Cisco VISM User Manual

Cisco VISM Installation and Configuration Guide

Release 3.0 June 2004

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Cisco VISM Installation and Configu ration Guide

Preface xiii

Objectives xiii Audience xiii Document Organization xiii Related Documentation xiv

Cisco MGX 8850 (PXM45) Multiservice Switch Release 3 xiv MGX 8850 (PXM1) Multiservice Switch Release 1.2.10 xv MGX 8250 Edge Concentrator Release 1.2.10 xvi

MGX 8230 Edge Concentrator Release 1.2.10 xvi Conventions xvii Obtaining Documentation xviii

Cisco.com xviii

Ordering Documentation xviii Documentation Feedback xviii Obtaining Technical Assistance xix

Cisco TAC Website xix

Opening a TAC Case xix

TAC Case Priority Definitions xx

Obtaining Additional Publications and Information xx

CHAPTER

1 Overview of the VISM and VISM-PR Cards 1-1

VISM and VISM-PR Card Types 1-1

VISM and VISM-PR Card Service Types 1-5 VISM and VISM-PR Card Physical Characteristics 1-5

VISM Card Architecture 1-5 VISM and VISM-PR Card Features 1-6

Redundancy and Bulk Distribution 1-8

Operating Modes 1-9

VoIP Switching and Switched AAL2 PVC Operating Modes 1-9 AAL2 Trunking Operating Mode 1-11 VoIP Trunking Operating Mode 1-12 AAL1/AAL2 SVC Operating Mode 1-12

Installing VISM Hardware and Software 1-13

Installing VISM Cards in MGX 8000 Series Chassis 1-13

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Contents

Installing VISM-PR Cards in MGX 8000 Series Chassis 1-13

MGX 8850 and MGX 8250 Chassis 1-14 MGX 8230 Chassis 1-15

Installing VISM and VISM-PR Front and Back Cards 1-15

Installing a VISM or VISM-PR Front Card 1-15 Installing a VISM Back Card 1-16 Connecting Cables to Cards 1-16

Removing VISM and VISM-PR Front and Back Cards 1-17

Removing a VISM or VISM-PR Front Card 1-17

Removing a VISM Back Card 1-17 Applying Power to the VISM Card 1-18 Installing VISM Software Upgrades 1-18

Software Upgrades 1-20

Prerequisites 1-20 VISM/VISM-PR Upgrades with PXM1 1-20

Download VISM/VISM-PR Boot Code and Firmware to PXM1 1-20

Upgrade VISM/VISM-PR Firmware with PXM1 Card 1-21

Boot Code Upgrade Procedure with PXM1 Cards 1-23 VISM-PR Upgrades with PXM1E and PXM45 1-23

Download VISM-PR Boot Code and Firmware to PXM1E and PXM45 1-24

Upgrade VISM-PR Firmware with PXM1E and PXM45 Cards 1-24

Boot Code Upgrade Procedure with PXM1E and PXM45 Cards 1-25 VISM/VISM-PR Downgrade Procedure 1-25 VISM to VISM-PR Hardware Upgrade 1-26

CHAPTER

2 Telephony Applications Using VISM 2-1

Tandem Switch Offloading 2-1 Multiservice Access 2-3 AAL2 Trunking 2-3

3 VISM Functional Description 3-1

TDM Line-Handling Function 3-2 Bearer Processing Function 3-3

Echo Cancellation, Voice Compression, A/Mu Law Conversion 3-3 Voice Activity Detection and Silence Suppression 3-4 Fax and Modem Tone Detection 3-4 Jitter Control 3-5 CAS Handling 3-5

Signaling Function 3-5

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CAS Processing in VoIP Switching and Switched AAL2 PVC Operating Mode 3-6 CCS Processing in Switched AAL2 PVC Operating Mode 3-9 CAS Processing in AAL2 Trunking Operating Mode 3-11 CCS Processing in AAL2 Trunking Operating Mode 3-11

ATM Voice Data Processing Function 3-11

Transporting Voice Cells with VoIP 3-11 Transporting Voice Cells with Switched AAL2 PVC 3-13 Transporting Voice Cells with AAL2 Trunking 3-14 Transporting Voice Cells with Switched AAL1 SVC 3-14

Call Control Function 3-15

Connection Model 3-16 xGCP Extensions for AAL2 Switched PVC and AAL2 SVC Operating Modes 3-17 Endpoint Service States 3-17 Restart In Progress Command 3-18 Connection Admission Control 3-19

