currents are eliminated by using a special slow start circuit
and two-stage contact sequence where operational signals and
grounds make contact prior to the power supply (as specified
in the GBIC specification, Rev. 5.5).
Electrical interface:
All signal interfaces are compliant with
the GBIC specification, Rev. 5.5. The high speed DATA
interface is differential AC-coupled and can be directly
connected to either a 5V or 3.3V SERDES IC. All low speed
control and sense input/output signals are open collector TTL
compatible and should be pulled up with a 4.7 - 10kΩ resistor
on the host board.
Loss of Signal (LOS):
The Loss of Signal circuit monitors the
level of the incoming optical signal and generates a logic HIGH
when an insufficient photocurrent is produced.
TX_FAULT:
The output indicates LOW when the transmitter
is operating normally, and HIGH when the transmitter or laser
current is excessive. TX_FAULT is an open collector/drain
output and should be pulled up with a 4.7 - 10kΩ resistor on
the host board.
TX_DISABLE:
When the TX_DISABLE pin is at logic HIGH,
the transmitter optical output is disabled (less than -35dBm).
Serial Identification:
The DTR-1250-SM-GB-I transceivers
are compliant with Annex D (Module Definition 4) of the GBIC
specification, Rev. 5.5, which defines the Serial Identification
Protocol.
The module definition of GBIC is indicated by the three module
definition pins, MOD_DEF(0), MOD_DEF(1) and MOD_DEF(2).
Module Definition 4 specifies a serial definition protocol with
a two-wire I
2
C serial interface; upon power up, MOD_DEF(1:2)
appear as NC (no connection), and MOD_DEF(0) is TTL LOW.
When the host system detects this condition, it activates the
serial protocol and generates the serial clock signal (SCL). The
positive edge clocks data into the EEPROM segments of the
GBIC that are not write protected, and the negative edge clocks
data from the GBIC.
The serial data signal (SDA) is for serial data transfer. The host
uses SDA in conjunction with SCL to mark the start and end of
serial protocol activation.
The data transfer protocol and the details of the mandatory and
vendor specific data structures are defined in Annex D of the
GBIC specification, Rev. 5.5.
Power supply and grounding:
The power supply line should
be well-filtered. All 0.1µF power supply bypass capacitors
should be as close to the GBIC transceiver module as possible.
4
21737-0390, Rev. B
10-16-2003
DTR-1250-SM-GB-I
Package Outline
12
.472
12.7
.500
8.9
.35
1
2X .04
37.1 MAX
1.46 MAX
25.4
1.000
8.18
.322
1.27 0
- 0.10
+
2X .050 - .000
.004
13.54 MAX
.533 MAX
1.63 - 0
0.10
+
.000
.064 -.004
GUIDE
SLOTS
HEIGHT
PIN 10
PIN 1
3.05+0.05
.120 + .002
58 MAX
2.28 MAX
PIN 20
27.7
1.09
GUIDE SLOTS WIDTH
+0.04
10.06 - 0.20
.002
.396+
-.008
0
30.48 - 0.13
+.000
1.200 - .005
Dimensions in inches [mm]
Default tolerances:
.xxx = + .005”, .xx = + .01”
Ordering Information
Model Name
DTR-1250-SM-GB-H3-I
DTR-1250-SM-GB-H5-I
DTR-1250-SM-GB-H7-I
DTR-1250-SM-GB-H8-I
1
Nominal Wavelength
1310nm
1550nm
1550nm
1550nm
Optical Link Power Budget
19dB min.
21dB min.
22dB min.
24dB min.
Distance
1
42km
2
68km
3
72km
3
80km
3
The indicated transmission distance is for guidelines only, not guaranteed. The exact distance is dependent on the fiber loss, connector and
splice loss, and allocated system penalty. Longer distances can be supported if the optical link power budget is satisfied.
2
Assuming a total connector and splice loss of 2dB, total system penalty of 2dB and fiber cable loss of 0.35dB/km.
3
Assuming a total connector and splice loss of 2dB, total system penalty of 2dB and fiber cable loss of 0.25dB/km.
Optical Communication Products, Inc.
6101 Variel Avenue, Woodland Hills, CA 91367, Tel.: 818-251-7100, FAX: 818-251-7111, www.ocp-inc.com
Optical Communication Products, Inc. reserves the right to make changes in equipment design or specifications without notice. Information supplied by Optical Communication
Products, Inc. is believed to be accurate and reliable. However, no responsibility is assumed by Optical Communication Products, Inc. for its use nor for any infringements
of third parties, which may result from its use. No license is granted by implication or otherwise under any patent right of Optical Communication Products, Inc.
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