Page 570 - Handbook of Modern Telecommunications

Network Organization and Governance 4-101

Switching Systems
IP-Switches Rating Billing

IP-Routers Analysis of Traffic
Rules for
Distribution
Firewalls Analysis of Security
Security Servers Input for Provisioning Analysis
Mediation Device
Other Managed Devices

FIGu RE 4.5.15 Sample mediation architecture.
Figure 4.5.15 shows a simple mediation solution.
The following recommendations may be utilized to support settlements between service providers.
Settlement periods could be once in a month or once in a quarter. In case of a very close relationship,
service providers may agree to a flat fee. But this agreement is still based on middle and long range traf-
fic observations.
These settlement rules are independent from the services billed to clients of customers.
It is recommended that the following measurements be supported at peering points:

1. Availability: availability of the Inter-Provider-Access channel/peering point
• Metrics: middle availability, total operating time, total outage time, number of outages,
list of single outages
• Measurement technique: Ping
• Operational support: 24 x 365 in all 15 minutes
• Reporting: overseer is the receiver; flexibility is required in compressing and archiving
data and reports
2. Throughput: in the WAN between selected measurement points in Bits/s; utilization will be com-
puted in dependence of the bandwidth
• Measurement technique: permanent and optional measurements using generated traffic
flows
• Measurement frequency: daily once for permanent measurements
• Reporting: overseer is the receiver; flexibility is required in compressing and archiving
data and reports
3. Latency: signal delay < x ms between two selected measurement points
• Measurement technique: 25 x 64 Byte-ICMP Ping; building averages over 25
measurements
• Measurement frequency: 24 x 365 in all 15 minutes
• Reporting: overseer is the receiver; flexibility is required in compressing and archiving
data and reports
4. Variance: the high and low marks of latency measurements are considered as the basis
• Measurement technique: permanent and optional measurements using generated traffic
flows
• Measurement frequency: daily once for permanent measurements
• Reporting: overseer is the receiver; flexibility is required in compressing and archiving
data and reports
The sites of a typical enterprise are going to be supported by multiple service providers. The depth of
collaboration is different. The physical configuration of peering points may be different; it is expected
that routers, switches, and network access control (NAC) devices will play a key role. For networking the
peering points, LANs and VLANs are going to be used.