Cisco MC3810-V - Concentrator - External, MC3810 Features Manual

Voice over ATM Switched Virtual Circuits on the Cisco MC3810

This document describes voice over Asynchronous Transfer Mode (VoATM) switched virtual circuits (SVCs) for the Cisco MC3810 multiservice access concentrator.

This document includes the following sections:

• Feature Overview, page 1

• Supported Platforms, page 4

• Supported Standards, MIBs, and RFCs, page 4

• Prerequisites, page 4

• Configuration Tasks, page 5

• Troubleshooting Voice over ATM SVCs, page 16

• Monitoring and Main taining Voice over ATM SVCs, page 19

• Configuration Examples, page 20

• Command Reference, page 22

• Glossary, page 30

Feature Overview

VoATM SVCs allow the Cisco MC3810 to transfer voice data dynamically and as needed—without tying up the resources required for static, manually provisioned permanent virtual circuits (PVCs). An SVC connection is initiated for each call, and each request includes bandwidth and quality-of-service (QoS) information required for the connection. SVCs are ideal for networks that are highly interconnected, where scalability is essential, and in situations where traffic is sporadic. In addition, service providers often offer more advantageous, usage-based pricing options for SVCs.

VoATM using SVCs on the Cisco MC3810 includes all of the voice features that the Cisco MC3810 supports for PVCs and for Frame Relay transport. Like other Cisco voice implementations, VoATM using SVCs is based on dial peers and uses ATM Adaptation Layer 5 (AAL5).

ATM SVC service operates much like X.25 SVC service, although ATM allows much higher throughput. It requires a signaling protocol between a router or a multiservice access concentrator and an ATM switch. The ATM signaling software provides a method of dynamically establishing, maintaining, and clearing A TM connections at the User -Network Interface (UNI). In UNI, the router serves as the user and the AT M switch is considered the network. The router does not perform call-level routing. Instead, the ATM switch does the A TM call routing, and the router directs pack ets through the resulting circuit.

Voice over ATM Switched Virtual Circuits on the Cisco MC3810 1

Feature Overview

Local office 1

VoATM SVCs include the following features:

• User-to-Network Interface (UNI) 3.1 signaling procedures, including support for the following

types of information elements:

— Traffic descriptor — Broadband bearer capability — ATM addressing information

• The implementation adheres to the required features of ATM Forum User-Network Interface

(UNI) signaling specification, version 4.0, simultaneously supporting permanent virtual circuits (PVCs) and SVCs.

• Network Service Access Point (NSAP) addressing for private networks

• Interim Local Management Interface (ILMI)

• 24 simultaneous voice calls per Cisco MC3810 system

• Support for tandem switching

Note The Cisco MC3810, in addition to supporting video and voice over A TM SVCs, also supports

data over ATM SVCs. Wide-Area Networking Configuration Guide and Wide-Area Networking Command Reference provide more information about the commands and configuration steps

required for this capability.

Figure 1 Application for Voice over ATM Using SVCs

FXS FXS FXS

FXO

Local office 2

FXS FXS FXS

Cisco

MC3810

T1 or E1

Cisco

T1 or E1

ATM PVC

& SVCs

PSTN

T1 or E1

Regional office

PBX

T1 or E1

Cisco

MC3810

22885

Cisco IOS Release 12.0(7)T

Benefits

The Cisco MC3810 multiservice access concentrator formerly supported only non-dial permanent virtual circuits (PVCs) for ATM traffic.

SVCs offer the following benefits:

• Dynamic resource allocation is more efficient and flexible than in nailed-up PVC connections.

• Many service providers offer favorable pricing for ATM SVC service.

• Interface requirements are determin ed by total bandwidth needs rather than by the number of

different remote connections.

• SVCs support flat network topologies where each endpoint is separated by one hop only , offering

the following advantages:

— Simplifies design and management challenges. — Impro ves voice quality because there is only one compression cycle—in contrast to sc hemes

where voice is compressed, decompressed, and compressed again.

— Reduces delays over designs with multiple hops.

Restrictions

The following features are not supported.

• Direct E.164 ATM addressing

• Available Bit Rate (ABR) service

• Leaf-initiated joins (LIJs)

• ATM an ycast, communication between one sender and the nearest of se veral recei v ers in a group

• Generic Identifier Transport (GIT), which uses an information element to carry identifiers

between two users

• Switched Virtual Path service, which is the grouping of SVCs to define a path (usually within a

single application) where the switch directs calls as appropriate

• Proxy signaling, where, for example, IP traffic is identified by class or precedence and an IP

router rather than the source host signals an ATM layer

Related Features and Technologies

The Cisco MC3810 also supports data over ATM SVCs. Wide-Area Networking Configuration Guide and Wide-Area Networking Command Reference provide more information about the

commands and configuration steps required for this capability.

Voice over ATM Switched Virtual Circuits on the Cisco MC3810 3

Related Documents

For information about Cisco IOS configuration for voice applications, consult the following Cisco IOS Release 12.0 documents:

• Voice, Video, and Home Applications Configuration Guide

• Voice, Video, and Home Applications Command Reference

For information about Cisco IOS configuration for ATM, consult the following Cisco IOS Release

12.0 documents:

• Wide-Area Networking Configuration Guide

• Wide-Area Networking Command Reference

For information about IOS configuration that is unique to the Cisco MC3810, consult the following Cisco documents:

• Cisco MC3810 Multiservice Access Concentrator Softwar e Configuration Guide

• Cisco MC3810 Multiservice Access Concentrator Software Command Reference

Supported Platforms

This feature is supported on the Cisco MC3810 multiservice access concentrator.

Supported Standards, MIBs, and RFCs

No MIBs are supported by this feature.

Other Standards

• ATM Forum document af-uni-0010.002, ATM User-Network Interface Specification V3.1

(1994), including support for the following types of information elements:

— Traffic Descriptor — Broadband Bearer Capability — ATM Addressing Information

• ATM F orum document af-sig-0061.000, A TM UNI Signaling Specif ication V4.0 (1996) with the

exceptions noted in “Restrictions” on page 3

• ITU recommendation Q.2931

• ITU-T X.213 and OSI Network Service Access Point (NSAP) addressing

• ATM Forum document af-ilmi-0065.0 00, Integrated Local Management Interface (1996)

Prerequisites

• Cisco IOS Software Release 12.0(5)XK or 12.0(7)T or a later release

• A configured ATM network

Cisco IOS Release 12.0(7)T

Configuring Network Clocks and Controller Settings

Configuration Tasks

Perform the following tasks to configure VoATM SVCs service:

• Set up clock sources, T1/E1 controller settings, and serial interfaces.

• Configure the ATM interface, including signaling and management PVCs.

• Set up voice POTS and ATM dial peers.

These tasks do not represent all of the configuration tasks required to set up your A TM network. F or more information, refer to the Cisco MC3810 Multiservice Access Concentrator Software Configuration Guide and to the examples shown in the “Configuration Examples” section on page 20.

Configuring Network Clocks and Controller Settings

Because voice communications require a continuous and tightly meshed data stream to avoid loss of information, and PSTNs provide a variety of clocks, you must synchronize source and destination devices to a single master clock. In the example that follows, the clock source is derived from a device attached to T1 controller 0; then the clock source is distributed to the de vices attached to the local Cisco MC3810 serial ports and to T1 controller 1. Base clock source decisions on the network configuration, and set up a hierarchy of clock sources, so that backup clock sources are available. For details, see Chapter 4, “Configuring Synchronized Clocking,” in Cisco MC3810 Multiservice

Access Concentrator Software Conf iguration Guide.

