Figure 10. Atm Configuration Example - IBM 8265 Site Preparation Manual

Calculating Power Loss in an ATM Connection

Figure 10. ATM Configuration Example

34
IBM 8265: Planning and Site Preparation Guide
This section contains an example of how to calculate power loss in a connection, that
is, between two ports, and between a port and a user device. The data used to
calculate the distances is taken from the tables in the preceding sections:
•
"Optical Power Budget" on page 28
•
"Optical Power Loss Through Connectors" on page 29
•
"Optical Power Loss Through Splicing" on page 30
•
"Optical Power Loss By Fiber Cable Type" on page 31
•
"Optical Power Loss Through Patch Panels" on page 32
•
"Optical Power Loss Through Jumper Cables" on page 33.
Example
In the example shown in Figure 10, the connection between ATM Desktop A and ATM
Desktop D uses multimode fiber cable (62.5/125 micron) and consists of the following
three links:
1. The link from ATM Desktop A, via a patch panel, to a 155Mbps port of a module
installed in 8265 B
2. The link from a 622Mbps port of a module installed in 8265 B, via patch panels, to
a 622Mbps port of a module installed in 8265 C
3. The link from a 155Mbps port in 8265 C, via a patch panel, to ATM Desktop D.
To calculate the total power loss on each of these links, the power loss for each
component in the link must be added together. If the total power loss is less than the
Optical Power Budget, then the link is valid.