number = slot-16
manually-spared-slot-number = any-slot
if-sparing-config = [ any-slot any-slot any-slot any-slot any-slot
any-slot any+
auto-lim-sparing-config = { [ { yes 10 100 3 12 } { yes 10 100 3 12 } {
yes 10 +

Configuring LIM and LIM Port Redundancy

Configuring LIM redundancy

If a profile exists, nothing further needs to be done until the LIM redundancy function is
activated. If no profile exists, you must create the profile manually for the slot number
containing the spare LIM and IRM. All the LIMs to be backed up must have either LPM-Rs or
LPM-RPs installed in the s lots behind or next to them.

When the profile is created, the software automatically assigns a value to the
spare-slot-type and spare-slot-number parameters.

For example, if a Stinger unit has an SDSL LIM and an IRM installed in slot 16, and it also has
an SDSL LIM with an LPM-R installed in slot 4, you must first create a

LIM-Sparing-Config

profile for slot 16:

admin> new lim-sparing-config { 1 16 0 }
LIM-SPARING-CONFIG/{ shelf-1 slot-16 0 } read

admin> write
LIM-SPARING-CONFIG/{ shelf-1 slot-16 0 } written

admin> list
[in LIM-SPARING-CONFIG/{ shelf-1 slot-16 0 } (new)]

physical-address* = { shelf-1 slot-16 0 }
spare-slot-type = sdsl-atm-card
sparing-mode = inactive
spare-slot-number = slot-16
manually-spared-slot-number = any-slot
if-sparing-config = [ any-slot any-slot any-slot any-slot any-slot
any-slot any+

Stinger® ADSL 24-Port LIM Guide 2-7

Configuring LIM and LIM Port Redundancy

Configuring LIM redundancy

auto-lim-sparing-config = { [ { yes 10 100 3 12 } { yes 10 100 3 12 } {
yes 10 +

Suppose the SDSL LIM in slot 4 fails. You can then activate manual LIM redundancy as
follows:

admin> set manually-spared-slot-number = 4
admin> set sparing-mode = manual
admin> write

LIM-SPARING-CONFIG/{ shelf-1 slot-16 0 } written
LOG notice, Shelf 1, Slot 8, Time: 26:30:01-­ LIM 16 ACTIVATED as spare for LIM 4

Checking LIM redundancy status

You can check the status of LIM redundancy by examining the LIM-Sparing-Status profile.
Following are the parameters with sample read-only values:

[in LIM-SPARING-STATUS]
spare-slot-type = none
sparing-mode = primary-inactive
spare-slot-number = any-slot
spared-slot-number = any-slot
sparing-change-reason = unknown
sparing-change-time = 0
sparing-change-counter = 0
lim-sparing-status = [ { yes yes sparing-none } { yes yes sparing-none
} { yes +

A LIM-Sparing-Status subprofile is defined for each slot as follows:

[in LIM-SPARING-STATUS:lim-sparing-status[1]]
active = yes
lim-status-ok = yes
sparing-state = sparing-none

Parameter Indicates

spare-slot-type Shelf, slot, and port number of the spare LIM.
sparing-mode State of the redundancy function. If redundancy is not

enabled, sparing-none is the value. If redundancy is
enabled and the LIM slot is a primary LIM, the value can
be primary-active or primary-inactive. If
redundancy is enabled and the LIM slot is the secondary
(spare) LIM, the value can be secondary-active or

secondary-inactive.
spare-slot-number Slot number of the spare LIM for that type of LIM.
spared-slot-number Slot number of the LIM being replaced by the spare LIM.
sparing-change-reason How redundancy is activated. Valid values are

inactive, automatic, and manual.
sparing-change-time Time that the last change in redundancy state occurred.

2-8 Stinger® ADSL 24-Port LIM Guide

Configuring LIM and LIM Port Redundancy

Parameter Indicates

sparing-change-counter Number of redundancy changes (for example, primary to

secondary or secondary to primary). The counter is reset

to zero each time the Stinger is turned on.

active Valid values are yes and no.
lim-status-ok Valid values are yes and no.
sparing-state State of the redundancy function. If redundancy is not

enabled, sparing-none is the value. If redundancy is

enabled and the LIM slot is a primary LIM, the value can

be primary-active or primary-inactive. If

redundancy is enabled and the LIM slot is the secondary

(spare) LIM, the value can be secondary-active or

secondary-inactive. A value of

not-applicable indicates that LIM redundancy is not

applicable to this module.

Checking status with the Rearslot command

Configuring LIM redundancy

The rearslot command shows the status of all the slots used for LPMs, PSMs, and CLT
modules. It also reports on the status of the midplane redundancy bus. Slots that are equipped
with IRMs or LPM-Rs are reported as Empty by the rearslot command.