This configuration task also includes the basic steps required for ATM support over T1/E1 controller 0.

Step Command Purpose

Router# configure terminal

Router(config)# controller {T1 | E1} 0

Router(config-controller)# clock source line

Router(config-controller)# no shutdown

Router(config)# controller {T1 | E1} 1

Router(config-controller)# clock source internal

Router(config-controller)# no shutdown

Router(config-controller)# exit

Router(config)# framing esf

Router(config)# framing crc4

Enter global configuration mode. Enter controller configuration mode for controller

T1/E1 0. ATM traffic is supported on controller T1/E1 0 only.

Configure controller T1/E1 0 to obtain the Cisco MC3810 clock source from an attached network device. This is the default setting.

Activate the controller. Enter controller configuration mode for controller

T1/E1 1. Configure controller T1/E1 1 to obtain its clocking from

the internal network clock Phase-Lock-Loop (PLL). In this way, controller T1/E1 1 obtains clocking from the T1/E1 0 controller source—the switch.

Activate the controller. Exit controller configuration mode. Set the framing to Extended Superframe (ESF) format,

required for ATM on T1. This setting is automatic for T1 when the ATM mode is set.

Set the framing to CRC4, required for ATM on E1. This setting is automatic for E1 when the ATM mode is set.

Voice over ATM Switched Virtual Circuits on the Cisco MC3810 5

Verifying Network Clocks and Controller Settings

Step Command Purpose

Router(config)# linecode b8zs

Set the line coding to binary zero 0 substitution (B8ZS), required for ATM on T1. This setting is automatic for T1 when the ATM mode is set.

Router(config)# linecode hdb3

Set the line coding to HDB3, required for ATM on E1. This setting is automatic for E1 when the ATM mode is set.

Router(config)# mode atm

Configure the controller for ATM traffic. This allows the controller to support ATM encapsulation and create virtual ATM interface 0 for SVCs and PVCs. Controller framing is automatically set to extended super frame (ESF) on T1 and to CRC4 on E1. The line coding is automatically set to B8ZS on T1 and to HDB3 on E1. Channel groups, channel-associated signaling (CAS) groups, common channel signaling (CCS) groups or clear channels are not allowed on the trunk because ATM traffic occupies all the DS0s.

Router(config)# network-clock base rate {56k | 64k}

Set the network clock base-rate for the serial ports. The default is 56 kbps.

Note At this point, you can also configure network

protocol settings such as IP hosts. For more information, see the Cisco IOS Release 12.0 network protocol configuration and command reference guides.

Verifying Network Clocks and Controller Settings

T o v erify the configuration of network clock sources and controller settings, follow the steps below.

Step 1 Enter the privileged EXEC show network-clocks command to see the status of clock

source settings.

Router# show network-clocks

Priority 1 clock source(inactive config): T1 0 Priority 1 clock source(active config) : T1 0

Step 2 Enter the privileged EXEC show controllers t1 or sho w controllers e1 command to s ee

the status of T1/E1 controllers.

router# show controller t1 1 T1 1 is up. Applique type is Channelized T1 Cablelength is long gain36 0db No alarms detected. Slot 4 CSU Serial #07789650 Model TEB HWVersion 4.70 RX level = 0DB Framing is ESF, Line Code is B8ZS, Clock Source is Internal. Data in current interval (819 seconds elapsed): 0 Line Code Violations, 0 Path Code Violations 0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins 0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs Data in Interval 1: 0 Line Code Violations, 0 Path Code Violations 0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins 0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs Data in Interval 2: 0 Line Code Violations, 0 Path Code Violations 0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins 0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs

Cisco IOS Release 12.0(7)T

Configuring ATM Interfaces

. . . Data in Interval 96: 0 Line Code Violations, 0 Path Code Violations 0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins 0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs Total Data (last 24 hours) 0 Line Code Violations, 0 Path Code Violations, 0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins, 0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs

! Router# show controllers E1 1 E1 1 is up. Applique type is Channelized E1 - balanced No alarms detected. Slot 4 Serial #06868949 Model TEB HWVersion 3.80

Framing is CRC4, Line Code is HDB3, Clock Source is Internal.

Data in current interval (292 seconds elapsed): 0 Line Code Violations, 0 Path Code Violations 0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins 0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs . . . Total Data (last 66 15 minute intervals): 9 Line Code Violations, 0 Path Code Violations, 1 Slip Secs, 0 Fr Loss Secs, 4 Line Err Secs, 0 Degraded Mins, 5 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Se

Configuring ATM Interfaces

In this section, the ATM interface is set up, including PVCs to carry signaling for SVCs. In addition, an NSAP address for an ATM SVC is specified. For additional information, see Cisco MC3810

Multiservice Access Concentrator Software Configuration Guide and Cisco MC3810 Multiservice Access Concentrator Software Command Reference.

You can also configure PVCs for voice communications. Wide-Area Networking Configuration Guide and Wide-Area Networking Command Reference provide additional information about this

and other aspects of ATM configuration.

Step Command Purpose

Router# configure terminal

Router(config)# interface atm0

Router(config-if)# ip address ip-address mask

Enter global configuration mode. Enter interface configuration mode for ATM 0—the only

ATM interface that supports voice over SVCs. Assign the IP address and subnet mask to the interface.

Voice over ATM Switched Virtual Circuits on the Cisco MC3810 7

Configuring ATM Interfaces

Step Command Purpose

Router(config-if)# atm voice aesa {default |

esi-address}

This command sets the unique ATM end-station address (AESA) for an ATM interface that is using SVC mode for voice.

The default keyword automatically creates an NSAP address for the interface, based on a prefix from the ATM switch (26 hexadecimal characters), the MAC address (12 hexadecimal characters) as the ESI (end station id entifier), and a selector byte (two hexadecimal characters).

The esi-address option requires that you enter 12 hexadecimal characters as the ESI. The ATM switch provides the prefix and the v o ic e selector byte provides the remaining characters.

You can view the assigned address using the show atm video-voice address command.

Router(config-if)# pvc [name] vpi/vci ilmi

Create an ATM permanent virtual circuit (PVC) for ILMI management purposes and enter PVC configuration mode.

The optional name is a unique label that can be up to 16 characters long. name identifies to the processor the virtual path identifier-virtual channel identifier (VPI-VCI) pair to use for a particular packet.

The ATM network VPI of this PVC is an 8-bit field in the header of the ATM cell. The vpi v alue is unique only on a single link, not throughout the ATM network, because it has local significance only . The vpi value must match that of the switch. Valid values are from 0 to 255, but the value is usually 0 for ILMI communications. If not specified, the vpi value is set to 0.

You cannot set both vpi and vci to 0; if one is 0, the other cannot be 0.

For ILMI communications this value is typically 16. The VCI is a 16-bit field in the header of the ATM cell. The VCI value is unique only on a single link—not throughout the ATM network—because it has local significance only.

To set up communication with the ILMI, enter a value of ilmi for ATM adaptation layer encapsulation; the associated vpi and vci values are ordinarily 0 and 16, respectively.

Note Typically, the lo w values 0 to 31 are reserved for

specific traffic (for example, F4 OAM, SVC signaling, ILMI, and so on) and you should not use them for other PVCs.

Router(config-if-atm-pvc)# pvc [name] vpi/vci qsaal

See the explanations in Step 5 for the name, vpi, and vci values.

