AFBR-0545Z Fast Ethernet Media Converter Board
with the AFBR-5972Z Transceiver
Application Note 5549
Introduction
The Avago AFBR-5972Z transceiver module enables
system designer to implement a 100 Mbps Fast Ethernet
data link over standard plastic optical ber (POF, NA =
0.5). The AFBR-0545Z media converter board allows a
system designer to quickly evaluate AFBR-5972Z trans-
ceiver module performance. The transceiver module
can be connected with Avago Versatile Link connectors
(AFBR-4526Z).The AFBR-5972Z module is lead free and
RoHS compatible.
AFBR-0545Z Media Converter Kit
The media converter kit includes:
1. Media converter board (2 pieces)
2. 12V DC power supply (2 pieces) plus power supply
adapter (5 types, 2 pieces each)
3. 2 meter POF Cable (NA = 0.5) with duplex connector for
the AFBR-5972Z (P/N HFBR-RSD002Z)
4. CAT 5 patch cable (2 pieces)
5. AFBR-0545Z application note
As shown in Figure 1, the media converter board includes
a twisted pair interface, optical transceiver module, a
media converter PHY chip, and power supply interface.
The media converter PHY chip translates the data signal
from the twisted pair domain to the optical domain.
POF cable has many signi cant advantages over twisted
pair copper media.
Optical cable is immune to, and does not generate, EM
elds.
Complete galvanic isolation is also achieved using
optical communication links.
Plastic optical ber (POF) also o ers a lower weight
media.
POF o ers a low cost cable solution and easy eld
termination.
Figure 1. AFBR-0545Z media converter board with the AFBR-5972Z transceiver
Power Cable
CAT 5 Cable
POF Cable PHY Chip
2
Figure 2. AFBR-0545Z Media converter board schematic
C113
C ,0402-50V -22P-N PO
R110
R ,0402-1% -6K 19
R
,
0402
-
1%
-
49R 9
C 110
C ,0402-16V -10N -X 7R
OSC1
41
X2
40
GND
4
AVC C 1
GND
42
VC C 19
VC C _IO 34
GND_IO
35
GND
20
AVC C 7
GND
43
VC C 39
VC C 44
GND
10
AVC C 11
VC C 48
R106
R ,0402-1% -49R 9
R107
R ,0402-1% -49R 9
R108
R ,0402-1% -49R 9
C109
C ,0402-16V -10N -X 7R
C111
C ,0402-16V -100N -X 7R
C114
C ,0402-50V -22P-N PO
R103
OPEN
R100
R ,0402-1% -1K 00
R101
R ,0402-1% -1K 00
R 114
R ,0402-1% -4K 70
R 115
R ,0402-1% -4K 70
R105
R ,0402-1% -1K 00
R104
R ,0402-1% -1K 00
R121
R ,0402-1% -4K 70
R120
R ,0402-1% -4K 70
SHD
0
FB101
F B ,0402 M PZ 1005S 121C
FB100
F B ,0402 M PZ 1005S 121C
C100
C ,0402-16V -100N -X 7R
R 118
R ,0402-1% -150R
R117
R ,0402-1% -150R
R135
OPEN
3
Figure 3. AFBR-0545Z media converter evaluation board
AFBR-0545Z Circuit Design
The schematic for the AFBR-0545Z media converter board
is shown in Figure 2. The data signal from the twisted
pair medium is routed through magnetic (part of RJ 45
jack)to the IC Plus IP113ALF input media converter input
pins (RXIP and RXIM). The IP113ALF is con gured for 100
Mbps full duplex mode. The transmitter output of the
IP113ALF (FXTDP and FXTDM) is AC coupled to the input
of the Avago AFBR-5972Z transceiver module through
a di erential transmission line with a 100 impedance.
