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Magnum DS80F & DS80C Dual-speed Stackable Hubs
Worst case distance = {Worst case OPB, in dB} / [Cable Loss, in dB/Km]
where the "Cable Loss" for 62.5/125 and 50/125
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
Speed,
Port
Std.
Module
DS80F-
100Mb
FX
MST, MSC
100Mb
DS80F-SSC
FX
100Mb
DDS80F-
FX
MTRJ
100Mb
Long Reach
FX
* 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
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
www GarrettCom com
.
Std. km
Wave-
fdx
length
Mode
(hdx)
nm
Multi-
2
1300 62.5/125
mode
(0.4)
Single-
20
1300
mode
(0.4)
Multi-
2
1300 62.5/125
mode
(0.4)
Single-
40
1300
mode
(0.4)
.
Installation and User Guide (12/01)
(m.m.) is 2.8 dB/km,
m
Cable
X'mitr
R'cvr
Size
Output
Sens.
P
dB
P
dB
m
T ,
R ,
-20
-31
50/125
-23.5
-31
9/125
-15
-31
-20
-31
50/125
-23.5
-31
9/125
-5
-34
15
Worst
Worst*
typical
OPB,
distance
OPB,
dB
Km, fdx
dB
9.0
2.5
14
5.5
2.0
12
14
28
17.5
9.0
3.0
15.8
5.5
2.0
12.2
29
58
only
if the following
typical*
distance
Km, fdx
5
4
35
5.5
4.0
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