Fault Management

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Fault Management

Today Carrier Ethernet Services are expected to match the reliability and predictability of legacy and TDM networks. Service Level Agreements are put in place to make sure that service availability is kept to expectations and often have penalties if not meet.

To achieve such availability continuous monitoring of network services is required with the abililty to get instant notification of service issues such as outages and the abililty to isolate the location of network faults; especially where carrier networks can span many miles.

Our MetroCONNECT FCM product family provide:

  • IEEE 802.1ag Connectivity Fault Management (CFM)
  • IEEE 802.3ah Link OAM with dying gasp
  • Optical Time Domain Reflectometer (OTDR) for cable fault location

These fault management systems are crucial to network operations.

IEEE 802.1ag Connectivity Fault Management

802.1ag is a standard that helps improve customer satisfaction by helping monitor network services and providing some predictability to the service; this has a positive benefit against service level agreements. 802.1ag help fault manage by constantly monitoring services and produces alerts and notifications of any faults detected.

IEE 802.3ah Link OAM

802.3ah offers a range of fault management functions. It provides a threshold based performance monitoring of links to monitor for any degradation. Individual network links can be monitored. A dying gasp alarm is sent if there is a loss of power.

Optical Time Domain Reflectometer

OTDR is an optical fibre fault-detection mechanism that calculates the distance to the fault along a fibre link. Our MetroCONNECT FCM Ethernet Demarcation Devices (EDD) and NetTESTER Network Performance Assureance product families can send an alarm to a Service Provider's Network Operations Centre and report both the loss of communications and the distance to the problem, allowing fast remedial action to be undertaken.

Example: OTDR Fibre Measurement & Alarming using the NetTESTER

OTDR monitoring of 'data over fibre' links without interaction with active equipment terminating each end of the link (e.g. these may be operated by a third party)

OTDR Fibre Measurement and Alarming

Typically (alongside regular NOC functions), for both:

  • Pro-active SNMP 'Trap' alarm reporting, and
  • Re-active interrogation via Browser / Telnet/SSH to NT1003 Management system for more detailed analysis

Example: OTDR Alarming of P2P Ethernet link using the NetTESTER

OTDR monitoring of critical point-to-point 'Ethernet over fibre' links of up to 1Gbps

OTDR Alarming of P2P Ethernet link

Typically (alongside regular NOC functions), for both:

  • Pro-active SNMP 'Trap' alarm reporting, and
  • Re-active interrogation via Browser / Telnet/SSH to NT1003 Management system for more detailed analysis
Network Performance, management and provisioning

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