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transmitter to start sending the packets. Of course, the transmitting device must also support the 802.3x
flow control standard in order to communicate properly during normal operation.
Note: When in half-duplex mode, the quad-switch implements a backpressure algorithm on
10/100Mbps ports for flow control. That is, the switch prevents frames from entering the device by forcing
a collision indication on the half-duplex ports that are receiving. This temporary "collision" delay allows the
available buffer space to improve, as the switch catches up with the traffic flow.
4.7
Power Budget Calculations for Quad-Series QPM's 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 ProSwitch products, the
following equations should be used:
OPB (Optical Power Budget) = P
(min) - P
(min)
T
R
where P
= Transmitter Output Power, and P
T
R
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 (M.m) is 2.8 dB/km,
and the "Cable Loss" for 100/140 (Multimode) is 3.3 dB/km,
and the "Cable Loss" for 9/125 (Singlemode) 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
Std. km
Wave-
Cable
Port
Speed,
fdx
length
Size
µm
Module
Std.
Mode
(hdx)
nm
QPM10-
10Mbps
Multi-
2
62.5/125
FST
FL
mode
(2)
850
100/140
50/125
QPM-
100Mbps
Multi-
2
1300 62.5/125
MST,
FX
mode
(0.4)
50/125
MSC
QPM-
100Mbps
Single
18+
1300
9/125
SSC
FX
mode
(0.4)
QPM-
100Mbps
Multi-
2
1300 62.5/125
MTRJ
FX
mode
(0.4)
50/125
QPM-
100Mbps
Multi-
2
1300 62.5/125
MV45
FX
mode
(0.4)
* Note: The use of either multimode or singlemode fiber to operate at 100Mbps speed over long distances
(i.e., in excess of approx. 400 meters) can be achieved only if the following factors are both applied:
•
The 100Mbps fiber segment must operate in full duplex (FDX) mode, i.e. the full-duplex (factory
default) setting for 100Mbps fiber ports must be used, 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)
5.0
Introduction - ProSwitch Quad-Series Quad-Port Modules (QPM)
This chapter describes each Quad-Port Module (QPM), including appearance, functionality, and
status displays.
5.1
Inspecting the Package and Product
ProSwitch Quad-Series Fiber Switches
Installation and User Guide
= Receiver Sensitivity
X'mitr
R'cvr
Worst
Worst*
typical
typical*
Output
Sens.
OPB,
distance
OPB,
distance
P
dB
P
dB
dB
Km, fdx
dB
Km, fdx
T ,
R ,
-15.0
-31
14
5
17
-9.5
-31
19.5
5.9
23.5
-19.5
-31
9.5
3.4
13.5
4.8
-20
-31
9.0
2.5
14
-23.5
-31
5.5
2.0
12
-15
-31
14
28
17.5
35
-20
-31
9.0
3.0
15.8
5.5
-23.5
-31
5.5
2.0
12.2
4.0
-14
-31
15
5
16
5.7
Page 20
This section applies only to QPMs shipped as separate items, i.e., QPMs not factory installed in a
ProSwitch Quad-Series QPM slot.
Examine the shipping container for obvious damage prior to installing a QPM; notify the carrier of
any damage which you believe occurred during shipment or delivery. Inspect the contents of this
package for any signs of damage and ensure that the items listed below are included.
This package should contain:
•
1 or more QPMs
•
Installation instructions, with illustrations
Remove the QPM(s) from the shipping container. Be sure to keep the shipping container should
you need to ship any of the QPMs separately at a later date. In the event there are items missing or
damaged contact your supplier. If you need to return the unit, use the original shipping container if
possible. Refer to Chapter 5 for specific return procedures.
5.2
Product Description
An important feature of the ProSwitch Quad-Series is the use of Quad-Port Modules (QPMs) for
flexible mixed-media connectivity to RJ45 and fiber media. Since the ProSwitch Quad-Series Switches
have dual-speed capability for copper ports, the quad-port interfaces are designed to support all standard
Ethernet media types at 10 or 100Mps speed. Each QPM provides four ports for connecting Ethernet
segments with its individual connector type and media.
For a list of Quad-Port Module types, refer to Section 1.2
Each QPM is individually described in the following sections.
5.2.1
QPM-MST, 100Mbps multimode FX-ST Quad-port Module, "twist lock"
The ProSwitch QPM-MST is a multimode 100Mbps fiber optic
quad-port module equipped with dual ST-type connectors. It functions as
a fiber optic transceiver to support 100BASE-FX network segments.
6
When installed in a Quad-Series Fiber Switch, it supports fiber optic cable
7
distances up the IEEE-standard 100Mbps distance limits, i.e., typically
2km at full-duplex and 412m at half-duplex.
5
Each port has an Activity (ACT) LED indicating packets being
4
received, a Link (LK) LED that indicates proper connectivity with the
remote device when lit, and a FDX/HDX LED to indicate full-duplex mode
when lit (or half-duplex when off). Lettering on the front of the module
identifies it as "100 FX" to avoid confusion with other similar-looking
10Mbps fiber QPMs.
5.2.1a QPM10-MST, 10Mbps multimode FL-ST-Quad-port type, "twist-lock"
The ProSwitch QPM10-MST is a multimode 10Mbps fiber optic module equipped with dual ST-
type connectors. It looks similar to the 100Mbps QPM-MST, but has the lettering "10Mbps" on the front to
distinguish it. It supports fiber optic cable distances up the IEEE-standard 10Mbps distance limits, i.e.,
typically 2km at full-duplex and at half-duplex.
Each port has an Activity (ACT) LED indicating packets being received, a Link (LK) LED that
indicates proper connectivity with the remote device when lit, and a FDX/HDX LED to indicate full-duplex
mode when lit (or half-duplex when off). Lettering on the front of the module identifies it as "10 FL" to
avoid confusion with other similar-looking 100Mbps fiber QPMs.
ProSwitch Quad-Series Fiber Switches
100BASE-FX, and 10BASE-FL
ST Connectors
2
3
FDX/HDX
1
2
3
LK
1
2
3
4
1
2
ACTIVITY
3
FULL/HALF
DUPLEX MODE
Installation and User Guide
1
4
ACT
LINK
Page 21
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