Contents

CHAPTER

Embedded VISM Management Function 3-19

4 Configuring VISM Features 4-1

Using the Command Line Interface 4-1

VISM Command Attributes 4-2

Connecting to Cisco MGX 8000 Series Platforms 4-2

Logging In to PXM and VISM Cards 4-3

VISM Card Prompt 4-5

Logging Out of VISM and PXM Cards 4-5

Configuring VISM Features 4-6

Initial VISM Configuration 4-6 Initial Card Level Configuration 4-8

Configuring the Operating Mode 4-8 Allocating Resources 4-9 Configuring Connection Admission Control 4-10 Placing the VISM Card In Service 4-11 Placing the VISM Card Out of Service 4-11

Configuring the TDM Side 4-11

Configuring T1 and E1 Lines 4-11

Configuring the PXM and VISM Cards Clocking Source 4-14

Configuring the PXM1E or PXM45 Card as Clocking Source 4-17 Configuring DS0 Channels 4-17

Configuring Bearer Processing 4-27

Configuring Codecs 4-27

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Configuring ECAN 4-29

Configuring Jitter 4-30

Configuring PNNI for AAL1/AAL2 SVCs 4-31 Configuring the ATM Network Side 4-31

Configuring PVC Connections for All Operating Modes 4-32

Configuring VoIP Switching/Trunking Operating Mode Parameters 4-34

Configuring AAL2 Trunking Operating Mode Parameters 4-36

Configuring Switched AAL2 PVC Operating Mode Parameters 4-38 Configuring the Call Agent Interface 4-44

Configuring Domain Names and IP Addresses 4-45

Setting Up Call Agents and Protocols 4-45

Configuring Gateway Control Protocols 4-47

Configuring ISDN PRI Backhaul 4-49

Configuring Additional VISM Features 4-52

Mid-Call DTMF 4-55 Configurable Jitter Buffer 4-55 Adjustable Gain 4-55 Adjustable Music On-Hold Threshold 4-55 CALEA 4-55 MGC Redundancy 4-55 External DNS 4-56 2 IP Address Support 4-56 VoIP Trunking 4-56 T.38 Fax Relay 4-57 CAS Feature Enhancements 4-57

Programmable Tone Plans 4-57

Loop Start, DID, and Delay Dial 4-58

FGD 4-58

Configure Flash Hook and Glare Condition Attributes 4-59

Configure ANI and DNIS Digit Order 4-59

RFC 3064 Package Support 4-59 RFC 2833 Support 4-59 VISM Network Continuity Test 4-59 Configure PVC OAM Cell Parameters 4-60 PXM1E and PXM45 Card-Only Features 4-60 Call Agent-Controlled VoATM AAL1 and AAL2 SVC 4-61 AAL1 SVC-Based TDM Hairpinning 4-61 High Complexity Codec Support for VISM-PR—G.723.1 4-61 Announcement File System 4-62

Announcement Timeouts 4-62

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Announcement Direction 4-62 Broadcast Announcements 4-63 Multiple Announcement Requests for the Same Endpoint 4-63 Announcement File Server 4-63 Announcement File Server Name 4-63 Announcement File Server Directory Structure 4-63 VISM Announcement Cache Management 4-64 Announcement Expiry 4-64

Permanent Announcements 4-64 Call Agent-Controlled T.38 Fax 4-65 Additional Support for MGCP 1.0 4-66 RSVP-Based Admission Control 4-66 Clock Slip Counters 4-67 RTP Connection Statistics 4-68 CAS Immediate Start and Ground Start Glare Handling 4-68 Grooming for Local Traffic 4-68 MGX 8000 Series Implementation Enhancements 4-69

Additional VBR Enhancements 4-69

Expanded Clock Source Selection 4-69

Private Network-to-Network Interface Priority Routing 4-69

Additional SPVC Connection Management Capabilities 4-70

192 T1/248 E1 DS0 Support with High Complexity Codecs on VISM-PR 4-70

Channel Alarm Enhancement 4-70

VISM TDM Line Statistics Collection 4-70

Contents

CHAPTER

5 CLI Commands 5-1

6 Troubleshooting Tips 6-1

VISM Card LEDs 6-1 VISM and PXM Display, Log, and Diagnostic Loopback Path CLI Commands 6-2

VISM Display Card CLI Command 6-3 PXM Display Log CLI Command 6-3 PXM Diagnostic Loopback Path CLI Commands 6-4 PXM1E and PXM 45 Display CLI Commands 6-4

VISM Alarms 6-5 UNIX Snoop Trace Tool 6-5 Symptoms and Solutions 6-5

VISM Card Did Not Become Active 6-6 T1/E1 Configuration Mismatch 6-6

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Contents

DSP Download Failure 6-7 VISM Front Card/Back Card Mismatch 6-8 Cannot Use the cc Command to Access a VISM Card 6-9 VISM Card Resets Intermittently 6-9 VISM Card Does Not Accept a Firmware Download 6-9 Echo Is Heard on a Voice Call 6-9 VISM Card LEDs Are Not Lighted 6-9 Firmware Does Not See the Card Insert Bit Status As Set 6-10

