Cisco 15454-GBIC-59.7= Datasheet download pdf (Page 2)

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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.

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Cisco 15454-GBIC-59.7= Datasheet Page 2