MGBC-20-8-X-S Optical Fibre Channel
Gigabit Interface Converter (GBIC) - 2.125GBaud
Features
®
ORDERING INFORMATION
MGBC - 20 - 8 - X - S
Optoelectronic Products
7444 W. Wilson Ave • Chicago • IL 60656
708/867-9600 • 800/323-6858 • Fax: 708/867-0996
email: optoinfo@methode.com
http://www.methode.com
MODULE SPECIFICATIONS - ABSOLUTE MAXIMUM RATINGS
PARAMETER
Storage Temperature
Supply Voltage
Data AC Voltage
Data DC Voltage
SYMBOL
Tstg
V
DD
T, V
DD
R
Tx+, Tx-
Tx+, Tx-
MIN
-40
MAX
85
6.00
2.6
10
UNITS
°C
V
V pp
V pk
NOTES
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SERIAL IDENTIFICATION
S
- Serial ID
WAVELENGTH
1
- 850nm ( multimode )
2
- 1300nm (single mode) 2km
2M
- 1300nm (single mode) 10km
2L
- 1300nm (single mode) 20km
COMMUNICATIONS PROTOCOL
8
- Fibre Channel 2.125 GBaud
n
Compliant with Gigabit Interface Converter
(GBIC) specification
n
Compliant With ANSI X3T11 Fibre Channel specification
for optical links
n
Hot pluggable
n
Single +5V Power Supply
n
Supports Serial ID functionality
PRODUCT OVERVIEW
The MGBC-20-8-X-S GBIC transceiver module is a high
performance integrated duplex data link for bi-directional
communication over single mode or multimode optical
fiber. It is compliant with the Gigabit Interface Converter
(GBIC) specification. The MGBC-20-8 is specifically
designed for high speed Fibre Channel data links at
2.125 Gbps. The Methode GBIC transceiver is hot
pluggable which allows a suitably designed enclosure to
be changed from one type of external interface to another
simply by plugging in a GBIC having the alternative
external interface.
SHORT WAVELENGTH LASER
The use of short wavelength lasers and high volume
production processes has resulted in a low cost, high
performance datalink which communicates reliably at
distances of 300 m over 50µm multimode optical fiber
with data transfer rates of 2.125 GBaud.
LONG WAVELENGTH LASER
For intermediate and long reach data links, the
MGBC-20-8-2-S with single mode optics can extend the
interconnect distance in excess of 20km.
-10
V
DD
- ground
Differential
V (Tx+ or Tx-) - ground
MODULE SPECIFICATION - RECOMMENDED OPERATING CONDITIONS
PARAMETER
Ambient Operating Temperature
Supply Voltage
Baud Rate
SYMBOL
Ta
V
DD
T, V
DD
R
BRate
MIN
0
4.75
TYP
5.00
2.125
MAX
70
5.25
UNITS
°C
VD C
GBaud
NOTES
±100ppm
9245.01
MGBC-20-8-X-S Optical Fibre Channel
Gigabit Interface Converters (GBIC) - 2.125GBaud
PERFORMANCE SPECIFICATIONS - ELECTRICAL
PAR AMETER
Bi t Error Rate
Supply C urrent
Surge C urrent
TR AN SMITTER
PEC L Input (D i fferenti al)
SYMB OL
BER
lcc
lcc
Isurge
350
2
720
180
MIN
TYP
MAX
1E-12
250
300
+30
2000
165
0.8
mA
mA
mA
mVpp
ohms
U N ITS
N OTES
Errors/Bi t @ Pr mi n
T = 25°C , Vcc = 5.0 V
a
®
Ta = 25° C, Vcc = 5.0 V
0° C <T < 70°C , 4.5 V< Vcc <5.5V
a
Surge above steady state value
AC coupled i nputs
Input Impedance (D i fferenti al)
Tx_D ISABLE Input Voltage - Hi gh
Tx_D ISABLE Input Voltage - Low
Tx_FAULT output voltage -- hi gh
Tx_FAULT output voltage -- low
R EC EIVER
PEC L Output (D i fferenti al)
Output Impedance (D i fferenti al)
Rx_LOS Output Voltage - Hi gh
Rx_LOS Output Voltage - Low
T tal Ji tter [ Pk - Pk ]
o
Output Ri se/Fall ti me
MOD _D EF ( 0:2 )
PERFORMANCE SPECIFICATIONS - OPTICAL 850 nm Laser Multimode
PAR AMETER
FIB ER LEN GTH
50
µ
m C ore D i ameter MMF
62.5
µ
m C ore D i ameter MMF
TR AN SMITTER
Opti cal Transmi t Power
D i sabled Power level
Opti cal C enter
Spectral Wi dth
Exti ncti on Rati o
Relati ve Intensi ty Noi se
Total Ji tter [ pk - pk]
Output Ri se, Fall Ti me
R EC EIVER
Opti cal Input
Opti cal Input Power
Opti cal Return Loss
RX_LOS- Asserted
RX_LOS - D easserted
RX_LOS - Hysteresi s
SYMB OL
MIN
300
200
-10
TYP
500
300
MAX
Note1 - Measured with 2
7
-1 pseudorandom bit sequence.