Note: When a copper loop is being tested on a Stinger LS unit with a PSM or a CLT module,
the rearslot command does not display any midplane sparing bus usage.

For example, suppose that a Stinger FS is equipped with ADSL LIMs and SDSL LIMs. The
ADSL 24-port LIM in slot 1 has failed and is being replaced by the ADSL 24-port LIM in
slot 14. The rearslot command reports the following information.

admin> rearslot
Slot Slot ID
[ 1 ] 91 24 port Enhanced LPM
[ 2 ] 0 Empty ( IRM, LPM )
[ 3 ] 0 Empty ( IRM, LPM )
[ 4 ] 92 48 port Enhanced LPM)
[ 5 ] 0 Empty ( IRM, LPM )
[ 6 ] 0 Empty ( IRM, LPM )
[ 7 ] 0 Empty ( IRM, LPM )
[ 10 ] 0 Empty ( IRM, LPM )
[ 11 ] 0 Empty ( IRM, LPM )
[ 12 ] 0 Empty ( IRM, LPM )
[ 13 ] 0 Empty ( IRM, LPM )
[ 14 ] 93 Path Selector Module ( PSM )
[ 15 ] 0 Empty ( IRM, LPM )
[ 16 ] 94 Copper Loop Tester ( CLT )

Midplane sparing bus usage :
4 4 3 2 1
8765 4321 0987 6543 2109 8765 4321 0987 6543 2109 8765 4321

.... .... .... .... .... .... XXXX XXXX XXXX XXXX XXXX XXXX

Stinger® ADSL 24-Port LIM Guide 2-9

Configuring LIM and LIM Port Redundancy

Configuring LIM port redundancy

Configuring LIM port re dundancy

LIM port redundancy allows an individual port of a LIM to be backed up by the corr esponding
port of a spare LIM. The LIM to be backed up (the primary LIM) must be of the same type as
the spare. The remaining ports on the spare LI M remain av ailable to back up o t her f ailed por ts
on any LIMs of the same type in the system.

More than one kind of LIM port can be backed up. An additional LIM-PSM pair (or LIM-CL T
module pair) of another type installed in a Stinger unit can be used to back up other LIMs of
that type in the system. For example, a spare SDSL LIM in slot 16 can back up any failed port
on any other SDSL LIMs in a Stinger FS chassis. Likewise, a spare ADSL LIM in slot 14 can
back up any failed ADSL ports.

However, because the midplane redundancy bus in a Stinger unit contains only one path for
each port number , p ort r edun dan cy can back up on ly o ne p ath of a p articular n umb er at a time .
For example, suppose port 1 on an SDSL LIM fails and is replaced. As long as redundancy is
active on that port, no other failed SDSL or ADSL port 1 on that unit can be replaced by a
spare LIM port.

For example, port 2 on an ADSL LIM in slot 1 can be backed up by port 2 of the spare ADSL
LIM in slot 14. A subsequent failure of port 6 on an SDSL LIM in slot 4 can be backed up by
port 6 on the spare SDSL LIM in slot 16. This example is illustrated for a Stinger FS chassis in
Figure 2 -2. A Stinger LS chassis has its LPMs and PSMs or CLT modules next to its LIMs
rather than behind them.

Note: Following an automatic LIM or LIM port redundancy switchover, some sessions might
not start up even though the physical port switchover is successful.

2-10 Stinger® ADSL 24-Port LIM Guide

Configuring LIM and LIM Port Redundancy

Figure 2-2. LIM port redundancy on a Stinger FS unit

Configuring LIM port redundancy

When a port on a LIM that is being backe d up is replaced, the v i rtual ch annels fo r that p ort are
terminated and set up on the spare. All other line parameters are also transferred to the spare
port.

Enabling LIM port redundancy

Redundancy for a particular slot and port is controlled by the sparing-mode parameter in
the appropriate LIM profile.

The sparing-mode parameter appears in all LIM profiles, as in the following SDSL profile
for slot 2, port 6:

[in SDSL/{ shelf-1 slot-2 6 }]
name = 1:2:32
physical-address* = { shelf-1 slot-2 6 }
enabled = yes
sparing-mode = inactive
line-config = { 0 232 15 static { any-shelf any-slot 0 }
singlebaud 784000 2720+

Stinger® ADSL 24-Port LIM Guide 2-11

Configuring LIM and LIM Port Redundancy

Configuring LIM port redundancy

Parameter Specifies

sparing-mode Enables or disables port redundancy and specifies the mod e. You can set

the following port-re dundancy modes:

• inactive—disables LIM port redundancy. This is the default.

• manual—deactivates the LIM port and then reestablishes the

connection on the same port of the spare LIM.