APPENDIX

INDEX

A VISM and VISM-PR Card Clocking Options A-1

PXM1 Card as Primary Clocking Source A-1 VISM Card as Primary Clocking Source A-3 VISM-PR Card as Primary Clocking Source A-3 PXM1E or PXM45 Card as Primary Clocking Source A-4 Revertive and Nonrevertive Clocking A-4

B VISM and VISM-PR—3.0 Specifications B-1

VISM Card Specifications B-1 VISM Card Physical Interface Specifications and Applicable Standards B-1

General VISM Card Standards B-2 VISM Card Counters Specifications B-2

VISM-PR Card Specifications B-3

VISM-PR Card Features B-3

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FIGURES

Figure 1-1 VISM T1 and E1 Front Cards 1-2 Figure 1-2 VISM-PR T1 and E1 Front Cards 1-3 Figure 1-3 VISM T1 and E1 Back Cards 1-4 Figure 1-4 Cisco MGX 8850 and VISM as a Voice Gateway 1-4 Figure 1-5 VISM Card Block Diagram 1-6 Figure 1-6 VISM Block Diagram for VoIP Switching and Switched AAL2 PVC Operating Modes 1-10 Figure 1-7 VISM Block Diagram for the AAL2 Trunking Operating Mode 1-11 Figure 1-8 Available Chassis Slots for VISM Cards in the MGX 8850 and MGX 8250—Front View 1-14 Figure 1-9 Available Chassis Slots for VISM Cards in the Cisco MGX 8230—Front View 1-15 Figure 1-10 RJ-48 PIN Connector 1-17 Figure 2-1 VISM Used in a Tandem Switch Offloading Application 2-1 Figure 2-2 VISM Used as a Voice Gateway Application 2-2 Figure 2-3 AAL2 Trunking—One End 2-3 Figure 2-4 AAL2 Trunking—Two Ends 2-4 Figure 3-1 VISM Detailed Functional Blocks 3-2 Figure 3-2 VISM Signaling Paths 3-6 Figure 3-3 CAS Processing—Message Structure 3-7 Figure 3-4 CAS Signaling in Initiating and Terminating a Call 3-8 Figure 3-5 PRI/Backhaul Path 3-10 Figure 3-6 RUDP Session Hierarchy 3-10 Figure 3-7 VoIP Protocol Stack 3-12 Figure 3-8 VoIP Cell Packetization and Transmission 3-12 Figure 3-9 AAL2 Cell Packetization and Transmission 3-14 Figure 3-10 Call Agent Communications Links 3-15 Figure 3-11 Connection Model 3-16 Figure 3-12 VISM Card Config Screen—Card Elements Display 3-20 Figure 3-13 VISM Card Config Screen—VISM Features Display 3-21 Figure 4-1 PXM Back Card 4-3 Figure 4-2 VISM to Call Agent Communication 4-44 Figure 6-1 VISM Front Card LEDs 6-2 Figure A-1 VISM Configured for Local Clocking A-1

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Figure A-2 VISM Configured for Loop Clocking A-3

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TABLES

Table 1 Cisco MGX 8850 (PXM45) Multiservice Switch Release 3 Documentation xiv Table 2 MGX 8850 (PXM1) Multiservice Switch Release 1.2.10 Documentation xv Table 3 MGX 8250 Edge Concentrator Release 1.2.10 Documentation xvi Table 4 MGX 8230 Edge Concentrator Documentation xvi Table 5 Cisco VISM Related Documentation xvii Table 3-1 Supported Codecs and Packetization Periods 3-4 Table 4-1 VISM Command Attributes—Log File, Card State, and Privilege Level 4-2 Table 4-2 Mandatory Initial VISM Configuration Command Sequence for All Operating Modes 4-7 Table 4-3 VISM/VISM-PR DS0 Density with Codec Support 4-17 Table 4-4 dspaal2profile Field Descriptions 4-39 Table 4-5 AAL2 Operating Mode Profiles 4-40 Table 4-6 VISM 3.0 Built-in (Preconfigured) Tone Plans 4-57 Table 4-7 VISM/VISM-PR and MGX 8000 Series Switch Support 4-60 Table 4-8 Announcement File System Feature CLI Commands 4-64 Table 4-9 MGCP 1.0 Feature CLI Commands 4-66 Table 4-1 0 RSVP-Based Admission Control Feature CLI Commands 4-67 Table 11 VISM/VISM-PR DS0 Density with Codec Support 4-70 Table 5-1 Tone Plan Definition File Syntax 5-46 Table 5-2 Codec Type Default Values 5-153 Table 5-3 VISM Release 2.2(0) Built-in Tone Plans 5-442 Table 6-1 VISM T1 and E1 Card Alarms 6-5 Table A-1 Revertive/Nonrevertive Clocking and PXM Back Card Support A-5

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Objectives

Audience

Preface

This preface describes the objectives, audience, organization, and conventions of the Cisco VISM Installation and Configuration Guide.

