Specifications

Token Ring Desing Considerations
RADring
Installation & Operation Manual
6-10 Fiber Optic Design Considerations 3/11/98 12:26
Distance Between Hubs
The maximum guaranteed distance between hubs is defined in Table 6-4
with respect to which RI/RO modules are used and which media.
Table 6-4 Maximum Distance Between Hubs
RI/RO Module Max Distance
Between HUBs @
16 Mbps
Lobe Distances (I) Automatic
Cable Break
Other
Features
R-TCR
Copper
Repeater
350 m (STP)
150 m (UTP)
200 m (Level IV,V)
As in Table 6-3, if
TJA follows
Ring In TCR
+ Jitter Attenuator
Media Filter
R-TFR
Fiber Repeater
14 dB Multimode
(up to 3 km)
15 dB Single Mode
(up to 20 km)
As in Table 6- + Jitter Attenuator SMA
or ST
RR-TFC 14 dB Multimode
(up to 3 km)
15 dB Single Mode
(up to 20 km)
Up to 50 m over STP
(TL-4/S) or as in
Table 6-3 if TJA
follows TFC
+ Redundant Link
Option
RR-TIO Dependent on total
ring length
Dependent on total
ring length
+
Guaranteed Lobe Length
In order to provide guaranteed lobe length irrespective of the ring
configuration, each RADring is isolated from the rest of the ring in terms of
network design. This is done by use of repeaters and/or TJA modules which
together ensure a new jitter free signal enters each RADring hub, allowing us
to treat the network design on each RADring separately. These
configurations complement the previous guidelines.
6.5 Fiber Optic Design Considerations
TFR Network
Design
Considerations
•
Use TFR repeaters on long ring segments, as a replacement for copper
repeaters. You will achieve better performance and higher ring
availability.
•
Use TFR repeaters to carry sensitive information by fiber-optic cable on
exposed, outdoor segments.
•
Use TFR repeaters to convert copper segments to fiber-optic segments
where strong electrical interference (from industrial machines, nearby
radar or radio transmitters) may disrupt Token Ring operation, or
lightning strikes or high-voltage lines present a safety hazard.