GarrettCom MAGNUM 6KQE - Manual (Page 33)

Magnum 6KQE Managed Edge Switch Installation and User Guide 02/09
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4.4 Power Budget Calculations for 6KQE 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 6KQE Managed Edge Switch Port Modules
This chapter describes each Port Module (PM), including appearance,
functionality, and status displays.
5.1 6KQE Modules
An important feature of the Magnum 6KQE is the use of Port Modules for
flexible mixed-media connectivity to RJ-45 copper and various fiber media. The first
four ports (1,2,3 & 4) of the Magnum 6KQE Switches are fixed RJ-45 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 6KQE Port modules are not identical to the port modules used in other
6K products such as the 6K25e and 6K16V. For information about other
6K products, please see the applicable manual. For a list of 6KQE Port
Modules, refer to Section 1.2
Each 6KQE Port Module (PM) is individually described in the following sections.