This document describes the features, functions, installation, operation, and command line interface of Cisco Voice Interworking Service Module (VISM ) Releas e 3.0.

This document is intended for the following personnel:

• Technicians responsible for installing V ISM card s o n the Cisco MG X 8230, MGX 82 50, a nd

MGX 8850 sh el f.

• Network administrators respo nsible for configuring th e Cisco MGX 8850 shelf.

Cisco recommends that installers be familiar with electronic circuitry and wiring practices and have experience as an electronic or electromechanical technician. Installers and network administrators should also be familiar with Cisco switches and routers, T1 and E1 voice lines, and Cisco wide area networks. Cisco also recommends that you have a system administrator present who is familiar with your network and UNIX servers during the initial installation of a Cisco MGX 8000 Series platform.

Document Organization

This document contains the following chapters:

• Chapter 1, “Overview of the V ISM and VI SM-P R Ca rds,” provid es a general intro duction to VISM

and describes the hardware and software mod ules, and insta llation pr oced ures.

• Chapter 2, “Telephony Applications Using VISM,” describes VISM applications for a variety of

voice networking situations.

• Chapter 3, “VISM Functional Description,” describes VISM’s functional operation.

• Chapter 4, “Configuring VISM Features,” describes the initial mandatory configuration procedures

for using VISM cards in each of the operating modes.

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Conventions

Document Description

Cisco MGX 8850 Multiservice Switch Installation and Configuration, Release 1.1.3 1

Cisco MGX 8800 Series Switch Command Reference, Release 1.1 .31

Cisco MGX 8250 Edge Co nc en trator I nstall ation and Configuration, Release 1.1.3 1

Cites MGX 8250 Multiservice Gateway Command Reference, Release 1.1 .31

Cisco MGX 8230 Edge Co nc en trator I nstall ation and Configuration, Release 1.1.3 1

Cisco MGX 8230 Mul tiserv ice Ga teway C ommand Reference, Release 1.1 .31

1.1.32 Version Software Release Notes Cisco WAN MGX 8850, 8230, and 8250 Softwa re

Cisco MGX 8850 shelf installation procedures—refer to the sections describing the insta llation an d configurati on of the PXM1 ca rd.

Cisco MGX 8800 shelf command line interface commands—refer to the comman ds t h at ap ply t o t he P X M1 ca rd .

Cisco MGX 82 50 sh elf i nsta llat ion pr oced ure s—r ef er to the se cti ons describing the installa tion and con figuration of the PXM1 card.

Cisco MGX 8250 shelf command line interface commands—refer to the comman ds th at ap ply t o the PX M 1 ca rd .

Cisco MGX 82 30 sh elf i nsta llat ion pr oced ure s—r ef er to the se cti ons describing the installa tion and con figuration of the PXM1 card.

Cisco MGX 8230 shelf command line interface commands—refer to the comman ds t h at ap ply t o t he P X M1 ca rd .

Hardware and software featur e upgrade s for the Cisco MG X 8850, MGX 8230 , and MGX 8250.

Conventions

This publication uses the fol lowing conventions to describe co mmand s:

• Bold type—indicates command names and user entry text.

• Italic type—indicates arguments for whic h you suppl y values.

• | |—vertical bars indicate optional arguments.

This publication uses the fol lowing conventions to describe examp les:

• Courier font—indicates terminal sessi ons and system display inf ormatio n.

• Courier bold font —indi cat es u ser e ntr y.

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Obtaining Documentation

Note Means reader take note. Notes contain helpful suggestions or references to materials not contained

in this manual.

Caution Means reader be careful. In this situation, you might do something that could result in equipment

damage or loss of data.

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Cisco documentatio n and a dd ition al lite rat ure a r e available on Cisc o.co m. Cisc o al so provide s s everal ways to obtain technical assista nce an d othe r techni cal re sour ces. Thes e secti ons explain how to obtain technical information from Cisco Systems.

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You can access the most c ur rent Cisc o doc um ent ation on the World Wide Web at this URL:

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You can access the Cisco website at this URL:

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International Cisco websites can be accessed from this URL:

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You can order Cisco documentation in these ways:

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Documentation Feedback

You can submit e-mail com me nts a bo ut t ech ni cal doc um enta ti on t o bug-do c@ cisc o. com.

