GarrettCom MAGNUM 6KM - Manual (Page 29)

Magnum 6KM Mobile Ethernet Switch Installation and User Guide 07/10
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4.4 Power Budget Calculations for 6KM Modules with 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 Magnum products, the following equations should be used:
OPB (Optical Power Budget) = P
T
(min) - P
R
(min)
where P
T
= Transmitter Output Power, and P
R
= Receiver Sensitivity
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 50/125 μ 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
and the “Cable Loss” for 9/125 (Single-mode) is 0.4 dB/km (LX25)
and the “Cable Loss” for 9/125 (Single-mode) is 0.25 dB/km (ZX40)
and the “Cable Loss” for 9/125 (Single-mode) is 0.2 dB/km (ZX70)
See http://www.garrettcom.com/techsupport/power_budget.pdf for more information on
Power budget calculations
5.0
Magnum 6KM Mobile Ethernet Switch Port Modules
This chapter describes each Port Module (PM), including appearance,
functionality, and status displays.
5.1 6KM
Modules
An important feature of the Magnum 6KM is the use of Port Modules for
flexible mixed-media connectivity to M12 copper and fiber media. The first four ports
(1,2,3 & 4) of the Magnum 6KM Switches are fixed M12 copper ports with dual-speed
10/100Mbps auto-negotiating capability. Additionally the switch can accept up to two
Port Modules to provide the user with up to 6 additional ports (10 total) providing a wide
selection of Ethernet copper and fiber media connections with 10, 100 and 1000Mbps
capability and up to 70km.
Note: The 6KM Port modules are not identical to the port modules used in other
6K products such as the 6KL, 6KQ, 6K32s 6K25e and 6K16V. For
information about other 6K products, please see the applicable manual.
For a list of 6KM Port Modules, refer to Section 1.2
Each 6KM Port Module (PM) is individually described in the following sections.