Cisco OC-48/STM-16, SR1, 1310 nm, SFP, I-Temp ONS-SI-2G-S1= Benutzerhandbuch
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ONS-SI-2G-S1=
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© 2009 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information.
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Technical Overview
SFP Module
The SFP transceiver module (Figure 1) is a bidirectional device with a transmitter and receiver in the same physical
package. The module interfaces to the network through a connector interface on the electrical ports and through an
LC termination connector on the optical ports. Electrical interfaces and dimensions are defined in the SFF-8472
industry-standard multisource agreement (MSA).
Figure 1. SFP Transceiver Modules for the Cisco ONS Family
A schematic of the SFP transceiver module functional block diagram is illustrated in Figure 2. It contains three parts:
the transmitter, receiver, and Electrically Erasable Programmable Read-Only Memory (EEPROM) storage chip. This
block diagram is intended for information purposes only and does not illustrate design requirements.
Transmitter
In the transmit direction, the SFP transceiver module receives the electrical signal and transmits this data in an
optical signal by using a laser driver that controls the laser diode. The optical output power is held constant by an
automatic power control circuit.
Receiver
In the receive direction, the SFP transceiver module receives an NRZ optical signal and converts it to an electrical
equivalent. The receive portion of the module will use some kind of amplifier to control the converted electrical
signal.
EEPROM
This type of SFP transceiver is identified by the standard two-wire serial interface used in EEPROM with an I2C
interface (with serial ID functions) that is part of the GBIC specifications and the SFF-8472 MSA. In addition,
EEPROM offers an enhanced monitoring interface for optical transceivers as described in SFF-8472, which allows
real-time access to the device to enable monitoring of received optical power, laser bias current, laser optical output
power, etc.