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You can submit comments by using the respon se card (if p resent ) behind the front cover of your document or by wri ting t o the fo llowing a ddress:

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Cisco TAC Website

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Opening a TAC Case

Using the online TAC Case Open Tool is the fastest way to open P3 and P4 cases. (P3 and P4 cases are those in which your network is minimally impaired or for which you require product information.) After you describe your situa ti on, t he TAC Case Open Tool automaticall y re co mm ends reso urc es f or an immediate solution. If your issue is not resolved using the recommended resources, your case will be assigned to a Cisco TAC engineer. The online TAC Case Open Tool is located at this URL:

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For P1 or P2 cases (P1 and P2 ca ses a re th ose in whi ch yo ur produ ct ion net work is down or severely degraded) or if you do not have Internet ac c ess, co nt act Ci sco TAC by telephone. Cisco TAC engineers are assigned immediatel y to P1 and P2 cases to hel p keep your business operat ions runni ng smoothly.

To open a case by te leph one, use o ne of the following numbe rs: Asia-Pacific: +61 2 8446 7411 (Australia : 1 800 805 227)

EMEA: +32 2 704 55 55 USA: 1 800 553-2447

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TAC Case Priority Definitions

T o en sure that all cases are reported in a standa rd format , Cisco has established case priority definitions. Priority 1 (P1)—Your network is “down” or there is a critical impact to your business operations. You

and Cisco will commit all necessary resources around the clock to resolve the situation. Priority 2 (P2)—Operat ion of an existin g network is severely degraded , or significant aspects of your

business operation are negatively affected by inadequate performance of Cisco products. You and Cisco will commit full-time resources during normal business hours to resolve the situation.

Priority 3 (P3)—Ope ra tiona l pe rf orma nce of yo ur net work is im pair ed, but m ost business opera ti ons remain functional. You and Cisco will commit resources during normal business hours to restore service to satisfactory levels.

Priority 4 (P4)—You require information or assistance with Cisco product capabilities, installation, or configuration. There is littl e or no effect on you r business operations.

Obtaining Additional Publications and Information

Preface

Information about Cisco products, technologies, and network solutions is available from various online and printed sources.

• Cisco Marketplace provides a variety of Cisco b ook s, refe renc e guid es, a nd logo m erch and ise . Go

to this URL to visit the company store:

http://www.cisco.com/go/marketplace/

• The Cisco Product Catalog describes the networking products offered by Cisco Systems, as well as

ordering and custome r support ser vices. Ac cess the Cisc o Product Ca talog at this URL:

http://cisco.com/univercd/cc/td/doc/pcat/

• Cisco Press publishes a wide range of general networking , training and certif ication titles. Both ne w

and experienced users will benefit from these publications. For current Cisco Press titles and other information, go to Cisco Press online at this URL:

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• Packet magazine is the Cisco quart erly pub licatio n that provides the latest networki ng trend s,

technology breakthrough s, and Cisco products an d solutions t o help ind ustry professi onals ge t the most from their networking investment. Included are networking depl oyment an d troublesho oting tips, configuration e xamples, customer case studies, tutorials and train ing, certificatio n information, and links to numerous in-de pth onli ne resour ces. You can access Packet magazine at this URL:

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• iQ Magazine is the Cisco bimonthly publication that delivers the latest information about Internet

business strategies for executives. You can access i Q Magazi ne at this URL:

http://www.cisco.com/go/iqmagazine

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Preface

Obtaining Additional Publications and Information

• Internet Protocol Journal is a quarterly journal published by Cisco Systems for engin eering

professionals involved in designing, developing, and ope ratin g p ubli c a nd pr ivate internets a nd intranets. You can access the Internet Protocol Journal at this URL:

http://www.cisco.com/ipj

• Training—Cisco offers world-class networking t raining. Curren t offerings in network tra ining are

listed at this URL:

http://www.cisco.com/en/US/learning/index.html

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Preface

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CHAPTER

Overview of the VISM and VISM-PR Cards

This chapter provides a gene ral intr oduction t o VISM and VI SM-PR an d describ es the hardwar e and software modules, and instal lation pr ocedure s. The fo llowing topics ar e descri bed:

• “VISM and VISM-PR Car d Types” section on page 1-1

• “VISM and VISM-PR Car d Physical Char acteri stics” sect ion on page 1-5

• “VISM and VISM-PR Car d Feature s” sectio n on page 1-6

• “Installing VISM Hardware and Software” section on page 1-13

• “Software Upgrades” sect ion on page 1-20

Note The term VISM is used to refer to the product software—either for the VISM card or for the

VISM-PR card. The t erms VI SM and VIS M-PR ar e used whe n discus sing hardwa re onl y.

The VISM card, in co mbinat ion wi th a Cisco M GX 8000 Series platf orm, en ables tel ephone c alls on conventional time-division multiplexed (TDM) voice circuits to be transported over an Asynchronous Transfer Mode (ATM) packet-swi tc hed and VoIP networks. The VISM card is a s ingl e he ight card designed to operate in t he f ollowing pl atfor ms:

• Cisco MGX 8850 Rel ease 1, wi de a rea sw itch

• Cisco MGX 8250, e dg e co nc entr ato r

• Cisco MGX 8230, e dg e co nc entr ato r

Note VISM is not support ed o n the Cisc o MG X 8 260 swi tch.