To enable the signaling for setup and tear-down of SVCs, specify the Q.SAAL (Signaling ATM Adaptation Layer) encapsulation; the associated vpi and vci values are ordinarily 0 and 5, respectively. You cannot create this PVC on a subinterface.

#Router(config-if-atm-pvc)# exit

Exit PVC interface configuration mode.

Cisco IOS Release 12.0(7)T

Step Command Purpose

Router(config-if)# interface atm 0 [.subinterface-number

{multipoint | point-to-point}]

Optionally, you can create and configure a subinterface. This is useful when you wish to configure an extra parameter on the ATM interface. For example, you can specify one IP address on the main interface, as shown in Step 3; then you can configure a second IP address on a subinterface.

subinterface-number is a value in the range from 1 to

4294967293. Enter the multipoint keyword when your netwo rk is fully

meshed and you want to communicate with multiple routers. The point-to-point keyword configures the subinterface for communication with one router, as in a hard-wired connection. There is no default for this parameter.

Verifying ATM Interface Configuration

To verify ATM interface configuration, follow the steps below:

Step 1 Enter the privileged EXEC show atm vc command to see how SVCs and PVCs are set

up, as in the following example:

Router# show atm vc VCD / Peak Avg/Min Burst Interface Name VPI VCI Type Encaps SC Kbps Kbps Cells Sts 0 1 0 5 PVC SAAL UBR 0 UP 0 2 0 16 PVC ILMI UBR 0 UP 0 379 0 60 SVC SNAP UBR 0 UP 0 986 0 84 SVC SNAP UBR 0 UP 0 14 0 133 SVC VOICE VBR 64 16 10 UP 0 15 0 134 SVC VOICE VBR 64 16 10 UP 0 16 0 135 SVC VOICE VBR 64 16 10 UP 0 17 0 136 SVC VOICE VBR 64 16 10 UP 0 18 0 137 SVC VOICE VBR 64 16 10 UP 0 19 0 138 SVC VOICE VBR 64 16 10 UP 0 20 0 139 SVC VOICE VBR 64 16 10 UP 0 21 0 140 SVC VOICE VBR 64 16 10 UP 0 22 0 141 SVC VOICE VBR 64 16 10 UP 0 23 0 142 SVC VOICE VBR 64 16 10 UP 0 24 0 143 SVC VOICE VBR 64 16 10 UP 0 25 0 144 SVC VOICE VBR 64 16 10 UP 0 26 0 145 SVC VOICE VBR 64 16 10 UP 0 27 0 146 SVC VOICE VBR 64 16 10 UP 0 28 0 147 SVC VOICE VBR 64 16 10 UP

Verifying ATM Interface Configuration

Step 2 Enter the show atm svc command with or without the VPI/VCI specified. The following

example shows information for a specific SVC:

Router# show atm svc 0/134

ATM0: VCD: 5, VPI: 0, VCI: 134 VBR, PeakRate: 64000 AAL5, etype: 0x0, Flags 0x440, VCmode: 0xE000 OAM frequency: 0 second(s), OAM retry frequency: 1 second(s) OAM up retry count: 3, OAM down retry count: 5 OAM Loopback status: OAM Disabled OAM VC state: Not Managed ILMI VC state: Not Managed InARP DISABLED

Voice over ATM Switched Virtual Circuits on the Cisco MC3810 9

Verifying ATM Interface Configuration

InPkts: 4, OutPkts: 4, InBytes: 432, OutBytes: 432 InPRoc: 4, OutPRoc: 4, Broadcasts: 0 InFast: 0, OutFast: 0, InAS: 0, OutAS: 0 OAM cells received: 0 F5 InEndloop: 0, F5 InSegloop: 0, F5 InAIS: 0, F5 InRDI:0 F4 InEndloop: 0, F4 InSegloop: 0, F4 InAIS: 0, F4 InRDI:0 OAM cells sent: 0 F5 OutEndloop: 0, F5 OutSegloop: 0, F5 OutRDI: 0 OAM cell drops: 0 Status: UP TTL: 3 interface = ATM0, call locally initiated, call reference = 5558610 vcnum = 5, vpi = 0, vci = 134, state = Active(U10), point-to-point call Retry count: Current = 0 timer currently inactive, timer value = 00:00:00 Remote Atm Nsap address:47.00918100000000400B0A2501.0060837B4743.00, VCowner:Static Map

Step 3 To see the PVCs that are set up for ILMI management and Q.SAAL signaling, enter the

show atm pvc command with the VPI/VCI specified, as in the following example:

Router# show atm pvc 0/5 ATM0: VCD: 2, VPI: 0, VCI: 5, Connection Name: SAAL UBR, PeakRate: 56 AAL5-SAAL, etype:0x4, Flags: 0x26, VCmode: 0x0 OAM frequency: 0 second(s), OAM retry frequency: 1 second(s), OAM retry frequenc y: 1 second(s) OAM up retry count: 3, OAM down retry count: 5 OAM Loopback status: OAM Disabled OAM VC state: Not Managed ILMI VC state: Not Managed InARP DISABLED InPkts: 2044, OutPkts: 2064, InBytes: 20412, OutBytes: 20580 InPRoc: 2044, OutPRoc: 2064, Broadcasts: 0 InFast: 0, OutFast: 0, InAS: 0, OutAS: 0 OAM cells received: 0 F5 InEndloop: 0, F5 InSegloop: 0, F5 InAIS: 0, F5 InRDI: 0 F4 InEndloop: 0, F4 InSegloop: 0, F4 InAIS: 0, F4 InRDI: 0 OAM cells sent: 0 F5 OutEndloop: 0, F5 OutSegloop: 0, F5 OutRDI: 0 F4 OutEndloop: 0, F4 OutSegloop: 0, F4 OutRDI: 0 OAM cell drops: 0 Compress: Disabled Status: INACTIVE, State: NOT_IN_SERVICE ! Router# show atm pvc 0/16 ATM0: VCD: 1, VPI: 0, VCI: 16, Connection Name: ILMI UBR, PeakRate: 56 AAL5-ILMI, etype:0x0, Flags: 0x27, VCmode: 0x0 OAM frequency: 0 second(s), OAM retry frequency: 1 second(s), OAM retry frequenc y: 1 second(s) OAM up retry count: 3, OAM down retry count: 5 OAM Loopback status: OAM Disabled OAM VC state: Not Managed ILMI VC state: Not Managed InARP DISABLED InPkts: 398, OutPkts: 421, InBytes: 30493, OutBytes: 27227 InPRoc: 398, OutPRoc: 421, Broadcasts: 0 InFast: 0, OutFast: 0, InAS: 0, OutAS: 0 OAM cells received: 0 F5 InEndloop: 0, F5 InSegloop: 0, F5 InAIS: 0, F5 InRDI: 0 F4 InEndloop: 0, F4 InSegloop: 0, F4 InAIS: 0, F4 InRDI: 0 OAM cells sent: 0 F5 OutEndloop: 0, F5 OutSegloop: 0, F5 OutRDI: 0 F4 OutEndloop: 0, F4 OutSegloop: 0, F4 OutRDI: 0

Cisco IOS Release 12.0(7)T

Verifying ATM Interface Configuration

OAM cell drops: 0 Compress: Disabled Status: INACTIVE, State: NOT_IN_SERVICE

Step 4 To view information about the ATM interface, enter the privileged EXEC show atm

interface command and specify ATM 0, as in the following example:

