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Magnum DS80F & DS80C Dual-speed Stackable Hubs Installation and User Guide (12/01)
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Worst case distance = {Worst case OPB, in dB} / [Cable Loss, in dB/Km]
where the “Cable Loss” for 62.5/125 and 50/125
µm (m.m.) is 2.8 dB/km,
and the “Cable Loss” for 100/140 (Multi-mode) is 3.3 dB/km,
and the “Cable Loss” for 9/125 (Single-mode) is 0.5 dB/km
The following data has been collected from component manufacturer’s (HP’s and Siemens’) web
sites and catalogs to provide guidance to network designers and installers.
Fiber
Port
Module
Speed,
Std.
Mode
Std. km
fdx
(hdx)
Wave-
length
nm
Cable
Size
µ
µµ
µm
X’mitr
Output
P
T
,
dB
R’cvr
Sens.
P
R
,
dB
Worst
OPB,
dB
Worst*
distance
Km, fdx
typical
OPB,
dB
typical*
distance
Km, fdx
DS80F-
MST, MSC
100Mb
FX
Multi-
mode
2
(0.4)
1300
62.5/125
50/125
-20
-23.5
-31
-31
9.0
5.5
2.5
2.0
14
12
5
4
DS80F-SSC
100Mb
FX
Single-
mode
20
(0.4)
1300 9/125 -15 -31 14 28 17.5 35
DDS80F-
MTRJ
100Mb
FX
Multi-
mode
2
(0.4)
1300
62.5/125
50/125
-20
-23.5
-31
-31
9.0
5.5
3.0
2.0
15.8
12.2
5.5
4.0
Long Reach
100Mb
FX
Single-
mode
40
(0.4)
1300
9/125 -5 -34 29 58
* Note: The use of either multi-mode or single-mode fiber to operate at 100Mbps speed over
long distances (i.e., over approx. 400 meters) can be achieved
only if the following
factors are both applied:
• The 100Mb fiber segment must operate in full-duplex (FDX) mode, and
• The worst-case OPB of the fiber link must be greater than the fiber cable’s passive
Attenuation.
(Attenuation = Cable loss + LED aging loss + Insertion loss + safety factor)
3.2.6 Connections to NICs which support Auto-Negotiation, RJ-45 ports
The copper ports of Magnum DS80F and DS80C Dual-Speed Hubs will function
properly with NICs (Network Interface Cards) which support Auto-Negotiation, and the Fast
Link Pulse (FLP) coding for the 100BASE-TX signaling system. When connecting a NIC to the
DS80F or DS80C, it may be necessary to reload the NIC drivers on the user device if the NIC
has been communicating with a protocol other than 100BASE-TX (such as 10BASE-T). When
100Mb operation is agreed and in use, the SPEED LED is illuminated steady ON. It is OFF if
no traffic or if 10Mbps traffic.
3.3 Powering the Magnum DS80F and DS80C
Each Magnum DS80F and DS80C Personal Hub is provided with an external power
supply, and has a jack for the DC power cord in the rear. A lightweight DC power cord for