Cisco Systems OC-12/STM-14 manual Using show Commands to Check System Status

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Cisco IOS Software Configuration for the 1-Port Channelized OC-12/STM-4 (DS3) Line Card

How to Configure the 1-Port Channelized OC-12/STM-4 (DS3) Line Card

Enabling Payload Scrambling

Payload (data) scrambling converts the data received by the local or remote DS3 ports from any of the three supported third-party DSU vendor modes (Digital-Link, Kentrox, and Larscom) as well as the default, Cisco mode. To enable payload scrambling on the local and remote DS3 ports, you must enter the scramble interface configuration command. If you do not enter the scramble command, payload scrambling remains disabled by default on the local and remote DS3 ports.

Configuring Cyclic Redundancy Checks

The 1-port channelized OC-12/STM-4 (DS3) line card uses a 16-bit Cyclic Redundancy Check by default, but also supports a 32-bit CRC to detect errors in transmitted data. You can set the CRC by entering the crc interface configuration command. The router that sends the data divides the bits in the frame message by a predetermined number to calculate a frame check sequence (FCS). Before sending the data, the router appends the FCS value to ensure that the frame message contents are exactly divisible by a predetermined number. The router that receives the data divides the frame message by the same predetermined number and calculates the FCS. If the result is not 0, the router that receives the data assumes that a transmission error occurred and sends a request to the router to resend the data.

Note When enabling a 16-bit or 32-bit CRC on a local interface, ensure that the remote device is also configured for a 16-bit or 32-bit CRC.

Configuring the Clock Source

The only exception for matching local and remote DS3 port configurations is that the clock sources must be set opposite each other. Therefore, if you enter the clock source line controller configuration command, you must enter clock source internal for the remote DS3 port. The ADM clock source is configured to internal.

Specifying DS3 Channel Framing

In interface configuration mode, specify DS3 framing by entering the framing [c-bit m13] interface configuration. Use the no form of this command to return to the default, c-bit framing.

Using show Commands to Check System Status

Each Cisco 12000 Series Router line card maintains information about its configuration, traffic, errors, and so on. You can access this information by using the show commands. Following are descriptions and examples of the show commands.

•The show interfaces command outputs information about the system interfaces. Following is a sample of the show interface serial command for port 0 of a line card installed in slot 1, channel 1:

Router# show interfaces serial 1/0:1

Serial1/0:1 is up, line protocol is up

Hardware is OC12-Channelized-to-DS3 channel

Internet address is 101.5.1.2/24

MTU 4470 bytes, BW 44210 Kbit, DLY 200 usec, rely 255/255, load 1/255

Encapsulation HDLC, crc 16, loopback not set

Keepalive set (10 sec)

Last input 00:00:05, output 00:00:03, output hang never

Cisco IOS Release 12.0(8)S

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Contents Contents Configuring the OC-12 Controller Router# show controller oc12 1/0Router# configure terminal Routerconfig# controller OC12 1/0Configuring the DS3 Serial Interface Configuration Command Default ValueRouterconfig# interface serial 1/01 Routerconfig-if#ip address 10.1.2.3Router# copy running-config startup-config Cisco Remote Connection ManagementNo dsu mode No framing c-bit m13Cisco digital-link kentrox larscom No dsu bandwidth Kilobits/secVerifying Local and Remote DS3 Port Settings Selecting a DSU ModeSetting the Sending and Receiving Rate Configuring the DSU Bandwidth RangeUsing show Commands to Check System Status Configuring Cyclic Redundancy ChecksConfiguring the Clock Source Enabling Payload ScramblingShow controllers oc12 slot/port Router# show controllers oc12 1/0Router# show controllers oc12 1/01 Show controllers oc12 slot/portchannel#Show controllers oc12 detail Router# show running-config Ip subnet-zeroLoopback modes Configuration Mode Command Using Loopback CommandsOC-12 Controller Loopback Mode No loopback local network remote configuration command Configuring DS3 Port BER TestingDS3 Channel Loopback Mode Checking Bit Errors Using a Bert Bert Pattern To Invoke CommandRouter# show controller oc12 1/01 bert Entering Errors in BER TestsUsing show Commands to Verify Bert Configuration Bert Information Explanation BertBert Information Explanation Routerconfig-if#ip address 1.1.5.1 Related Documents Technical AssistanceRelated Topic Document Title Description Link

OC-12/STM-14 specifications

Cisco Systems OC-12/STM-14 is a high-performance networking solution designed to meet the demands of modern telecommunications and data transport applications. Operating at a data rate of 622 Mbps, the OC-12 (Optical Carrier level 12) and STM-14 (Synchronous Transport Module level 14), this technology provides a reliable and efficient method for organizations to transmit large volumes of data over fiber optic networks.

One of the key features of the OC-12/STM-14 system is its capability for high-speed data transfer. This makes it an ideal choice for service providers looking to deliver broadband services, video streaming, and other bandwidth-intensive applications. With support for multiple protocols, including SONET (Synchronous Optical Network) and SDH (Synchronous Digital Hierarchy), the OC-12/STM-14 can facilitate smooth communication and interoperability between various network devices.

Another significant characteristic of the OC-12/STM-14 is its scalability. Organizations can easily scale their networks by adding additional OC-12/STM-14 connections, accommodating their growing bandwidth needs without a complete overhaul of existing infrastructure. This flexibility is essential for businesses that expect fluctuations in data traffic or are anticipating future expansion.

Additionally, Cisco's OC-12/STM-14 employs advanced error correction and fault tolerance features, ensuring high reliability and minimal downtime. It supports sophisticated monitoring and network management capabilities, allowing administrators to proactively manage network performance and troubleshoot potential issues before they affect service quality.

Security is also a critical aspect of the OC-12/STM-14 architecture. Cisco incorporates robust security protocols to safeguard sensitive data during transmission, ensuring compliance with industry standards and protecting against unauthorized access.

In terms of compatibility, the Cisco OC-12/STM-14 integrates seamlessly with existing infrastructure and can work alongside various routing platforms. This compatibility significantly reduces the cost and complexity associated with upgrading legacy systems.

Ultimately, Cisco Systems OC-12/STM-14 offers a powerful solution for enterprises and service providers looking to enhance their networking capabilities. With its high-speed data transfer, scalability, reliability, and security features, it stands as a cornerstone technology in advanced telecommunications and data networking.
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