VISM and VISM-PR Card Types

VISM and VISM-PR c ards ar e inst alle d in Cisc o MGX 8 000 Se ries swit ches as front card s and the ir associated b ack card s— card sets. Th ere ar e two type s of VI SM front card s (see Figure 1-1):

• AX-VISM-8T1—Support s u p to eig ht T 1 lines car rying d igitiz ed voice

• AX-VISM-8E1—Support s u p to eig ht E 1 lines car rying d igitiz ed voice

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Note Using the Servi ce Resour ce Modul e ( SRM) a nd the 1 :N redun da ncy feat ures , ot h er phy sica l

configurations are supported. Refer to the “VISM and VISM-PR Ca rd Feat ures ” se ctio n on page 1-6 for more detail s.

Figure 1-1 VISM T1 and E1 Front Cards

Chapter 1 Overview of the VISM and VISM-PR Cards

CLEI code label

ACT

STBY

FAIL

PORT 1

PORT 2

PORT 3

PORT 4

PORT 5

PORT 6

PORT 7

PORT 8

VISM

8T1

T1 front card

ACT

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PORT 3

PORT 4

PORT 5

PORT 6

PORT 7

PORT 8

VISM

8E1

E1 front card

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Chapter 1 Overview of the VISM and VISM-PR Cards

C E H

S L

There are two types of VISM-PR front cards (see Figure 1-2):

• MGX-VISM-PR-8T1— Supports up to eight T1 lines carrying di gitized voice

• MGX-VISM-PR-8E1— Supports up to eight E1 lines carrying di gitized voice

Figure 1-2 VISM-PR T1 and E1 Front Cards

Card Extractor

Release Slot

VISM and VISM-PR Card Types

ard xtractor

CLEI Code Lab

andle

tatus

EDs

ACT

STBY

FAIL

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PORT 2

PORT 3

PORT 4

PORT 5

PORT 6

PORT 7

PORT 8

VISM

PR-8T1

ACT

STBY

FAIL

PORT 1

PORT 2

PORT 3

PORT 4

PORT 5

PORT 6

PORT 7

PORT 8

VISM

PR-8T1

72673

T1 E1

The VISM and VISM-PR front cards have the same associated back cards. There are two types of VISM/VISM-PR T1 back cards (see Figure 1-3):

• AX-RJ48-8T1—Support s e ight T1 li nes us in g R J-48 con ne ctors ; use wit h a T 1 f ron t car d.

• AX-R-RJ48-8T1—Suppor ts eig ht T 1 lin es; use wit h a re dundan t T1 f ro nt c ard.

There are four types of V ISM/VIS M-PR E1 back cards (see Figure 1-3):

• AX-RJ48-8E1—Suppor ts e ight E1 li nes us ing R J-48 c onn ector s; use with an E 1 front ca rd.

• AX-R-RJ48-8E1—Suppor ts eig ht E 1 lin es; use wit h a re dundan t E1 f ro nt c ard.

• AX-SMB-8E1—Suppor ts ei ght E1 line s us ing SM B conne ct ors; use wit h an E1 f ront car d.

• AX-R-SMB-8E1—Supp orts eig ht E 1 lines; use wit h a r e dundan t E1 f ro nt c ard.

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Figure 1-3 VISM T1 and E1 Back Cards

Chapter 1 Overview of the VISM and VISM-PR Cards

RJ48-8T1

T1-RJ48 E1-RJ48 E1-SMB

RJ48-8E1

SMB-8E1

RX1

TX1

RX2

TX2

RX3

TX3

RX4

TX4

RX5

TX5

RX6

TX6

RX7

TX7

RX8

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R-RJ48-8T1

E D U N D

A N

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R-SMB-8E1

R E D U N D A N

Redundant

E1-SMB

71218

The VISM or VISM-PR card and MGX 8000 Series switch combination provides an interface, or voice gateway, between conventional TDM networks and packet -switc hed networks (se e Figure 1-4).

Figure 1-4 Cisco MGX 8850 and VISM as a Voice Gateway

PBX or

Central Office

T1/E1

Voice/TDM Networks

MGX 8850

with

VISM

Packet Network

(IP/ATM)

Packet Networks

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Connection to the packet network is pe rformed by Cisco MG X 8000 Series sw itch Processor Module cards—PXM1, PXM1E, and PXM45—whi ch communica te with a VISM card through the switch’s midplane cellbus. Refer to the documents listed in Table 5 of the “Related Documentation” section on

page xiv for more informat ion on the MGX 8000 Series sw itch midp lane cel lbus.

