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| Title: | FDDI - The Next Generation |
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| Moderator: | NETCAD::STEFANI |
|
| Created: | Thu Apr 27 1989 |
| Last Modified: | Thu Jun 05 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 2259 |
| Total number of notes: | 8590 |
2110.0. "fddi delays linear with fiber length ??" by FIREBL::LEEDS (From VAXinated to Alphaholic) Mon Aug 12 1996 11:35
I have a customer presentation describing remote shadowing (OpenVMS) over
FDDI as one option for high availability. In the presentation, it lists the
following delay times for a 100 mile FDDI connection in this environment:
- One-Way delay is 1ms per 100 miles of site-site link route distance
- Remote $ENQ/$DEQ lock operation increased by 2ms per 100 miles
- Write I/O latency increases by 4ms/100 mi
- Read I/O latency increases by 2ms/100 mi
- Fragmented Reads/Write by 2ms/100 mi/fragment
The customer is looking at putting theses systems only about 2 miles away,
and wants to know how the above numbers scale with distance. Is it truely a
linear relationship between fiber length and delay, or are there aother
factors in the above numbers. If it's linear, then the "one-way" delay for
2 miles should be (1ms/100miles)*2miles) = .02ms (20microSec), right ??
Arlan
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