Page 523 - Handbook of Modern Telecommunications

4-54 CRC Handbook of Modern Telecommunications, Second Edition

• Applications
• Devices
• Transmission facilities
Average number of outages for:
• Service access points
• Applications
• Devices
• Transmission facilities

4.4.2.2 Service-Dependent Metrics
Examples of service-dependent metrics are outlined below.
Resource utilization for:
• Service access points
• Applications
• Devices
• Transmission facilities
Leased lines:
• Bit error rate
• Nonavailable seconds
• Severely errored seconds
• Block error ratio
PDH (plesiochronous digital hierarchy) devices:

• Number of problems
• Average duration of problem restoration

SDH (synchronous digital hierarchy) devices:
• Number of problems
• Average duration of problem restoration

Frame Relay service:
• Network delay
• Committed Information Rate (CIR)
• Cyclic Redundancy Check (CRC) Errors
• Discarded frames
• Effective Permanent Virtual Circuit (PVC) throughput
ATM (asynchronous transfer mode) service
• Available bit rate (ABR)
• Constant bit rate (CBR)
• Unspecified bit rate (UBR)
• Variable bit rate (VBR)
• Network delay
• Errored cell rate
• Effective PVC throughput