Note2 - Host Vcc
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Zi n
135
0
150
Ri n > 100 kohms @ D C
Vi H
V
DD
T+0.3
Vcc+0.3
0.5
V
Vi L
V
VtoH
VtoL
Vcc-0.5
0
V
Io = 400µA; Note 2
V
Io = -4.0mA
400
750
1600
165
0.5
85
mVpp
ohms
V
V
AC coupled outputs
Zout
135
0
150
VroH
VroL
TJ
tr,tf
Vcc-0.5
Vcc+0.3
lo = 400µA; Note 2
lo = -4.0mA
20% - 80%
ps
V
100
2.5
0
300
0.5
ps
V
VoH
VoL
NC
Wi th Seri al ID
100K
ohms
Measured to RGND /TGND
Ta = 25° C, Vcc = 5.0 V
U N ITS
N OTES
m
m
BER < 1.0E-12 @ 2.125 GBaud
BER < 1.0E-12 @ 2.125 GBaud
P opt
Poff
λ
∆λ
ER
RIN
TJ
t
R
, t
F
830
9
850
10
-5
-35
860
4
-118
105
220
860
0
dB m
dB m
nm
nm
dB
dB/Hz
ps
ps
average @ 850 nm
TX_D ISABLE acti ve
RMS
P1/P0
20% - 80%
λ
Pr
ORL
Pa
Pd
Pa - Pd
770
-16
12
-29
30
1.5
-16
5.0
nm
dB m
dB
dB m
dB m
dB
BER < 1.0E-12 See Note 1
measured on transi ti on - low to hi gh
measured on transi ti on - hi gh to low
9245.01
MGBC-20-8-X-S Optical Fibre Channel
Gigabit Interface Converter (GBIC) - 2.125GBaud
MGBC-20-8-2 PERFORMANCE SPECIFICATIONS - OPTICAL 1300 nm Laser Single Mode
®
Ta=25°C, Vcc=5V
PARAMETER
FIBER LENGTH
9.0
µ
m Core Diameter SMF
TRANSMITTER
Optical Center
Extinction Ratio
SYMBOL
MIN
2
TYP
5
1310
10
MAX
UNITS
km
NOTES
BER < 1.0E-12 @ 2.125 GBaud
Disabled Power level
RMS Spectral Width
Optical Transmit Power
RECEIVER
Optical Input Power
RX_LOS - Asserted
RX_LOS - Deasserted
RX_LOS - hysteresis
MGBC-20-8-2M PERFORMANCE SPECIFICATIONS - OPTICAL 1300 nm Laser Single Mode
PARAMETER
FIBER LENGTH
9.0
µ
m Core Diameter SMF
TRANSMITTER
Optical Center
Extinction Ratio
SYMBOL
MIN
10
TYP
20
MAX
UNITS
km
nm
Disabled Power level
RMS Spectral Width
Optical Transmit Power
RECEIVER
Optical Input Power
RX_LOS - Asserted
RX_LOS - Deasserted
RX_LOS - Hysteresis
MGBC-20-8-2L PERFORMANCE SPECIFICATIONS - OPTICAL 1300 nm Laser Single Mode
PARAMETER
FIBER LENGTH
9.0 mm Core Diameter SMF
TRANSMITTER
Optical Center
Extinction Ratio
Y
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N
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λ
ER
1270
9
1355
-35
4
-3
nm
dB
P1/P0
RMS
Poff
dB m
nm
TX_DISABLE active
∆λ
P opt
-12
dB m
average @ 1310 nm
Pr
Pa
Pd
Pa-Pd
-18
-29
-3
1.5
-18
5.0
dB m
dB m
dB m
dB
NOTES
BER < 1.0E-12 @ 2.125 GBaud
λ
ER
1285
9
1310
10
1335
-35
3
-3
dB
P1/P0
RMS
Poff
dB m
nm
TX_DISABLE active
∆λ
P opt
-9.5
-19
-29
dB m
average @ 1310 nm
Pr
Pa
Pd
Pa-Pd
-3
1.5
-19
5.0
dB m
dB m
dB m
dB
average power for BER < 1.0E-12
Measured on transition - low to high
Measured on transition - high to low
Ta=25°C, Vcc=5V
average power for BER < 1.0E-12
Measured on transition - low to high
Measured on transition - high to low
Ta=25°C, Vcc=5V
SYMBOL
MIN
20
TYP
25
MAX
UNITS
km
NOTES
BER < 1.0E-12 @ 2.125 GBaud
λ
ER
1300
9
1310
10
1320
-35
2
nm
dB
P1/P0
RMS
Disabled Power level
RMS Spectral Width
Optical Transmit Power
RECEIVER
Optical Input Power
RX_LOS - Asserted
RX_LOS - Deasserted
RX_LOS - Hysteresis
Poff
∆λ
P opt
Pr
Pa
Pd
Pa-Pd
-7
-20
-29
1.5
dB m
nm
dB m
dB m
dB m
dB m
dB
TX_DISABLE active
average @ 1310 nm
average power for BER < 1.0E-12
Measured on transition - low to high
Measured on transition - high to low
-3
-3
-20
5.0
9245.01
MGBC-20-8-X-S Optical Fibre Channel
Gigabit Interface Converters (GBIC) - 2.125GBaud
®
TERMINATION CIRCUITS
Inputs to the MGBC-20 transmitter are AC coupled and internally terminated through 75 ohms to AC ground. These
modules can operate with PECL or ECL logic levels. The input signal must have at least a 350mV peak-to-peak (single
ended) signal swing. Output from the receiver section of the module is also AC coupled and is expected to drive into a