Router# show interface atm 0 ATM0 is up, line protocol is up Hardware is PQUICC Atom1 Internet address is 9.1.1.6/8 MTU 1500 bytes, sub MTU 1500, BW 1536 Kbit, DLY 20000 usec, reliability 255/255, txload 22/255, rxload 11/255 NSAP address: 47.0091810000000002F26D4901.000011116666.06

Encapsulation ATM

292553397 packets input, -386762809 bytes 164906758 packets output, 1937663833 bytes 0 OAM cells input, 0 OAM cells output, loopback not set Keepalive not supported Encapsulation(s):, PVC mode 1024 maximum active VCs, 28 current VCCs VC idle disconnect time: 300 seconds Signalling vc = 1, vpi = 0, vci = 5 UNI Version = 4.0, Link Side = user Last input 00:00:00, output 2d05h, output hang never Last clearing of "show interface" counters never Input queue: -1902/75/0 (size/max/drops); Total output drops: 205 Queueing strategy: weighted fair Output queue: 0/1000/64/0 (size/max total/threshold/drops) Conversations 0/0/256 (active/max active/max total) Reserved Conversations 0/0 (allocated/max allocated) 5 minute input rate 67000 bits/sec, 273 packets/sec 5 minute output rate 136000 bits/sec, 548 packets/sec 76766014 packets input, 936995443 bytes, 0 no buffer Received 0 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort 367264676 packets output, 3261882795 bytes, 0 underruns 0 output errors, 0 collisions, 2 interface resets 0 output buffer failures, 0 output buffers swapped out

Step 5 Enter the privileged EXEC show atm video-voice address command to see information

about the ATM interface address, which is particularly helpful because the address is assigned automatically with the atm voice aesa command. The following display also confirms that the ILMI status is confirmed—the ILMI PVC is set up to allow SVC management:

Router# show atm video-voice address nsap address type ilmi status

47.0091810000000002F26D4901.00107B4832E1.FE VOICE_AAL5 Confirmed

47.0091810000000002F26D4901.00107B4832E1.C8 VIDEO_AAL1 Confirmed

Voice over ATM Switched Virtual Circuits on the Cisco MC3810 11

Configuring Voice Ports and Voice Dial Peers

In this section, the voice ports and voice dial peers are set up to support the local and the remote parties.

Step Command Purpose

Router# configure terminal

Router(config)# voice-port port/slot

Router(config-voiceport) codec g726r32

or see Step 6.

Router(config-voiceport) exit

Router(config)# dial-peer voice tag voatm

Router(config-dialpeer)# fax rate 4800

Enter global configuration mode. Specify a voice port and enter voice-port configuration

mode. port specifies the slot number on the Cisco MC3810. If

the analog voice module (AVM) or the digital voice module (DVM) is installed, the slot number is 1. If the multiflex trunk (MFT) is installed, the slot number is 0.

slot specifies the voice port number. The valid entries depend on the hardware configuration, as follows:

• Analog: 1 to 6

• Digital T1: 1 to 24

• Digital E1: 1 to 15 and 17 to 31 (Fax only , Optional) If you are configuring a dial peer for

faxes over ATM SVCs, the default codec setting for the voice port does not function properly with the typical fax rate of 9.600 bps. Therefore, you can either change the codec or change the fax rate. The codec must support a minimum of 22 kbps.

To change the codec from the default g729ar8 codec (8 kbps), enter the voice-port codec command to specify one of the following compression modes:

• g726r32—Specifies G.726 32K ADCPM compression.

• g711alaw—Specifies G.711 64K PCM A-Law

compression.

• g711ulaw—Specifies G.711 64K PCM U-Law

compression. Exit voice-port configuration mode. Define a voice ATM dial peer for the remote system and

enter dial-peer configuration mode. Voice dial peers are persistent and exist until they are specifically removed with the no form of the dial-peer voice command.

The tag value identifies the dial peer and must be unique on the Cisco MC3810. Do not duplicate a specific tag number. Valid values are from 1 to 10000.

(Fax only , Optional) If you are configuring a dial peer for faxes over ATM SVCs, the default codec setting for the voice port does not function properly unless the fax rate is slowed from the typical speed of 9.600 bps. Therefore, you can either change the codec (see Step 3) or change the fax rate to 4,800 bps or 2,400 bps.

Cisco IOS Release 12.0(7)T

Step Command Purpose

Router(config-dialpeer)# destination-pattern string [T]

Configure the dial peer's destination pattern to allow the system to reconcile dialed digit s with the pee r’s NSAP address. The string is a series of digits that specify the E.164 or private dialing plan telephone number. Valid entries are the digits 0 through 9 and the letters A through D. The plus symbol (+) is not valid. You can enter the following special characters:

• The star character (*) and the pound sign (#) that

appear on standard touch-tone dial pads can appear in

any dial string but not as leading characters (for

example, *650).

• The period (.) acts as a wildcard character.

• Use the comma (,) only in prefixes to insert a

one-second pause.

• Use the timer (T) character to conf igure v a riable-length

dial plans.

Router(config-dialpeer)# session target ATM0 {svc nsap

address | pvc [vpi/vci | name]}

Configure the ATM session target for the dial peer. Specify ATM 0 as the interface.

When you use SVCs, the system reconciles dialed digits with the remote ATM interface’s voice NSAP address.

Note If you are using PVCs for voice, you can specify a

PVC defined on the ATM interface as a session target, by using a name or a VPI/VCI combination. For additional information, see Voice, Video, and Home Applications Configuration Guide for Cisco IOS Release 12.0.

Router(config-dialpeer)# exit

Exit dial-peer configuration mode for this particular dial peer.

Router(config)# dial-peer voice tag pots

Define a local voice ATM dial peer. The tag value identifies the dial peer and must be unique

on the Cisco MC3810. Do not duplicate a specific tag number. Valid values are from 1 to 10000.

Router(config-dialpeer)# destination-pattern string

Configure the dial peer's destination pattern. See Step 7 for more information.

Router(config-dialpeer)# port slot/port

Specify the voice port where the vo ic e equipment is connected.

Verifying Voice Ports and Voice Dial Peers

Step 1 To verify voice-port configuration, enter the privileged EXEC show voice port

command; you can either specify a voice port, or issue the command without arguments to display information about all voice ports. The following text shows example output:

Router# show voice port 1/1

Voice-port1/1 Slot is 1, Port is 1 Type of VoicePort is E&M Operation State is UP Administrative State is UP No Interface Down Failure Description is not set Noise Regeneration is enabled Non Linear Processing is enabled

Voice over ATM Switched Virtual Circuits on the Cisco MC3810 13

Verifying Voice Ports and Voice Dial Peers

Music On Hold Threshold is Set to -38 dBm In Gain is Set to 0 dB Out Attenuation is Set to 0 dB Echo Cancellation is enabled Echo Cancel Coverage is set to 8 ms Connection Mode is normal Connection Number is not set Initial Time Out is set to 10 s

Interdigit Time Out is set to 10 s Call-Disconnect Time Out is set to 0 s Coder Type is g729ar8 Companding Type is u-law Voice Activity Detection is disabled Ringing Time Out is 180 s Wait Release Time Out is 30 s

