MGBC-20-3-X-X Optical ATM OC-12
Gigabit Interface Converter (GBIC)
Features
®
ORDERING INFORMATION
MGBC - 20 - 3 - X - X
SERIAL IDENTIFICATION OPTION
Blank
- No Serial ID
S
- Serial ID
WAVELENGTH
1
- 850nm ( multimode )
2
- 1300nm (single mode) 20km
COMMUNICATIONS PROTOCOL
3
- ATM OC-12, 622MBaud
4
- Gigabit Ethernet 1.25 GBaud
6
- Fibre Channel 1.0625 GBaud
8
- Fibre Channel, 2.125GBaud
n
Compliant with Gigabit Interface Converter
(GBIC) specification
n
Compliant With ATM OC-12 specification for optical
links
n
75Ω AC coupled PECL termination lines
n
Hot pluggable
n
Single +5V Power Supply
n
Supports Serial ID functionality
PRODUCT OVERVIEW
The MGBC-20-3 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 is specifically
designed for high speed ATM OC-12 data links at
622Mbps. 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 1km over 50µm multimode optical fiber with
data transfer rates of 622GBaud.
LONG WAVELENGTH LASER
The MGBC-20-3-2 is provided with single mode optics.
The 1300nm laser provides highly reliable single mode
communications which meets or exceeds the ATM
distance reqruirements.
Optoelectronic Products
7444 W. Wilson Ave • Chicago • IL 60656
708/867-9600 • 800/323-6858 • Fax: 708/867-0996
email: optoinfo@methode.com
MODULE SPECIFICATIONS - ABSOLUTE MAXIMUM RATINGS
PARAMETER
Storage Temperature
Supply Voltage
Data AC Voltage
Data DC Voltage
PARAMETER
Ambient Operating Temperature
Supply Voltage
Baud Rate
SYMBOL
Tstg
V
DD
T, V
DD
R
Tx+, Tx-
Tx+, Tx-
SYMBOL
Ta
V
DD
T, V
DD
R
BRate
MIN
-40
-10
MIN
0
4.75
MAX
85
6.00
2.6
10
TYP
5.00
622
UNITS
°C
V
V pp
V pk
MAX
70
5.25
NOTES
V
DD
- ground
Differential
V (Tx+ or Tx-) - ground
NOTES
MODULE SPECIFICATION - RECOMMENDED OPERATING CONDITIONS
UNITS
°C
VD C
MBaud
±100ppm
0097.01
MGBC-20-3-X-X Optical ATM OC-12
Gigabit Interface Converters (GBIC)
PERFORMANCE SPECIFICATIONS - ELECTRICAL
®
Ta = 25° C, Vcc = 5.0 V
PARAMETER
Bit Error Rate
Supply Current
Surge Current
TRANSMITTER
PECL Input (Differential)
Input Impedance (Differential)
Tx_DISABLE Input Voltage - High
Tx_DISABLE Input Voltage - Low
Tx_FAULT output voltage -- high
Tx_FAULT output voltage -- low
RECEIVER
PECL Output (Differential)
Output Impedance (Differential)
Rx_LOS Output Voltage - High
Rx_LOS Output Voltage - Low
Interface Jitter [ Pk - Pk ]
MOD_DEF ( 0:2 )
SYMBOL
BER
lcc
lcc
Isurge
MIN
TYP
180
MAX
1E-12
250
300
+30
UNITS
mA
mA
mA
mVpp
ohms
V
V
V
mVpp
ohms
V
V
ps
V
V
ohms
NOTES
Errors/Bit @ Pr min
Ta = 25°C, Vcc = 5.0 V
0° C <Ta< 70°C, 4.5 V< Vcc <5.5V
Surge above steady state value
AC coupled inputs
Rin > 100 kohms @ DC
350
Zin
Vi H
Vi L
VtoH
VtoL
135
2
0
Vcc-0.5
0
400
Zout
VroH
VroL
TJ
VoH
VoL
NC
2.5
0
100K
135
Vcc-0.5
0
720
150
2000
165
0.8
Vcc+0.3
0.5
V
DD
T+0.3 V
Io = 400µA; Note 2
Io = -4.0mA
AC coupled outputs
lo = 400µA; Note 2
lo = -4.0mA
See Note 1
With Serial ID
Measured to RGND/TGND
Ta = 25° C, Vcc = 5.0 V
UNITS
m
m
-4
850
10
-116
350
350
860
.85
9
dB m
nm
nm
dB
dB/Hz
ps
ps
nm
dB m
dB
dB m
dB m
dB
BER < 1.0E-12
measured on transition - low to high
measured on transition - high to low
See note 1
20% - 80%
RMS
P1/P0
NOTES
BER < 1.0E-12 @ 622 GBaud
BER < 1.0E-12 @ 622 GBaud
average @ 850 nm
750
150
1600
165
Vcc+0.3
0.5
550
0.5
PERFORMANCE SPECIFICATIONS - OPTICAL 850 nm Laser Multimode
PARAMETER
SYMBOL
MIN
TYP
MAX
FIBER LENGTH
50
µ
m Core Diameter MMF
62.5
µ
m Core Diameter MMF
TRANSMITTER
Optical Transmit Power
Optical Center
Spectral Width
Extinction Ratio
Relative Intensity Noise
Interface Jitter [ pk - pk]
Output Rise, Fall Time
RECEIVER
Optical Input
Optical Input Power
Optical Return Loss
RX_LOS- Asserted
RX_LOS - Deasserted
RX_LOS - Hysteresis
λ
Pr
ORL
Pa
Pd
Pa - Pd
770
-16
12
-29
1.5
-16
5.0
30
860
0
P opt
λ
∆λ
ER
RIN
TJ
t
R
, t
F
-10
840
1000
750
Note1 - Measured with 2
23
-1 pseudorandom bit sequence.
Note2 - Host Vcc
0097.01
MGBC-20-3-X-X Optical ATM OC-12
Gigabit Interface Converter (GBIC)
®
MGBC-20-3-2 PERFORMANCE SPECIFICATIONS - OPTICAL 1300 nm Laser Single Mode
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS NOTES
Ta=25°C, Vcc=5V
FIBER LENGTH
9.0
µ
m Core Diameter SMF
TRANSMITTER
Optical Center
Extinction Ratio
RMS Spectral Width
Optical Transmit Power
RECEIVER
Optical Input Power
RX_LOS - Asserted
RX_LOS - Deasserted
RX_LOS - hysteresis
Pr
Pa
Pd
Pa-Pd
1.5
-28
-34
-28
5.0
-8
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
λ
ER
∆λ
P opt
-15
1270
9
1310
10
4
-8
1355
nm
dB
nm
dB m
P1/P0
RMS
average @ 1310 nm
20
30
km
BER < 1.0E-12 @ 622MBaud
0097.01
MGBC-20-3-X-X Optical ATM OC-12
Gigabit Interface Converters (GBIC)
®
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 325mV 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.
FIGURE 1: Example of termination circuits for Drivers and Receivers in the host and the GBIC
0097.01
MGBC-20-3-X-X Optical ATM OC-12
Gigabit Interface Converter (GBIC)
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.
BOTTOM VIEW
+
Figure 2A. Suggested Power Coupling
Figure 2B. 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.
0097.01
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