75 ohm load. Different termination strategies may be required depending on the particular Serializer/Deserializer chip
set used.
The MGBC-20 product family is designed with AC coupled data inputs and outputs to provide the
following advantages:
n
Close positioning of SERDES with respect to transceiver; allows for shorter line lengths and at
gigabit speeds reduces EMI.
n
Minimum number of external components.
n
Internal termination reduces the potential for unterminated stubs which would otherwise increase
jitter and reduce transmission margin.
Subsequently, this affords the customer the ability to optimally locate the SERDES as close to the MGBC-20 as
possible and save valuable real estate. At gigabit rates this can provide a significant advantage resulting in better
transmission performance and accordingly better signal integrity.
Figure 1 illustrates the recommended transmit and receive data line terminations.
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FIGURE 1: Example of termination circuits for Drivers and Receivers in the host and the GBIC
9245.01
MGBC-20-8-X-S Optical Fibre Channel
Gigabit Interface Converter (GBIC) - 2.125GBaud
POWER COUPLING
®
A suggested layout for power and ground connections is given in figure 2A below. Connections are made via separate voltage
and ground planes. The mounting posts are at case ground and should not be connected to circuit ground. The ferrite bead
should provide a real impedance of 50 to 100 ohms at 100 to 1000 MHz. Bypass capacitors should be placed as close to the
20 pin connector as possible.
Figure 2A. Suggested Power Coupling
SIGNAL DESCRIPTION:
TX_FAULT:
Active high signal. A TX_FAULT is defined as the failure of the optical output of the GBIC and it is internally latched.
On the rising edge of the TX_DISABLE, the latched laser fault will be cleared and TX_FAULT will remain deasserted while
TX_DISABLE is asserted. The host shall provide a 4.7K to 10K Ohm pull up resistor to Vcc. The TX_FAULT will also be as-
serted but not latched if the Vcc falls below the lower Vcc limit.
TX_DISABLE
:
Active high logic input which disables the optical output. This signal is driven by the host. While asserted, the
GBIC module disables all laser light output. This pin is internally pulled up to Vcc through a 10K Ohm resistor for short wave-
length and a 4.7K Ohm resistor for long wavelength. The TX_DISABLE must be pulled low or connected to circuit ground by the
host to enable the GBIC output.
RX_LOS
:
The RX_LOS signal is intended as a preliminary indication to the system in which the GBIC is installed that the link
signals are likely to be outside the required values for proper operation. Such indications typically point to non-installed cables,
broken cables, or a disabled, failing or powered off transmitter at the far end of the cable. Additional indications are provided by
the system in which the GBIC is installed to verify that the information being transmitted is valid, correctly encoded and in the
correct format. Such additional indications are outside the scope of the GBIC specification. RX_LOS will also be asserted if the
Vcc falls below the lower Vcc limit. The host shall provide a 4.7k to 10k Ohm pullup resistor to Vcc.
RGND
Receiver ground. It is internally connected to TGND plane.
TGND
Transmitter ground. It is internally connected to RGND plane.
±RX_DAT
High speed serial differential PECL receiver data.
±TX_DAT
High speed serial differential PECl transmit data.
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BOTTOM VIEW
Figure 2B. Suggested Power Coupling
9245.01
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