GarrettCom manual Powering the Magnum DS80F and DS80C, Typical

Magnum DS80F & DS80C Dual-speed Stackable Hubs Installation and User Guide (12/01)

Worst case distance = {Worst case OPB, in dB} / [Cable Loss, in dB/Km] where the “Cable Loss” for 62.5/125 and 50/125∝ m (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	Speed,		Std. km	Wave-	Cable	X’mitr	R’cvr	Worst	Worst*	typical	typical*
Port	Std.	Mode	fdx	length	Size	Output	Sens.	OPB,	distance	OPB,	distance
Module			(hdx)	nm	∝ m	PT , dB	PR ,dB	dB	Km, fdx	dB	Km, fdx
DS80F-	100Mb	Multi-	2	1300	62.5/125	-20	-31	9.0	2.5	14	5
MST, MSC	FX	mode	(0.4)		50/125	-23.5	-31	5.5	2.0	12	4
DS80F-SSC	100Mb	Single-	20	1300	9/125	-15	-31	14	28	17.5	35
	FX	mode	(0.4)
DDS80F-	100Mb	Multi-	2	1300	62.5/125	-20	-31	9.0	3.0	15.8	5.5
MTRJ	FX	mode	(0.4)		50/125	-23.5	-31	5.5	2.0	12.2	4.0
Long Reach	100Mb	Single-	40	1300	9/125	-5	-34	29	58
	FX	mode	(0.4)

*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)

3.2.6Connections 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.

3.3Powering 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

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