V23848-N15-C56

V23848-N15-C456

Description

Preliminary Product Information

6

2004-06-22

The transceiver contains a supervisory circuit to control 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 140 milliseconds after the voltage

has risen above the reset threshold. During this time the laser is inactive.

A low signal on TxDis enables transmitter. If TxDis is high or not connected the

transmitter is disabled.

An enhanced Digital Diagnostic Monitoring Interface (Intelligent) has been incorporated

into the Infineon Small Form-factor Pluggable (SFP) transceiver. This allows real time

access to transceiver operating parameters, based on the SFF-8472.

This transceiver features Internal Calibration. Measurements are calibrated over

operating temperature and voltage and must be interpreted as defined in SFF-8472.

The transceiver generates this diagnostic data by digitization of internal analog signals

monitored by a new diagnostic Integrated Circuit (IC).

This diagnostic IC has inbuilt sensors to include alarm and warning thresholds. These

threshold values are set during device manufacture and therefore allow the user to

determine when a particular value is outside of its operating range.

Alarm and Warning Flags are given. Alarm Flags indicate conditions likely to be

associated with an inoperational link and cause for immediate action. Warning Flags

indicate conditions outside the normally guaranteed bounds but not necessarily causes

of immediate link failures.

These enhanced features are in addition to the existing SFP features provided by the

manufacturer i.e. serial number and other vendor specific data.

The serial ID interface defines a 256 byte memory map in EEPROM, accessible over a

2 wire, serial interface at the 8 bit address 1010000X (A0h).

The Digital Diagnostic Monitoring Interface makes use of the 8 bit address 1010001X

(A2h), so the originally defined serial ID memory map remains unchanged and is

therefore backward compatible.

Digital Diagnostic Monitoring Parameters

Parameter

Accuracy SFF-8472

Accuracy Actual

Tx Optical Power

±3 dB

±3 dB

Rx Optical Power

±3 dB

±3 dB

Bias Current

±10%

±10%

Power Supply Voltage

±3%

±3%

Transceiver Temperature

±3°C

±3°C