| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 271.1 | | KONING::KONING | Eesti vabaks! | Thu Jun 06 1991 16:30 | 6 |
| 40 km between sites: in other words, given that you have a fiber PAIR between
any two ports, each of the two fibers of the pair has a 40 km limit.
That means a contribution of 80 km to the ring circumference, which of course
itself is limited to 200 km...
paul
|
| 271.2 | We can really be creative, can't we? | KYOA::KOCH | It never hurts to ask... | Mon Jun 10 1991 17:01 | 2 |
| Aha! This means we can have multiple sites as long as we don't exceed
the 200km limit total and the 40km between site limits?
|
| 271.3 | | KONING::KONING | Eesti vabaks! | Tue Jun 11 1991 11:48 | 12 |
| Correct.
I recently worked on a configuration involving 4 sites; the distances from
the central site were 3, 20, and 25 km, give or take. Works fine.
Watch out you count everything carefully -- it's easy to skip something and
end up over. Distances add up quickly. Note in particular that you have to
count both "to" and "from" -- in other words, if it's 20 km from the center
to site X, that contributes 40 km to the circumference (20 to get there, 20
more to get back).
paul
|
| 271.4 | Effect of Optical Bypass? | DENVER::HOOVER | | Wed Jul 10 1991 19:09 | 3 |
| How is the 40km distance affected with the use of the optical by-pass
circuitry of the new DECbridges? Where are configuration issues like
this discussed in detail in any documentation?
|
| 271.5 | | KONING::KONING | Eesti vabaks! | Thu Jul 11 1991 11:16 | 5 |
| I don't believe there is any such thing as optical bypass for single mode
fiber. Even if there is, you probably wouldn't want to use it; it would
introduce extra losses that cut directly into your achievable distance.
paul
|
| 271.6 | No bypass for singlemode | BAGELS::LEVY | | Thu Jul 11 1991 13:53 | 3 |
| Only our DAS multimode products will offer optical bypass. The optical
budget of our singlemode link precludes using bypass. (Twice the
minimum loss exceeds the loss budget...)
|