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VISM and VISM-PR Card Service Types

VISM cards are configured with the following service types:

• Constant bit rate (CBR)

Note CBR is not supported with a combination of a PXM1 with either an RPM or external

router.

• Variabl e bit ra te real tim e, VBR (RT)

• VBR non-real time (NRT)

VISM-PR card con nec tions w ith the R PM -PR ca rd re qu ire s th e V BR (NRT) 3 servic e t ype o n t h e PXM1E and PXM45 platforms.

If you are using a VISM-PR card in com binatio n with a PXM1 E, PXM45, or RPM-PR card , you must use the VBR (NRT) 3 selection when adding a connection.

The following connection ser vice t ypes can be c onfigured wit h VISM 3.0 and higher:

• VBR (RT) 2

VISM and VISM-PR Card Physical Characteristics

• VBR (RT) 3

• VBR (NRT) 2

VISM and VISM-PR Card Physical Characteristics

VISM cards are equipped with the following:

• Eight T1 or E1 po rt s

• Digital signal processors (DSPs)

• High-level data link control (HDLC) framer

• Broadband interface to the packet network

VISM Card Architecture

VISM card architecture provides the following:

• Flexibility that allows the incorporation of new or improved technology as it becomes available.

• Application flexibility that allows VISM to be used in a range of situations that provide

interoperability with a wide variety of equipment types.

• Modularity that allows equipment to be purchased and installed as it is needed for scalability.

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Figure 1-5 sh ows a simplified diagram of the VISM architecture and its major components.

Figure 1-5 VISM Card Block Diagram

Chapter 1 Overview of the VISM and VISM-PR Cards

VISM

Main CPU

(Control)

Cellbus

Framers

8 T1/E1 lines

from PBX or entral Office

Digital Signal Processors

HDLC

Processor

Secondary CPU

(Datamover)

SAR

PXM

OC-3 to ATM Packet Netwo

1429

The card is broadly divided into a TDM side and an ATM side. The T1/E1 framers, the array of DSPs, and the HDLC processor support the TDM side. The ATM adaptation layer (AAL) and the segmentation and reassembly (SAR) sec tions sup port the ATM side.

VISM is under the con trol of two i ndep en dent proc es sors. T he mai n pr oc ess or pe rfo rm s the c on trol tasks—configuration, ca ll setup a nd tea rdown, and m anag emen t. The secon d pro cessor, the datamover, handles the movin g and p roc essin g of t he voice and voic eb an d dat a t r affic through the syst em.

The VISM card i tsel f co ntain s no por ts fo r the con ne ction of ma nage ment sta tio ns. Workstations, PCs, or terminals used t o ma nage VI SM mu st be att ached vi a t he PX M c ard whi ch pr ovides both se rial EIA/TIA-232 and Ethe rnet por ts.

VISM and VISM-PR Card Features

VISM cards process high -densit y digit al voice c irc uits a nd provide d yna mic com pressi on, ec ho cancellation, dejittering, silence suppression, and packetization. The VISM card uses the following features which you c an c onfigu re:

• Eight standard T1 or E1 interfaces with the following line coding:

–

Bipolar 8-zero sub st itu tion ( B8Z S)—f or T1

–

Alternate mar k inversion (A MI)— f or T1

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High density bipolar 3 (HDB3)—for E1

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• Voice over ATM (VoATM) using AAL2 cells—No Logical Link Control/Subnetwork Access

Protocol (LLC/SNAP) encapsulation.

Note Multiplexing is not suppo rte d f or A AL2 SVCs.

• VoIP using AA L5 c ells to R F C 1889 .

• Extended Superframe (ESF) fram ing with or without cyclic redunda ncy check (CRC).

• Pulse code modulation (PCM) A/Mu law codecs.

• Programmable 24, 3 2, 48, 6 4, 80 , 96, 1 12, 1 28 ms tai l d ela y n ear end EC AN.

• Voice compression with the follow ing standards:

–

G.711

–

G.726-16k

–

G.726-24k

–

G.726-32k

–

G.726-40k

VISM and VISM-PR Card Features

–

G.729a

–

G.729ab

–

G.723.1-H

–

G.723.1a-H

–

G.723.1-L

–

G.723.1a-L

Note The G.723.1 codecs are not supported in combination with the VISM card. The G.723.1

codecs are supported with the VISM-PR card.

• Nx64 clear channel (N = 1 only) suppor t.

• Voice activity detection (VAD) and comfort noise generation (CNG) using variable threshold energy

(Cisco proprietar y).

• Call agent Simple Gateway Control Protocol (SGC P) Version 1.0, 1.1, 1.5, SGCP 1.1+, 1.5, and

Media Gateway Control Protocol ( M GCP) 0 .1 and 1.0.

