5-18
October, 1998
GRF 400/1600 Getting Started - 1.4 Update 2
Cabling and Verifying Media Cards
FDDI attachment options
FDDI attachment options
Attachment summary
A variety of attachment options are supported on GRF FDDI cards. Figure 5-10 summarizes
all possible options:
Figure 5-10. DAS and SAS connection options
Refer to the GRF Configuration and Management manual for FDDI configuration information
and copies of configuration files.
SAS and DAS attachments
Single attach station (SAS) refers to a device connected to FDDI media via a single connector.
In comparison, a dual attach station (DAS) device has independent connections to each of two
FDDI rings, for redundancy. Figure 5-11 shows an example of each type of attachment.
Figure 5-11. FDDI media cards used as single and dual attachment nodes
4 single attach:
2 dual attach:
1 dual, 2 single
2 single (or unused),
1
1
1
1
FDDI
A0
B0
A1
B1
FDDI
A0
B0
A1
B1
FDDI
A0
B0
A1
B1
FDDI
A0
B0
A1
B1
(or unused) attach:
1 dual attach:
Concentrator
Four single attachments:
Server
Workstation
FDDI Ring 1
Two dual attachments:
IFDDI
FDDI Ring 2
• • •
Controllers
Workstation
SAS
SAS
SAS
IFDDI
Controllers