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Table of Contents
DS3 Node Line CardFeature Overview
Supported Platforms
Supported Standards, MIBs, and RFCs
Configuration Tasks
Setting the Maximum VPI/VCI Bits
Setting the Framing Mode
Setting the Scrambling Mode
Configuring the Clock Source
Setting the Line Buildout
Setting the Auto-FERF Alarms
Troubleshooting Tips
Configuration Examples
Command Reference
auto-ferf
clock source
framing
lbo
Glossary
DS3 Node Line Card
Feature Overview
The DS3 node line card (NLC) is a component module for the Cisco 6400 Universal Access Concentrator. Each DS3 NLC supports two ATM interfaces for connection to network services.
This document describes the software and features associated with the DS3 NLC. For hardware installation instructions, refer to the Cisco 6400 UAC Hardware Installation guide and the Cisco 6400 UAC FRU Installation and Replacement document.
Figure 1 DS3 Node Line Card
Benefits
Online Insertion and Removal
The DS3 NLC, like all components of the Cisco 6400, supports online insertion and removal. You can install a DS3 NLC in the Cisco 6400 chassis without having to power down the system. Similarly, a DS3 NLC can be removed without interrupting the operation of other components of the Cisco 6400.
Port Adapter Clocking Options
Each port on the DS3 NLC can be configured to support the following clocking options:
Traffic Pacing
Traffic pacing allows you to set the aggregate output traffic rate on any port to a rate below the line rate. This feature is useful when communicating with a slow receiver or when connected to public networks with peak-rate tariffs.
Supported Platforms
The DS3 NLC is supported on the Cisco 6400.
Supported Standards, MIBs, and RFCs
MIBs
RFCs
Standards
Configuration Tasks
Perform the following tasks to configure the DS3 NLC interface values. These tasks are optional, and are used to change the default configuration values.
Table 1 lists the default values initially assigned to all DS3 interfaces.
Configuring the ATM UNI Interface
To configure the ATM user to network interface (UNI), use the following command in interface configuration mode:
Setting the Maximum VPI/VCI Bits
To set the maximum size of the VPI and VCI fields, use the following commands in interface configuration mode:
| Command | Purpose |
|---|---|
Setting the Framing Mode
To set the DS3 framing mode, use the following command in interface configuration mode:
Setting the Scrambling Mode
To set the DS3 scrambling mode, use the following command in interface configuration mode:
Configuring the Clock Source
To configure the clock source for a DS3 interface, use the following commands, starting in global configuration mode:
| Command | Purpose |
|---|---|
|
Configure the network-derived clock. Use this command when setting the clock source to network-derived. |
|
Setting the Line Buildout
To select the line buildout for the DS3 NLC, use the following commands in interface configuration mode:
Setting the Auto-FERF Alarms
To set the automatic far-end receive failure (FERF) alarms on the DS3 NLC, use the following commands in interface configuration mode:
Troubleshooting Tips
Port Addresses
In the Cisco 6400, port IDs specify the actual physical location of each port on the system. The address is composed of a three-part number in the format slot/subslot/port. The first number identifies the slot in which the card is installed. Card slots are numbered 1 to 8 from left to right. The second number identifies the subslot number. The NLCs are numbered 0 and 1, with 0 being the top NLC facing the front of the system. The third number identifies the physical port number on the module. The port numbers always begin at 0 and are numbered from the top port to the bottom port, facing the back of the switch.
Interface ports maintain the same port ID regardless of whether other cards are installed or removed. However, when you move an NLC to a different slot, the first number in the address changes to reflect the new slot number.
Displaying Port Interface Information
You can identify module ports by physically checking the slot/subslot/port location on the front of the switch. You can also use software commands to display information about a specific interface, or all interfaces, in the system. To display information about every interface, use the show interface command without parameters. To display information about a specific interface, use the show interface command with the interface type and port address in the format show interface atm slot/subslot/port. This command is described in your command reference publication.