Nominal Playout Delay is 80 milliseconds Maximum Playout Delay is 160 milliseconds Rx A bit no conditioning set Rx B bit no conditioning set Rx C bit no conditioning set Rx D bit no conditioning set Tx A bit no conditioning set Tx B bit no conditioning set Tx C bit no conditioning set Tx D bit no conditioning set Tx Busyout ABCD bits = 1010 Default pattern Rx Seize ABCD bits = 1111 Default pattern Rx Idle ABCD bits = 0000 Default pattern Tx Seize ABCD bits = 1111 Default pattern Tx Idle ABCD bits = 0000 Default pattern Ignored Rx ABCD bits = BCD Region Tone is set for US

Analog Info Follows: Currently processing Voice Maintenance Mode Set to None (not in mtc mode) Number of signaling protocol errors are 0 Impedance is set to 600r Ohm

Voice card specific Info Follows: Signal Type is immediate Operation Type is 2-wire

E&M Type is 1

Dial Type is dtmf In Seizure is active Out Seizure is active Digit Duration Timing is set to 100 ms InterDigit Duration Timing is set to 100 ms

Pulse Rate Timing is set to 10 pulses/second InterDigit Pulse Duration Timing is set to 500 ms Clear Wait Duration Timing is set to 400 ms Wink Wait Duration Timing is set to 200 ms Wink Duration Timing is set to 200 ms Delay Start Timing is set to 150 ms Delay Duration Timing is set to 140 ms Dial Pulse Min. Delay is set to 140 ms

Auto Cut-through is disabled Percent Break of Pulse is 61 percent Dialout Delay for immediate start is 300 ms

Cisco IOS Release 12.0(7)T

Verifying Voice Ports and Voice Dial Peers

Step 2 T o verify v oice dial-peer conf iguration, enter the pri vileged EXEC show dial-peer voice

command. The following text is sample output from the show dial-peer voice command:

Router# show dial-peer voice

VoiceEncapPeer1 tag = 1, destination-pattern = ‘4002’,preference = 0, Admin state is up, Operation state is up type = pots, prefix = ‘’, fwd-digits = 0, session-target = ‘’, voice-port = 1/1 VoiceOverATMPeer2 tag = 2, destination-pattern = ‘4001’,preference = 0, Admin state is up, Operation state is up type = voatm, session-target = ’ATM0’

nsap ’47.0091810000000050E201B101.00107B09C6ED.FE’,

VoiceEncapPeer3 tag = 3, destination-pattern = ‘4003’,preference = 0, Admin state is up, Operation state is up type = pots, prefix = ‘’, fwd-digits = 0, session-target = ‘’, voice-port = 1/1

Step 3 You can also enter a dial-plan number in order to learn more about a voice dial peer with

the show dialplan number dial string command, as shown in the following example:

router# show dialplan number 5558809 Macro Exp.: 3388809

VoiceEncapPeer9 information type = voice,

tag = 9, destination-pattern = ‘5558809’,

answer-address = ‘’, preference=0, group = 9, Admin state is up, Operation state is up, incoming called-number = ‘’, connections/maximum = 0/unlimited, application associated: type = pots, prefix = ‘’, session-target = ‘’, voice-port = ‘1/9’, direct-inward-dial = disabled, register E.164 number with GK = TRUE Connect Time = 0, Charged Units = 0, Successful Calls = 0, Failed Calls = 0, Accepted Calls = 0, Refused Calls = 0, Last Disconnect Cause is "", Last Disconnect Text is "", Last Setup Time = 0. Matched: 5558809 Digits: 7 Target:

Voice over ATM Switched Virtual Circuits on the Cisco MC3810 15

Troubleshooting Voice over ATM SVCs

When problems occur with voice over ATM SVCs, follow the steps below to look first for simpler problems before progressing to more complex possible issues. For general information about troubleshooting and voice QoS, see Cisco IOS Release 12.0 Voice, Video, and Home Applications Configuration Guide. Please see if any additional steps should be mentioned here.

Step 1 Make sure that the ATM interface, serial ports, and controllers are set to no shutdown. Step 2 On both Cisco MC3810 multiservice access concentrators, make sure that ILMI and

Q.SAAL PVCs are set up in order to allow SVC communications. The privileged EXEC show atm pvc command displays information about configured PVCs, including the ILMI and Q.SAAL PVCs.

Router# show atm pvc VCD / Peak Avg/Min Burst Interface Name VPI VCI Type Encaps SC Kbps Kbps Cells Sts 0 1 0 5 PVC SAAL UBR 56 UP 0 2 0 16 PVC ILMI UBR 56 UP

Step 3 Ensure that NSAP addresses are set up and confirmed as operational under the ATM

interfaces of the Cisco MC3810 multiservice access concentrators on both sides of the communication. Enter the privileged EXEC show atm video-voice address or show atm ilmi-status command, which are illustrated below . show atm ilmi-status provides more details about the ILMI PVC than does show atm video-voice address:

router# show atm video-voice address nsap address type ilmi status

47.0091810000000002F26D4901.00107B4832E1.FE VOICE_AAL5 Confirmed

router# show atm ilmi-status

Interface : ATM0 Interface Type : Private UNI (User-side) ILMI VCC : (0, 16) ILMI Keepalive : Enabled (5 Sec 4 Retries) ILMI State: UpAndNormal Peer IP Addr: 10.1.1.11 Peer IF Name: ATM1/0/0 Peer MaxVPIbits: 8 Peer MaxVCIbits: 14 Active Prefix(s) :

47.0091.8100.0000.0002.f26d.4901

End-System Registered Address(s) :

47.0091.8100.0000.0002.f26d.4901.0000.1111.5555.05(Confirmed)

47.0091.8100.0000.0002.f26d.4901.0010.7b48.32e1.fe(Confirmed)

47.0091.8100.0000.0002.f26d.4901.0010.7b48.32e1.c8(Confirmed)

Step 4 Check the voice ports for busyout status by is suing the show voice b usyout command. If

the busyout-monitor interface or busyout forced command has been issued, one or more voice ports may be busied out, either due to a serial interface failure or because the voice port has been forced into a busyout state.

router# show voice busyout If following network interfaces are down, voice port will be put into busyout state Serial0 The following voice ports are in busyout state 1/10

Enter show interfaces serial to check the specified serial interface, or enter show voice port to check the voice-port status. The no form of the busy out forced command restores

the voice port.

Cisco IOS Release 12.0(7)T

Verifying Voice Ports and Voice Dial Peers

Step 5 Check for clocking problems. Enter the privileged EXEC command show controllers t1

or show controllers e1 command to check for slip errors, as shown in the following excerpt from the command output:

. . . Data in current interval (819 seconds elapsed): 0 Line Code Violations, 0 Path Code Violations 0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins 0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs Data in Interval 1: 0 Line Code Violations, 0 Path Code Violations 0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins 0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs Data in Interval 2: 0 Line Code Violations, 0 Path Code Violations 0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins 0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs Data in Interval 3: 0 Line Code Violations, 0 Path Code Violations 0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins 0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs . . .

A few slip errors may not indicate a problem with clocking. However, if there are numerous errors, especially incrementing numbers of errors, you should check the following possibilities:

— The network clocks are not set to the same clock rate. Enter the show

network-clocks command on the devices to ensure that these clock rates match.

— The Cisco MC3810 multiservice access concentrators may not be using the same

clock source. For example, if there are two back-to-back Cisco MC3810 multiservice access concentrators and one is using an internal clock source, the other must use the line clock source in order to obtain clocking from the same device. Enter the privileged EXEC commands show network-clocks and show controllers t1 or show controllers e1 to see the clock source settings. For additional guidance, see Chapter 4, “Configuring Synchronized Clocking,” in

Cisco MC3810 Multiservice Access Concentrator Software Configuration Guide .

