Product Change Notification #XXXX
QLA2342 Configuration Option
Transmit Disable
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Distribution:OEM Customers
Change Notification #:
Date:January 13, 2004
Type of Change Notification:Configuration Option
Please review the following Change Notification. QLogic requests its Customer to acknowledge receipt of the PCN within10 business days to .
To order qualification samples please contact your QLogic Sales representative as soon as possible to place your order.
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Reason for Change:
The purpose of providing this configuration option is to allow customers to disable the transmit laser output for optical transceivers when power is applied to the HBA. In a few isolated instances, the output laser may transmit unrecognized data to connected devices, impacting the performance and functionality of the device. With the transmit laser disabled (during power on) and controlled through firmware, customers can control the exact time period that a laser is expected to be on.
Description of Change:
The QLA2342 includes two connectors (J3 & J4) that controls the transmit laser for optical transceivers. Each connector has two jumper positions, connecting pins 1 and 2 or connecting pins 2 and 3. By default, the two connectors connect pins 2 and 3, thereby enabling the transmit laser whenever power is on.
By moving the jumper connector to the other position (connecting pins 1 and 2), the transmit laser is disabled when power is applied. Firmware must now control the transmit on/off function of the laser. Please note that only specific firmware versions will support this function.
Please see diagram 1 below for detailed descriptions of each jumper and related pins.
Customer Impact of Change:
This configuration option impacts all customers who want to disable the output laser at boot-up and prefer to control this function through firmware. Customers who want this function must manually change the jumper position for the two connectors (J3 & J4) and ensure the appropriate firmware version is installed. By disabling the transmit laser output (during power on), the likelihood of the output laser interfering with any connected devices is minimized.
Reference Documents/Attachments:
Diagram 1 – QLA2342 Connectors and Jumper Pins
PCN Revision History:
Date of Revision:Revision Number:Reason
01/13/04PCN DraftConfiguration Option
PCN - QLA2342 TXDisQLogic RestrictedPage 1 of 3