Monitoring and Maintaining the DS3 Node Line Card
| Command | Purpose |
|---|---|
Configuration Examples
This section provides the following configuration examples:
UNI Interface Type
The following example shows how to change the default ATM interface type to private using the atm uni command:
Network Clock Source
The following example shows how to select a network-derived clock source for a DS3 interface using the clock source and network-clock-select commands:
Command Reference
This section documents new commands. All other commands used with this feature are documented in the Cisco IOS Release 12.0 T command references.
auto-ferf
To allow an automatic far end receive failure (FERF) to be inserted when an incoming alarm is received, use the auto-ferf interface configuration command. To cancel automatic FERF insertion, use the no form of this command.
- auto-ferf {los | oof | red | ais | lcd}
no auto-ferf { los | oof | red | ais | lcd}
Syntax Description
Default
auto-ferf los
auto-ferf oof
auto-ferf red
auto-ferf ais
auto-ferf lcd (applies to non-plcp mode only)
Command Mode
Command History
| Release | Modification |
|---|---|
Usage Guidelines
This command applies to the DS3 interfaces only.
clock source
To select a transmit clock source for a physical device such as a port, use the clock source interface configuration command. To return the clock source to the default, use the no form of this command.
- clock source {free-running | loop-timed | network-derived}
no clock source {free-running | loop-timed | network-derived}
Syntax Description
|
The transmit clock is derived from the port system clock specified at highest priority when you use the network-clock-select global configuration command. |
Default
Command Mode
Command History
| Release | Modification |
|---|---|
Usage Guidelines
This command allows selection of the transmit clock source for a port's physical device. When a transmit clock port is set to free-running, the port uses the NSP oscillator for clocking.
Example
The following example shows how to enable the loop-timed clocking mode.
Related Commands
framing (interface configuration)
network-clock-select
framing
To select the frame type for the data line, use the framing controller interface configuration command.
- framing {m23adm | m23plcp | cbitadm | cbitplcp}
Syntax Description
Default
Command Mode
Command History
| Release | Modification |
|---|---|
Usage Guidelines
In the DS3 environment, this subcommand allows selection of DS3 framing mode to M23 ADM, M23 PLCP, C-Bit ADM, or C-Bit PLCP.
Example
The following example selects m23adm as the frame type:
Related Command
lbo
To set the line buildout to various lengths, use the lbo interface configuration command. For the DS3 NLC, the syntax is:
- lbo {short | long}
Syntax Description
Default
Command Mode
Command History
| Release | Modification |
|---|---|
Usage Guidelines
The lbo command applies on DS3 interfaces only.
Example
The following example illustrates how to set the line buildout to more than 255 feet for a DS3 NLC:
Glossary
ADM—add drop multiplexer. In an operations support system, a multiplexer that allows a signal to be added into or dropped out of a Synchronous Optical Network (SONET) span.
DS3—digital signal level 3. Framing specification used for transmitting digital signals at 44.736-Mbps on a T3 facility.
NLC—node line card. One of the component cards used in the Cisco 6400. These cards provide the interfaces for moving data into and out of the Cisco 6400 system. They can be used as either uplink or downlink interfaces. Different types of node line cards support different transmission protocols and data rates.
NNI—Network-to-Network Interface. ATM Forum standard that defines the interface between two ATM switches that are both located in a private network or are both located in a public network. The interface between a public switch and private one is defined by the UNI standard.
PLCP—physical layer convergence procedure. Specification that maps ATM cells into physical media, such as T3 or E3, and defines certain management information.
UNI—User-to-Network Interface. ATM Forum specification that defines an interoperability standard for the interface between ATM-based products (a router or an ATM switch) located in a private network and the ATM switches located within the public carrier networks.
VCI—virtual channel identifier. 16-bit field in the header of an ATM cell. The VCI, together with the 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.
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.