Step 6 Check the functionality of the Service-Specific Connection-Oriented Protocol (SSCOP).

Enter the privileged EXEC show sscop command. See the following excerpt from the command output:

router# show sscop SSCOP details for interface ATM0 Current State = Data Transfer Ready

Interpretation of the command output requires familiarity with SSCOP, so unless you understand the protocol, just use the command to ensure that the protocol is in a state of readiness, as shown above. If you need to make changes, see the Cisco IOS Release 12.0 documents, Wide-Area Networking Configuration Guide and Wide-Area Networking Command Reference.

Note If you plan to adjust SSCOP parameters, you may wish to complete the rest of the

troubleshooting steps before taking this route.

Voice over ATM Switched Virtual Circuits on the Cisco MC3810 17

Troubleshooting Voice over ATM SVCs

Step 7 Enter the show dial-peer voice command on the local and remote concentrators to verify

that each has been configured properly to communicate with the other, as shown in the following example:

Router1# show dial-peer voice VoiceEncapPeer33 tag = 1, destination-pattern = ‘5558810’,preference = 0, Admin state is up, Operation state is up type = pots, prefix = ‘’, fwd-digits = 0, session-target = ‘’, voice-port = 1/1 VoiceOverATMPeer333 tag = 2, destination-pattern = ‘559...’,preference = 0, Admin state is up, Operation state is up type = voatm, session-target = ’ATM0’ nsap ’47.0091810000000002F26D4901.567856785678.56’,

Router2# show dial-peer voice VoiceEncapPeer44 tag = 20, destination-pattern = ‘5559810’,preference = 0, Admin state is up, Operation state is up type = pots, prefix = ‘’, fwd-digits = 0, session-target = ‘’, voice-port = 1/1 VoiceOverATMPeer444 tag = 10, destination-pattern = ‘5558...’,preference = 0, Admin state is up, Operation state is up type = voatm, session-target = ’ATM0’ nsap ’47.0091810000000002F26D4901.100110011001.01’,

Step 8 Enter the privileged EXEC show call history voice record command to s ee information

about current and recent voice calls, allowing analysis of possible problems:

router# show call history voice record ConnectionId=[0x9CE20881 0x224855C1 0x0 0x1C9B84C7] Media=TELE, TxDuration= 301962 ms CallingNumber=6668808 SetupTime=47995411 x 10ms ConnectTime=47995671 x 10ms DisconectTime=48025867 x 10ms

DisconnectText=local onhook

ConnectionId=[0x9CE20881 0x224855C1 0x0 0x1C9B84C7] Media=ATM, LowerIfName=ATM0, VPI=0, VCI=299 CalledNumber=5559808 SetupTime=47995483 x 10ms ConnectTime=47995671 x 10ms DisconectTime=48025867 x 10ms

DisconnectText=remote onhook

ConnectionId=[0x9CE20881 0x224855C2 0x0 0x1C9B84CB] Media=TELE, TxDuration= 301950 ms CallingNumber=5558803 SetupTime=47995412 x 10ms ConnectTime=47995682 x 10ms DisconectTime=48025877 x 10ms DisconnectText=local onhook

Cisco IOS Release 12.0(7)T

Verifying Voice Ports and Voice Dial Peers

Monitoring and Maintaining Voice over ATM SVCs

Command Purpose

Router# show network-clocks

Router# show controllers t1/e1

Router# show interfaces serial

Router# show atm vc

Router# show interface atm0

Router# show controllers atm

Router# show atm video-voice address

Router# show atm ilmi-status

Router# show sscop

Router# show voice busyout

Router# show voice port

Router# show voice dial-peer

Router# show call history voice record

Displays clock settings. Displays information about controller configuration and

errors. Displays information about serial interface configuration

and shows whether serial ports are operational. Displays information about all configured PVCs and

SVCs. Displays information about ATM interface configuration. Displays ATM controller information, including queue,

memory, and buffer statistics. Displays NSAP addresses configured on the ATM

interface along with their status. Displays detailed information about the ILMI PVC and

functions. Displays technical information about SSCOP status and

readiness. Displays information about voice ports that may be busied

out. Displays information about configured voice ports. Displays information about configured voice dial peers. Displays detailed information about calls in progress and

recent calls.

Voice over ATM Switched Virtual Circuits on the Cisco MC3810 19

Configuration Examples

This example shows the configurations of two Cisco MC3810 multiservice access concentrators that each have voice dial peers connecting over ATM SVCs. For additional information, see the Cisco

MC3810 Multiservice Access Concentrator Software Configuration Guide and the Cisco MC3810 Multiservice Access Concentrator Software Command Reference.

Figure 2 Sample Configuration: Two Cisco MC3810s using ATM SVCs for Voice

isco MC3810 Cisco MC3810

Initially, the network clocks are set up on MC3810A and MC3810B.

ATM

22887

hostname MC3810A ! network-clock base-rate 64k ip subnet-zero ip wccp version 2 ip host keyer-ultra 223.255.254.254 ! appletalk routing ipx routing 1111.0045.0005

hostname MC3810B ! network-clock base-rate 64k ip subnet-zero ip wccp version 2 ip host keyer-ultra 223.255.254.254 ! appletalk routing ipx routing 1111.0045.0002

The following configuration sets the T1 0 controllers, which are for ATM service. ESF framing and B8ZS are required for ATM. The default clock source is line, and the default for the T1 1 controller automatically becomes internal.

controller T1 0 framing esf linecode b8zs mode atm

The following configuration shows how the T1 1 controllers are set up for channel-associated signaling (CAS) through the mode cas command. A voice group is created on each controller to specify all of the DS0s for CAS and to set up E&M immediate-start signaling for the voice ports.

controller T1 1 framing esf clock source internal linecode b8zs mode cas voice-group 1 timeslots 1-24 type e&m-immediate-start

The following commands show how to configure the ATM interface and set up PVCs to supply Q.SAAL signaling and ILMI management for SVC communications. Note that you can also specify the voice NSAP address by using the atm voice aesa command with an ESI value.

interface ATM0 ip address 9.1.1.5 255.0.0.0 no ip directed-broadcast no ip route-cache atm pvc 1 0 5 qsaal atm pvc 2 0 16 ilmi atm ilmi-keepalive atm voice aesa default

Cisco IOS Release 12.0(7)T

interface ATM0 ip address 9.1.1.6 255.0.0.0 no ip directed-broadcast no ip route-cache atm pvc 1 0 5 qsaal atm pvc 2 0 16 ilmi atm ilmi-keepalive atm voice aesa default

Verifying Voice Ports and Voice Dial Peers

The following commands specify the voice ports corresponding to the DS0s. Not all are shown.

voice-port 1/1 ! voice-port 1/2 ! voice-port 1/3 timeouts call-disconnect 0 ! . . . voice-port 1/24

voice-port 1/1 ! voice-port 1/2 ! voice-port 1/3 ! . . . voice-port 1/24

The following commands specify the local voice dial peers (all 24 are not sho wn) and the ATM dial peers.