Resistor R103 is not populated because AFBR-5972Z has
an internal 100 resistor for termination (see AFBR-5972Z
data sheet). Resistor R112 provides a 100 termination
for the receiver of the AFBR-5972Z module. The voltage
divider between the IP113ALF and AFBR-5972Z module
biases the IP113ALF PHY chip. Resistors R117 and R118
are needed as termination of the receiver output stage of
AFBR-5972Z. The signal detect (SD) output signal of the
transceiver module is connected to the PHY chip FXSD pin
through the voltage divider formed by resistors R111 and
R116. The FXSD pin is active when the threshold voltage is
higher than 1.35 V.
LED2 and LED1 (in Figure 3) provides visual information
about the presence of supply voltage at AFBR-5972Z
module and RJ 45 jack respectively. LED1 also provides
information about twisted pair link connection. LED2
provides information about the full duplex optical link
connection.
Fast Ethernet Measurement Setup
The Fast Ethernet measurement setup converts the data
signal from the twisted pair domain to the optical domain
and back again to the twisted pair domain. The Fast
Ethernet link is created by connecting the RJ 45 interface
of the media converter board to the network through
a CAT5 patch cable. The duplex POF cable is connected
between the AFBR-5972Z modules, as shown in Figure 4.
The second RJ45 interface is connected to the Ethernet
port of the computer through a CAT5 patch cable.
Figure 4. Fast Ethernet measurement setup
Media Converter
Board
Media Converter
Board
2m POF Cable
Network
AFBR-5972Z RJ 45
IP113 ALF
LED1
LED2
4
Packet Loss Measurement using the Ping Command
This procedure checks the functionality of the AFBR-
0545Z media converter board and creates an optical link
network to measure packet loss.
1. Connect the power supply to the AFBR-0545Z media
converter boards. LED1 and LED2 will ash one time
and a red light can be seen coming out of the AFBR-
5972Z module. This indicates that the media converter
boards are functional.
2. Connect one end of CAT 5 patch cable to the RJ45
interface and other end to the network. LED1 will ash
on and o . Connect the RJ45 interface of the other
media converter board to a computer or a laptop. LED1
will ash on and o .
3. Connect the 2-meter POF duplex cable between the
two AFBR-5972Z media converter boards. This makes a
duplex communication optical link. LED1 and LED2 on
both media converter boards will ash synchronously,
indicating an active optical link network has been
created.
With the link established, a packet loss measurement
can be made with the Internet Ping protocol and ping
command.
Internet Ping Command
The Internet ping command bounces a small packet
o a domain or IP address to test network communica-
tions, and then reports how long the packet took to make
the round trip. The ping command is one of the most
commonly used utilities on the Internet by both people
and automated programs for conducting the most basic
network test.
Figure 5. Ping statistics for avagotech.com: Packet loss = 0%
Command Prompt in Windows NT, 2000, and XP
To use the ping command, open a Command Prompt
window:
Click Start Click Run Type cmd and press enter
In Command Prompt window type “ping -n 10 avagotech.
com”. This means that the ping command will ping
avagotech.com ten times (Figure 5).
As shown in Figure 5, the ping command pinged the
avagotech website ten times and also provided statistics
for the avagotech.com link. For example, the number of
packets sent, received and lost as well as the minimum,
maximum and average round-trip time in milliseconds
were reported. In this example there were no packets lost
(0% loss).
For the test shown in Figure 6, the CAT5 patch cable
from the media converter board (which is connected to
a computer or laptop) was purposely removed to observe
the packet loss. The results of the ping command “ping -n
10 avagotech.com” – with the CAT5 patch cable removed
– show the packet loss phenomena. Ten packets were
sent, six packets were received and four packets failed to
reach the destination host. Packet loss was 40%.
References
1. IC Plus Corporation: http://www.icplus.com.tw/
2. Avago AFBR-5972Z transceiver data sheet: www.avagotech.com/docs/AV02-2701EN
Figure 6. Ping statistics for avagotech.com: Packet loss = 40%
For product information and a complete list of distributors, please go to our web site: www.avagotech.com
Avago, Avago Technologies, and the A logo are trademarks of Avago Technologies in the United States and other countries.
Data subject to change. Copyright © 2005-2012 Avago Technologies. All rights reserved.
AV02-3374EN - July 6, 2012
