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Magnum DS880 Dual-Speed Stackable Hubs Installation and User Guide (05/01)
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2.2 Product Description - General (continued)
1 2 3 4 5 6 7 8
COL
ACT
PWR
LK
RX
BR UPLINK
1 2 3 4 5 6
7 8
DS880A
DS880B
Bridge Module
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COL
ACT
PWR
LK
RX
BR UPLINK
1 2 3 4 5 6 7 8
Figure 2.2.2 : DS880B is a DS880A with a bridge module built-in for 10 to 100 bridging
Only one DS880-B unit is needed to support a stack. Additional 8-port units of the
DS880-A “add-on” hubs . . . units that do not have the bridge module inside, and which cost less
accordingly . . . can be added to the stack, up to the 4-unit stack maximum. In a stack, the
DS880-B unit (illustrated below as the bottom unit) can be in any stack position.
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COL
ACT
100 10
PWR
LK
RX
BR
100
UPLINK
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
COL
ACT
100 10
PWR
LK
RX
BR
100
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
COL
ACT
100 10
PWR
LK
RX
BR
100
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
COL
100 10
RX
ACT
PWR
LK
BR
100
1 2 3 4 5 6 7 8
UPLINK
UPLINK
UPLINK
A
A
A
B
Figure 2.2.3 : Stack of DS880’s, 3 @ DS880A’s and 1 @ DS880-B
DS880-A units can also be used without a DS880-B, whereupon they will function as
dual-speed stackable hubs. This could be desired if there is an external non-auto-sensing switch
(such as the Magnum 300ES Two-Port Switch) available to interconnect the two speed domains,
or if only 100Mb devices are connected and the 10Mb domain is unused (or vice-versa), or if
dual-speed operation with two unconnected and uncoordinated domains is needed for the
application.
Each DS880 has its own internal power supply, and is easily added to an existing 10
or 100Mb network. DS880s are suitable for wiring closet shelf, table-top or vertical mounting.