. . . dial-peer voice 2 pots destination-pattern 5558802 port 1/2 ! dial-peer voice 3 pots destination-pattern 5558803 port 1/3 ! dial-peer voice 4 pots destination-pattern 5558804 port 1/4 ! dial-peer voice 5 pots destination-pattern 5558805 port 1/5 . . . dial-peer voice 102 voatm destination-pattern 5559... session target ATM0 svc nsap

47.0091810000000002F26D4901.00107B09C645.FE

. . . dial-peer voice 2 pots destination-pattern 5559802 port 1/2 ! dial-peer voice 3 pots destination-pattern 5559803 port 1/3 ! dial-peer voice 4 pots destination-pattern 5559804 port 1/4 ! dial-peer voice 5 pots destination-pattern 5559805 port 1/5 . . . dial-peer voice 202 voatm destination-pattern 5558... session target ATM0 svc nsap

47.0091810000000002F26D4901.00107B4832E1.FE

Voice over ATM Switched Virtual Circuits on the Cisco MC3810 21

Command Reference

This section documents new or modified commands. All other commands used with this feature are documented in the Cisco IOS Release 12.0 command reference publications.

• atm scramble-enable

• atm voice aesa

• serial restart-delay

• session target

• show atm video-voice address

In Cisco IOS Release 12.0(1)T or later, you can search and filter the output for show and more commands. This functionality is useful when you need to sort through large amounts of output, or if you want to exclude output that you do not need to see.

To use this functionality, enter a show or more command followed by the “pipe” character (|), one of the keywords begin, include, or exclude, and an expression that you want to search or filter on:

command | {begin | include | exclude} regular-expression

Following is an example of the show atm vc command in which you want the command output to begin with the first line where the expression “PeakRate” appears:

show atm vc | begin PeakRate

For more information on the search and filter functionality, refer to the Cisco IOS Release 12.0(1)T feature module titled CLI String Search.

Cisco IOS Release 12.0(7)T

atm scramble-enable

Scrambling improves data reliability on E1links by randomizing the ATM cell payload frames to avoid continuous non-variable bit patterns and improve the efficiency of ATM’s cell delineation algorithms. The no form disables scrambling.

atm scramble-enable no atm scramble-enable

Syntax Description

This command has no arguments or keywords.

Defaults

By default, payload scrambling is off.

Command Mode

Interface configuration

atm scramble-enable

Command History

Usage Guidelines

Example

Release Modification

12.0(5)XK and 12.0(7)T This command was introduced for ATM interface configuration on the Cisco MC3810.

Enable scrambling on E1 links only. On T1 links, the default B8ZS line encoding normally ensures sufficient reliability.

The scrambling setting must match that of the far end.

On a Cisco MC3810, the following example shows how to set the ATM0 E1 link to scramble payload:

interface atm0 atm scramble-enable

Voice over ATM Switched Virtual Circuits on the Cisco MC3810 23

atm voice aesa

Enter the atm voice aesa ATM interface configuration command to set the unique A TM end-station address (AESA) for an ATM voice interface using SVC mode. The no form of this command removes any configured address for the interface.

atm voice aesa [default | esi-address] no atm voice aesa

Syntax Description

default The default keyword automatically creates an NSAP address for the

esi-address Enter 12 hexadecimal characters as the end-station identifier (ESI). The

interface, based on a prefix from the ATM switch (26 hexadecimal characters), the MAC address (12 hexadecimal characters) as the ESI (end station identifier), and a selector byte (two hexadecimal characters).

ATM switch provides the prefix (26 hexadecimal characters) and the voice selector byte provides the remaining two hexadecimal characters.

Defaults

Command Mode

Command History

Usage Guidelines

Examples

The default keyword is the default.

Interface configuration

Release Modification

12.0(5)XK and 12.0(7)T This command was introduced for ATM interface configuration on the Cisco MC3810.

You cannot specify the ATM interface NSAP address in its entirety . The system creates either all of it or part of it, depending upon how you use this command.

On a Cisco MC3810, the following example shows the ATM interface NSAP address set automatically:

interface atm0 atm video aesa default

On a Cisco MC3810, the following example shows the ATM interface NSAP address set to a specific ESI value:

interface atm0/1 atm video aesa 444444444444

Cisco IOS Release 12.0(7)T

Related Command

atm voice aesa

Command Description

show atm video-voice address Allows you to review the address assigned to an ATM interface.

Voice over ATM Switched Virtual Circuits on the Cisco MC3810 25

serial restart-delay

To set the amount of time that the router waits before trying to bring up a serial interface when it goes down, enter the serial restart-delay interface configuration command. The no form of the command set the delay to the default.

serial restart-delay count no serial restart-delay

Syntax Description

count count is a value from 0 to 900 in seconds. This is the frequency at which

Default

The default value is 0.

Command Mode

Interface configuration

the hardware is reset.

Command History

Usage Guidelines

Example

Related Commands

Release Modification

12.0(5)XK and 12.0(7)T This command was introduced for serial interface configuration on the Cisco MC3810.

The router resets the hardware each time the serial restart timer expires. This command is often used with the dial backup feature and with the pulse-time command, which sets the amount of time to wait before redialing when a DTR dialed device fails to connect.

When the count value is set to 0, the hardware is not reset when it goes down. In this way, if the interface is used to answer a call, it does not cause DTR to drop, which might cause communications device to disconnect.

On Cisco MC3810 interface Serial 0, this example shows the restart delay set to 1 second:

interface Serial0 serial restart-delay 1

Command Description

pulse-time seconds Enables pulsing DTR signal intervals on the serial interfaces. show interface serial Displays details serial interface configuration.

Cisco IOS Release 12.0(7)T

session target

T o conf igur e an ATM network-specific address for a permanent virtual connection (PVC) or switch virtual connection (SVC) dial peer, enter the ATM form of the session target dial-peer conf iguration command. The no form of the command disables the feature.

session target atm interface {svc nsap nsap-address | pvc {name | vpi/vci | vci} no session target

Syntax Description

interface Specifies the ATM interface number on the Cisco MC3810. The only valid

nsap-address For SVC communications, a 40-digit hexadecimal number for the session

name The name of the session target ATM PVC vpi/vci The ATM network virtual path identifier (VPI) and virtual channel

vci The ATM network virtual channel identifier (VCI) of this PVC

session target

number is 0.

target network service access point (NSAP) address

identifier (VCI) of this PVC

Default

Command Mode

Command History

Usage Guidelines

Enabled with no IP address or domain name defined.

Dial-peer configuration

Release Modification

11.3(1) T This command was introduced.

11.3(1) MA Support was added for VoFR, VoATM, and VoHDLC dial peers on the Cisco MC3810.

12.0(3)XG and 12.0(4)T The cid option was added for Frame Relay dial peers.

12.0(5)XK and 12.0(7)T Support was added for voice and video ATM SVCs on the Cisco MC3810.

Enter the ATM-specific version of this command to specify an ATM PVC or SVC for voice or video communications.

With SVCs and a dial map, dialed digits are reconciled with the remote ATM interface’ s voice NSAP address,

Voice over ATM Switched Virtual Circuits on the Cisco MC3810 27

session target

Example

Related Commands

The following example shows ho w an ATM voice dial peer is configured for SVC communications:

dial-peer voice 10 voatm destination-pattern 555 session target ATM0 svc nsap 47.0091810000000002F26D4901.444444444444.01

Command Description

dial-peer voice Sets up a voice dial peer for a local or remote dial peer. show dial-peer voice Displays details about configured voice dial peers.

Cisco IOS Release 12.0(7)T

show atm video-voice address

To display the network service access point (NSAP) address for the ATM interface, enter the show atm video-voice address privileged EXEC command.

show atm video-voice addres s

Syntax Description

There are no keywords or arguments.

