The Infineon single mode ATM transceiver complies with the ATM Forum's Network
Compatible ATM for Local Network Applications document and ANSI's Broadband
ISDN - Customer Installation Interfaces, Physical Media Dependent Specification,
T1.646-1995, Bellcore-SONET OC-3/LR-1 and ITU-T G.957 STM-1/L.1.1.
ATM was developed to facilitate solutions in multimedia applications and real time
transmission. The data rate is scalable, and the ATM protocol is the basis of the
broadband public networks being standardized in the International Telecommunications
Union (ITU), the former International Telegraph and Telephone Consultative Committee
(CCITT). ATM can also be used in local private applications.
The Infineon single mode ATM long haul transceiver is a single unit comprised of a
transmitter, a receiver, and an SC receptacle. This design frees the customer from many
alignment and PC board layout concerns. The module is designed for low cost WAN
applications. It can be used as the network end device interface in workstations, servers,
and storage devices, and in a broad range of network devices such as bridges, routers,
intelligent hubs, and wide area ATM switches.
This transceiver operates at 155.520 Mbit/s from a single power supply (+5 V or +3.3 V).
The differential data inputs and outputs are PECL compatible.
Functional Description
This transceiver is designed to transmit serial data via single mode cable.
Signal Monitor and
Automatic Shut-Down
TD
TD
RD
RD
SD
LEN
Laser
Driver
Power
Control
Monitor
Receiver
ISM
Laser Coupling Unit
e/o
Laser
o/e
Single Mode Fiber
RX Coupling Unit
o/e
Figure 2Functional Diagram
Data Sheet32000-03-01
V23826-C18-C64
V23826-C18-C364
Description
The transmitter converts electrical PECL compatible serial data (TD and TDnot) into
optical serial data. It contains a laser driver circuit that drives the modulation and bias
current of the laser diode. The currents are controlled by a power control circuit to
guarantee constant output power of the laser over temperature and aging.
The power control uses the output of the monitor PIN diode (mechanically built into the
laser coupling unit) as a controlling signal, to prevent the laser power from exceeding the
operating limits.
This transceiver contains an Input Signal Monitor (ISM), that switches the optical power
off if a continuously low level is applied at Data Input.
The receiver component converts the optical serial data into PECL compatible electrical
data (RD and RDnot). The Signal Detect (SD, active high) shows whether optical data is
1)
present
.
This module is a Class 1 laser product, due to an integrated automatic shutdown circuit
that disables the laser when it detects transmitter failures.
Single fault condition is ensured by means of an integrated automatic shutdown circuit
that disables the laser when it detects transmitter failures. A reset is only possible by
turning the power off, and then on again.
The transceiver contains a supervisory circuit to monitor the power supply. This circuit
makes an internal reset signal whenever the supply voltage drops below the reset
threshold. It keeps the reset signal active for at least 15 milliseconds after the voltage
has risen above the reset threshold. During this time the laser is inactive.
1)
We recommend to switch off the transmitter supply (VCC - Tx) if no transmitter input data is applied.
Data Sheet4 2000-03-01
V23826-C18-C64
V23826-C18-C364
Regulatory Compliance
FeatureStandardComments
Electrostatic Discharge
(ESD) to the Electrical
Pins
Immunity:
Electrostatic Discharge
(ESD) to the Duplex SC
Receptacle
Immunity:
Radio Frequency
Electromagnetic Field
Emission:
Electromagnetic
Interference (EMI)
MIL-STD 883C
Method 3015.4
EN 61000-4-2
IEC 61000-4-2
EN 61000-4-3
IEC 61000-4-3
FCC Class B
EN 55022 Class B
CISPR 22
Class 1 (>1000 V)
Discharges of ±15 kV with an air
discharge probe on the receptacle
cause no damage.
With a field strength of 10 V/m rms,
noise frequency ranges from 3 MHz
to 1 GHz. No effect on transceiver
performance between the
specification limits.
Noise frequency range:
30 MHz to 6 GHz, margins depend
on PCB layout and chassis design.
Description
Data Sheet52000-03-01
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