• automatic—activates automatic redundancy for the port. The
error threshold parameters specified in the
Auto-LIM-Sparing-Config subprofile of the
LIM-Sparing-Config

Manual LIM port redundancy

You can invoke the redundancy function manually by setting the sparing-mode parameter
in the LIM profile to manual. The connection on the primary LIM is transferred to the spare
(secondary) LIM. To disable manual port redundancy, set the sparing-mode parameter to

inactive.

[slot number]profile are used.

If manual redundancy is currently in use, setting the parameter to inactive causes the spare
LIM port to become inactive again, terminating its connections and then reestablishing them
on the primary LIM port that was replaced.

For example, suppose a Stinger FS unit is equipped with an ADSL LIM in slot 1 and an SDSL
LIM in slot 4. Spare LIMs are located in slots 14 and 16 respectively . Port 2 fails on the ADSL
LIM, and port 6 fails on the SDSL LIM. To provide redundancy for these ports, proceed as
follows:

1 Activate redundancy for failed port 2 in slot 1:

admin> read al-dmt {1 1 2}
admin> set sparing-mode = manual
admin> write
LOG notice, Shelf 1, Slot 8, Time: 11:58:49-­ LIM 14 port 2 ACTIVATED as spare for LIM 1 Port 2

2 Activate redundancy for failed port 6 in slot 4:

admin> read sdsl {1 4 6}
admin> set sparing-mode = manual
admin> write
LOG notice, Shelf 1, Slot 8, Time: 12:07:51-­ LIM 16 port 6 ACTIVATED as spare for LIM 4 Port 6

Automatic LIM port redundancy

Automatic LIM port redundancy detects a LIM port failure and automatically tran sfers the port
connection to the same port on the spare LIM. When automatic LIM port redundancy is
activated, the primary LIM port is monitored . If mo dem error s exceed the specified thres holds,
the port connection to the primary LIM is transferred to the spare (secondary) LIM.

Monitoring continues on the secon dary LIM p ort. If modem er rors again exceed thresholds , the
connection is transferred back to the primary LIM port and the automatic redundancy process

2-12 Stinger® ADSL 24-Port LIM Guide

Configuring LIM and LIM Port Redundancy

Configuring LIM port redundancy

stops. You can restart th e pro cess by resetting the system or by setting the sparing-mode
parameter to inactive and then back to automatic.

The parameters used for automatic LIM port redundancy are found in the
Auto-LIM-Sparing-Config subprofile of the

LIM-Sparing-Config profile for the spare

LIM of the same type.
For example, suppose you want to set up automatic port redundancy for port 1 in an SDSL

LIM in slot 5 with an error threshold of 50. The spare SDSL LIM is located in slot 16 of a
Stinger FS.

The threshold parameters reside in the Auto-LIM-Sparing-Config

LIM-Sparing-Config profile in slot 16.

1 List the parameters:

admin> list 1
[in LIM-SPARING-CONFIG/{ shelf-1 slot-16 0 }:
auto-lim-sparing-config:lim-sparing-config[1]]
active = yes
error-averaging-period = 10
error-threshold = 100
up-down-threshold = 3
modem-failure-threshold = 12

2 Set the error-threshold parameter:

admin > set error-threshold = 50
admin > write
SDSL/{ shelf-1 slot-16 0 } written

3 Activate automatic redundancy for port 1 in slot 5:

admin > read sdsl {1 5 1}
admin > set sparing-mode = automatic
admin > write
SDSL/{ shelf-1 slot-5 1 } written

Checking the status of extended LIM port redundancy

subprofile of the

The line status profile for a particular LIM shows port redundancy status for the selected port,
and information about a spare LIM if one exists. The LIM line status profiles have five
parameters to indicate the port redundancy status.

Following are the relevant parameters, shown with sample read-only settings for an active line
using an SDSL LI M:

[in SDSL-STAT/{ shelf-1 slot-4 6 }]
spare-physical-address = { shelf-1 slot-16 6 }
sparing-state = primary-inactive
sparing-change-reason = manual
sparing-change-time = 309108872
sparing-change-counter = 1

Parameter Indicates

spare-physical-address Shelf, slot, and port number of spare LIM.

Stinger® ADSL 24-Port LIM Guide 2-13

Configuring LIM and LIM Port Redundancy

Configuring LIM port redundancy

Parameter Indicates

sparing-state

sparing-change-reason How redundancy is activated. Valid values are inactive,

sparing-change-time Time that the last change in redundancy state occurred.
sparing-change-counter Number of redundancy changes (for example, primary to

State of the redundancy function. If redundancy is not
enabled, sparing-none is the value. If redundancy is
enabled and the LIM slot is a primary LIM, the value can be
primary-active or primary-inactive. If
redundancy is enabled and the LIM slot is the secondary
(spare) LIM, the value can be secondary-active or

secondary-inactive.

manual, and automatic.

secondary or secondary to primary). The counter is reset to
zero each time the Stinger unit is turned on.

2-14 Stinger® ADSL 24-Port LIM Guide