1–2
DECbridge 500/600 Series Problem Solving
These bridges are store-and-forward devices. That is, they receive and store packets
from the FDDI ring and IEEE 802.3/Ethernet network segments, then selectively fil-
ter (discard) the packets or forward them to the appropriate network.
As shown in Table 1–1, various network interfaces are available, depending on the
particular bridge model.
Table 1–1:
DECbridge 500/600 Series Units
Model
Option #
No. of
FDDI
FDDI Optics
NI Ports Connection
500
DEFEB-AA/AB
1
SAS
Multimode
510
DEFEB-AC/AD
1
SAS
Multimode
518
DEFEB-AS/AT
1
SAS
Single-mode
520
DEFEB-DA/DB
1
DAS
Multimode (Port A/Port B)
524
DEFEB-DP/DQ
1
DAS
Single-mode (Port A) / Multimode (Port B)
526
DEFEB-DM/DN
1
DAS
Multimode (Port A) / Single-mode (Port B)
528
DEFEB-DS/DT
1
DAS
Single-mode (Port A/Port B)
600
DEFEB-UC/UD
3
None
Null
610
DEFEB-TA/TB
3
SAS
Multimode
618
DEFEB-TS/TT
3
SAS
Single-mode
620
DEFEB-LA/LB
3
DAS
Multimode
624
DEFEB-LP/LQ
3
DAS
Single-mode (Port A) / Multimode (Port B)
626
DEFEB-LM/LN
3
DAS
Multimode (Port A) / Single-mode (Port B)
628
DEFEB-LS/LT
3
DAS
Single-mode
FDDI Interfaces:
•
A single attachment station (SAS) with one connector or a dual attachment
station (DAS) with two connectors. Each connector can be either multimode
or single-mode. The DAS multimode versions also have a relay driver to con-
trol an optional optical bypass relay.
•
A null interface that provides no connection to the FDDI network.
