Managing Wavelength Services on the ONS 15454 MSTP


A key element in delivering wavelength services in a timely manner is the capability to quickly and easily provision the DWDM channels. Additionally, when the DWDM wavelength channels are in place, the associated management system must be capable of providing full accounting and performance monitoring of each wavelength circuit for compliance with service-level agreements (SLAs). The ONS 15454 MSTP can be managed using multiple operations support structure architectures. Depending on the deployment environment, ONS 15454 MSTP provisioning, fault reporting, and performance monitoring can be accomplished using TL1, by way of the Cisco Transport Manager (CTM) element manager system, or by third-party network/element managers capable of communicating through the Common Object Request Broker Architecture (CORBA) or the Simple Network Management Protocol (SNMP). Figure 11-6 illustrates the management solution possibilities for the ONS 15454 MSTP.

Figure 11-6. ONS 15454 MSTP Management Architectures


The level of management support that the ONS 15454 MSTP DWDM system provides varies, depending on the type of wavelength service provided. The highest level of management support is provided for SONET/SDH wavelengths or for wavelength trunks that use the G.709 digital wrapper overheads. For these types of wavelengths, fault management, configuration, accounting, performance, and security (FCAPS) utilities are provided. Other services, such as Ethernet, are monitored via client packet/frame counters and Ethernet remote-monitoring (RMON) statistics.

Fault Management

Fault isolation within the ONS 15454 MSTP system is achievable at both the client and DWDM trunk wavelength levels. Each client input is constantly monitored for signal integrity. The MSTP system provides continuous surveillance of laser bias current, with user-configurable alarming thresholds. This feature helps isolate transmission problems caused by client laser degradation or malfunction. Additionally, the optical power level for each client signal is monitored at ingress to the ONS 15454 MSTP system, along with aggregate channel power measurements. This data is used not only for system power optimization, but also to determine the specific network failure or trouble points for individual wavelength channels.

The digital wrapper functionality allows for DWDM wavelength visibility to transparent wavelength services. With the digital wrapper overhead monitoring, signal degradations in the ONS 15454 MSTP transport network can be discovered and corrected before network channel failure. Used in concert with the automatic power control feature, the ONS 15454 MSTP can self-optimize itself as network fiber conditions deteriorate because of fiber aging or equipment malfunctions.

Moreover, the ONS 15454 MSTP supports SONET-like alarm-correlation functions. Instead of flooding the network with numerous interrelated alarms and conditions, the ONS 15454 MSTP system aggregates and correlates alarms to DWDM network gateway network elements (GNEs). This feature allows alarm-monitoring and surveillance centers to quickly and accurately act upon degrading network conditions with pinpoint precision.

Figure 11-7 illustrates a sample of the fault-management capability of the ONS 15454 Cisco Transport Controller (CTC) graphical user interface (GUI).

Figure 11-7. ONS 15454 MSTP Fault Management Sample


Configuration

The ONS 15454 MSTP is designed to maximize the skill set of those already familiar with ONS 15454 Multiservice Provisioning Platform (MSPP) operations. As such, it employs the same CTC GUI that is used to configure MSPP SONET/SDH networks. The DWDM channels for the ONS 15454 MSTP system are provisioned in a similar manner to SONET/SDH circuits. Consequently, MSPP circuit functions, such as detailed AZ circuit views and point-and-click provisioning, are characteristic of ONS 15454 MSTP circuits. Figure 11-8 displays the detailed view of DWDM wavelength circuit.

Figure 11-8. ONS 15454 MSTP Wavelength Circuit Detail


The MetroPlanner design tool also interfaces with the CTC GUI. The initial DWDM interface card settings from a MetroPlanner design can be uploaded into a DWDM node using CTC, thereby significantly speeding up system turn-up time. Additionally, the MetroPlanner design parameters, such as expected fiber loss and VOA settings, are compared against actual measured values in CTC to ensure overall design integrity.

Performance

When transparent SONET/SDH client signals are provisioned on the ONS 15454 MSTP, the MSTP DWDM system uses the SONET/SDH B1/B2 bytes for end-to-end client monitoring. Standard performance-monitoring parameters, such as severely errored seconds and code violations, are available and can be retrieved and viewed using the CTC GUI or the CTM element manager. The B1/B2 monitoring does not provide health and state information for the associated DWDM wavelength circuit. The DWDM wavelength circuit uses its own communications overhead bytes when digital wrapper encapsulation is turned on. The digital wrapper provides an additional set of wavelength-specific performance-monitoring parameters that can be used to troubleshoot the DWDM network and determine compliance with SLAs.

Table 11-2 details the types of performance-monitoring parameters available for client interfaces and DWDM wavelengths. In addition to the values listed in Table 11-2, optical power statistics are available for all the multiplexer/demultiplexer interface cards and the optical service channel interfaces.

Table 11-2. ONS 15454 MSTP DWDM Performance-Monitoring Parameters

Parameters

Client Interface

G.709 Encapsulated DWDM Wavelength

SONET

SDH

Background Block Errors (BBE)

Background Block Error Ratio (BBER)

Code ViolationsSection (CV-S)

Errored Seconds (ES)

Errored Second Ratio (ESR)

Errored SecondsSection (ES-S)

Errored SecondsLine (ES-L)

Failure Count (FC)

Failure CountLine (FC-L)

Severely Errored Seconds (SES)

Severely Errored SecondsSection (SES-S)

Severely Errored SecondsLine (SES-L)

Severely Errored Seconds Ratio (SESR)

Severely Errored Framing Seconds Section (SEFS-S)

Unavailable Seconds (UAS)

Unavailable SecondsLine (UAS-L)


Security

The ONS 15454 MSPP security features are also applicable to the ONS 15454 MSTP. The CTC GUI allows for user-provisionable security levels ranging from read-only access to superuser authority. The CTM element manager can also be used to further augment the CTC security features by restricting user access to predefined domains, which can be determined by geographic location, ring identification, and so on. Additionally, the Timing Communications Control (TCC) card stores an audit trail that keeps track of each login attempt/failure, and records the activity of each user. A total of 640 audit trail log entries is kept in each node. These entries can be retrieved and archived to any available database source.




Building Multiservice Transport Networks
Building Multiservice Transport Networks
ISBN: 1587052202
EAN: 2147483647
Year: 2004
Pages: 140

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