Hitachi US7070447-001 사용자 설명서
US7070447-001, Rev 01
12-
1
Chapter 12
FDDI Concepts
FDDI employes a dual ring topology using two counter-rotating fiber rings: a
primary and secondary. Data travels on the primary ring while the secondary
backup ring is utilized if the primary ring fails. The data rate is 100 Mbps based
on a timed-token access method. The total length of the ring can extend up to 200
kilometers with nodes spaced up to 2 kilometers over multimode fiber.
primary and secondary. Data travels on the primary ring while the secondary
backup ring is utilized if the primary ring fails. The data rate is 100 Mbps based
on a timed-token access method. The total length of the ring can extend up to 200
kilometers with nodes spaced up to 2 kilometers over multimode fiber.
Figure 12-1.
HS150 on an FDDI network
Dual Ring
DAS
HS 150
SAS
HS 150
Concentrator