Dante DFG48044X Руководство по установке и эксплуатации - Страница 14
Просмотреть онлайн или скачать pdf Руководство по установке и эксплуатации для Переключатель Dante DFG48044X. Dante DFG48044X 18 страниц. Digital fiber optic ethernet edge switch 10/100mbps standalone unit
3.8.4 Connecting Single-Mode Fiber Optic
When using single-mode fiber cable, be sure to use single-mode fiber port connectors. Single-mode fiber
cable has a smaller diameter than multi-mode fiber cable (9/125 microns for single-mode, 50/125 or
62.5/125 microns for multi-mode where xx/xx are the diameters of the core and the core plus the cladding
respectively). Single-mode fiber allows full bandwidth at longer distances, about 20Km with the multi-mode
SC. The same procedures as for multi-mode fiber apply to single-mode fiber connectors. Follow the steps
listed in Section 3.8.2 above.
3.8.5 Power Budget Calculations for DFG48044X Series, Fiber Media
Receiver Sensitivity and Transmitter Power are the parameters necessary to compute the power budget. To
calculate the power budget of different fiber media installations using Dante Security Edge Switch products, the
following equations should be used:
OPB (Optical Power Budget) = P
where P
= Transmitter Output Power, and P
T
Worst case OPB = OPB - 1dB (for LED aging) - 1dB (for insertion loss)
Worst case distance = {Worst case OPB, in dB} / [Cable Loss, in dB/Km]
where the "Cable Loss" for 62.5/125 and 50/125µm (MM) is 2.8 dB/km,
and the "Cable Loss" for 9/125 (Single-mode) is 0.5 dB/km
and the "Cable Loss" for 9/125 (Single-mode) is 0.25 dB/km (SSCX)
The following data has been collected from component manufacturer's (Agilent's, JDS-Uniphase, stratus,
Lucent's) web sites and catalogs to provide guidance to network integrators and installers-
* 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)
3.8.6 Connections to NICs which support Auto-Negotiation, RJ-45 ports
The copper ports of DFG48044X Series Edge Switches 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 DFG48044X, 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
100Mbs operation is in use, the 10/100 LED is illuminated steady ON and is OFF if traffic is 10 Mbps.
(min) - P
(min)
T
R
= Receiver Sensitivity
R