• Backhauling channel associated signaling (CAS) signaling to a call agent using xGCP (backhauling

can be accomplished with any supported SGCP and MGCP protoc ol).

• Backhauling Primar y Rat e Int erfac e (PRI ) sign al ing via R eli abl e Us er D at agra m Prot oco l (RUDP)

to a call agent.

• Common channel signaling (CCS) transport across an AAL5 trunk.

• Fax and modem VoIP bearer transmissi ons.

• Dual (redundant) virtual c ircuits a cross the pa cket network .

• Full continuity testing (CO T ). Supports origination and terminat ing loop back and tra nsponder CO T

between VISM and the central office on the TDM side.

• Loop timing, whi ch ca n be u sed a s th e ma ster cl ock fo r t he e nt ire MG X 80 00 Ser ies pla tfor m an d

local clock.

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• Line loopback (DS1) toward t he T DM l ines .

• Channel loopback (D S0) t oward both t he T D M l ine s and t he ATM network.

• Transmission and reception of bit error ra te tester (BERT) signals over loopbacked lines.

• Redundant alarm indi cati on si gnal (R AI) and a larm i n dica tion signa l ( AIS ) alarm s.

• Extracting a DS0 CCS channel and directing it to the TDM signaling function.

• 1:N cold redundancy using subrate multiplexing (SRM)-3T3 (bulk mode support for T1 lines only)

and SRM-E (for OC3) capabilities. Calls do not persist during switchover.

• Graceful shutdown of ongoing voice calls when the V ISM is taken out of service for ma intenan ce

or other reasons. Forced shutdown is also suppo rted.

Caution A forced shutdown of the VISM or V ISM-PR car d m ay r esul t i n dro ppe d ca ll s.

Redundancy and Bulk Distribution

Redundancy for VISM c ards with or wi thout bulk d istr ibution ca n b e pr ovided t hrou gh the Servi ce Redundancy Module (SRM) and SRM -E. Redund ancy for VISM i s also provided by Media Gat eway Controller (MGC) redundancy groups. VISM redundancy is cold redundancy in which ongoing calls do not persist during switchover.

Chapter 1 Overview of the VISM and VISM-PR Cards

Note SRM-E is supported with PXM1 and PXM1 E card s only.

Redundancy with bulk dist ribution re quires a spare VISM card to be installed . The system uses the three T3 ports of the SRM back card instead of the normal T1 lines on the VISM back cards. VISM cards in bulk distribution mode do not require back cards.

The TDM voice data tr ansmitted or rec eiv ed o ver th e T3 ports are di strib uted to the VISM ca rd as if they had been received over VISM T1 back card ports in the normal manner. This feature reduces the number of physical lines required to support VISM, but requires external equipment to multiplex and demultiplex the T1 data onto the T3 lines.

With or with out bu lk distrib ution, r edundancy al lo ws for the spar e VISM card to automatical ly take o ver the functions of a failed VISM card . When the failed card is repa ired, switching back to the repa ired card is not automatic. You must manually change the repai red car d back to the acti v e state with t he com mand line interface. See Ch apte r 4, “Configuring VISM Feature s. ”

Note 1:1 redundancy using Y-cables is not supported by VISM.

Redundancy can also b e configured a t t he ATM permanent virtual c irc uit s ( PVC s) l evel. Two separate PVCs can be set up, each using a di fferent PXM physic al port and e ach rout ed to a separ ate route r. Configure one PVC as active and the o ther as standby. Both PVCs are monitored by heartbeat OAM F5 loopback cells every 200 ms. If three consecutive OAM cells are lost, the PVC fails, and only the remaining PVC is active. A PVC will recover automatically when five consecutive OAM cells are received while the PVC remains in standby mode (no automatic fallback to active state is provided).

Control and bearer PVCs can be set up with a redundant PVC.

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+ 634 hidden pages

Cisco VISM User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

CONTENTS

Objectives

Audience

Preface

Document Organization

Related Documentation

Cisco MGX 8850 (PXM45) Multiservice Switch Release 3

MGX 8850 (PXM1) Multiservice Switch Release 1.2.10

MGX 8250 Edge Concentrator Release 1.2.10

MGX 8230 Edge Concentrator Release 1.2.10

Conventions

Obtaining Documentation

Cisco.com

Ordering Documentation

Documentation Feedback

Obtaining Technical Assistance

Cisco TAC Website

Opening a TAC Case

Obtaining Additional Publications and Information

TAC Case Priority Definitions

Overview of the VISM and VISM-PR Cards

VISM and VISM-PR Card Types

VISM and VISM-PR Card Service Types

VISM and VISM-PR Card Physical Characteristics

VISM Card Architecture

VISM and VISM-PR Card Features

Redundancy and Bulk Distribution