Default

No default behavior or values

Command History

Release Modification

12.0(5)XK and 12.0(7)T This command was introduced for the Cisco MC3810.

show atm video-voice address

Usage Guidelines

Example

Enter this command to review ATM interface NSAP addresses that have been assigned using the atm video aesa or atm voice aesa command and to insure that ATM management is confirmed for those

addresses.

On a Cisco MC3810, the following example shows how to see information about ATM interface NSAP addresses:

router# show atm video-voice address nsap address type ilmi status

47.0091810000000002F26D4901.00107B4832E1.FE VOICE_AAL5 Confirmed

47.0091810000000002F26D4901.00107B4832E1.C8 VIDEO_AAL1 Confirmed

Table 1 describes the fields in the command output.

Table 1 show atm video-voice address Fields

Field Description

ilmi status Indicates whether an ILMI PVC is set

up and operational to manage SVC

communications. nsap address ATM interface NSAP address. type Interface ATM encapsulation type.

Related Command

Command Description

show atm ilmi-status Provides details about the status of ILMI management.

Voice over ATM Switched Virtual Circuits on the Cisco MC3810 29

Glossary

AAL—ATM Adaptation Layer. Service-dependent sublayer of the data link layer. The AAL accepts data from different applications and presents it to the ATM layer in the form of 48-byte ATM payload segments. AALs consist of two sublayers: convergence sublayer (CS) and segmentation and reassembly (SAR). AALs differ on the basis of the source-destination timing used, whether they use constant bit rate (CBR) or variable bit rate (VBR), and whether they are used for connection-oriented or connectionless mode data transfer. At present, the four types of AAL recommended by the ITU-T are AAL1, AAL2, AAL3/4, and AAL5.

AAL1—ATM adaptation layer 1. One of four AALs recommended by the ITU-T. AAL1 is used for connection-oriented, delay-sensitive services requiring constant bit rates, such as uncompressed video and other isochronous traffic.

AAL5—ATM adaptation layer 5. One of four AALs recommended by the ITU-T. AAL5 supports connection-oriented VBR services and is used predominantly for the transfer of classical IP over ATM and LANE traffic. AAL5 uses simple and efficient AAL (SEAL) and is the least complex of the current AAL recommendations. It offers low bandwidth overhead and simpler processing requirements in exchange for reduced bandwidth capacity and error-recovery capability.

ABR—available bit rate. QoS class defined by the ATM Forum for ATM networks. ABR is used for connections that do not require timing relationships between source and destination. ABR provides no guarantees in terms of cell loss or delay, providing only best-effort service. T raf fic sources adjust their transmission rate in response to information they receive describing the status of the network and its capability to successfully deliver data.

AESA—ATM End System Address ATM—Asynchronous Transfer Mode. International standard for cell relay in which multiple service

types (such as voice, video, or data) are conveyed in f ix ed-length (53-byte) cells. Fixed-length cells allow cell processing to occur in hardware, thereby reducing transit delays. ATM is designed to take advantage of high-speed transmission media such as E3, SONET, and T3.

CAS—channel-associated signaling CBR—constant bit rate. QoS class defined by the ATM Forum for ATM networks. CBR is used for

connections that depend on precise clocking to ensure undistorted delivery.

CCS—common-channel signaling CES—circuit emulation service. Enables users to multiplex or concentrate multiple circuit

emulation streams for voice and video with packet data on a single high-speed ATM link without a separate ATM access multiplexer.

E1—European digital carrier facility used for transmitting data through the telephone hierarchy. The transmission rate for E1 is 2.048 megabits per second (Mbps).

E3—Wide-area digital transmission scheme used predominantly in Europe that carries data at a rate of 34.368 Mbps. E3 lines can be leased for private use from common carriers.

ESI—end station identifier ILMI—Interim Local Management Interface. Specification developed by the ATM Forum for

incorporating network-management capabilities into the ATM User-Network Interface (UNI). ISDN—Integrated Services Digital Network. Communication protocol, offered by telephone

companies, that permits telephone networks to carry data, voice, and other source traffic.

NM—Network module POTS—Plain Old Telephone Service. Basic telephone service supplying standard single-line

telephones, telephone lines, and access to the public switched telephone network.

Cisco IOS Release 12.0(7)T

show atm video-voice address

PVC—permanent virtual circuit. Virtual circuit that is permanently established. PVCs save bandwidth associated with circuit establishment and tear down in situations where certain virtual circuits must exist all the time. In ATM terminology, called a permanent virtual connection.

QoS—quality of service. Measure of performance for a transmission system that reflects its transmission quality and service availability.

SAR—segmentation and reassembly . One of the two sublayers of the AAL CPCS, responsible for dividing (at the source) and reassembling (at the destination) the PDUs passed from the CS. The SAR sublayer takes the PDUs processed by the CS and, after dividing them into 48-byte pieces of payload data, passes them to the ATM layer for further processing.

SONET—Synchronous Optical Network. High-speed (up to 2.5 Gbps) synchronous network specification developed by Bellcore and designed to run on optical fiber . STS-1 is the basic building block of SONET.

SSCS—service specific conv er gence sublayer. One of the two sublayers of any AAL. SSCS, which is service dependent, offers assured data transmission. The SSCS can be null as well, in classical IP over ATM or LAN emulation implementations.

SVC—switched virtual circuit. Virtual circuit that is dynamically established on demand and is torn down when transmission is complete. SVCs are used in situations where data transmission is sporadic. Called a switched virtual connection in ATM terminology.

T3—Digital WAN carrier facility. T3 transmits DS-3-formatted data at 44.736 Mbps through the telephone switching network.

UBR—unspecified bit rate. Quality of Service (QoS) class defined by the ATM Forum for ATM networks. UBR allows any amount of data up to a specified maximum to be sent across the network, but there are no guarantees in terms of cell loss rate and delay.

UNI—User-Network Interface. ATM Forum specification that defines an interoperability standard for the interface between ATM-based products (a router or an AT M switch) located in a private network and the ATM switches located within the public carrier networks. Also used to describe similar connections in Frame Relay networks.

VBR—variable bit rate. QoS class defined by the ATM Forum for ATM networks. VBR is subdivided into a real time (RT) class and non-real time (NRT) class. VBR (RT) is used for connections in which there is a fixed timing relationship between samples. VBR (NRT) is used for connections in which there is no fixed timing relationship between samples, but that still need a guaranteed QoS.

VC—virtual circuit. Logical circuit created to ensure reliable communication between two network devices. A virtual circuit is defined by a VPI/VCI pair, and can be either permanent (PVC) or switched (SVC). Virtual circuits are used in Frame Relay and X.25. In ATM, a virtual circuit is called a virtual channel.

VCI—virtual channel identifier. 16-bit field in the header of an ATM cell. The VCI, together with the virtual path identifier (VPI), is used to identify the next destination of a cell as it passes through a series of ATM switches on its way to its destination. ATM switches use the VPI/VCI fields to identify the next network virtual channel link (VCL) that a cell needs to transit on its way to its final destination.

VCL—virtual channel link. Connection between two ATM devices. A VCC is made up of one or more VCLs.

VPI—virtual path identifier. 8-bit field in the header of an ATM cell. The VPI, together with the VCI, is used to identify the next destination of a cell as it passes through a series of ATM switches on its way to its destination. ATM switches use the VPI/VCI fields to identify the next VCL that a cell needs to transit on its way to its final destination.

Voice over ATM Switched Virtual Circuits on the Cisco MC3810 31

Cisco MC3810-V - Concentrator - External, MC3810 Features Manual

Specifications and Main Features

Frequently Asked Questions

User Manual