SLXT973QC.A2 Intel, SLXT973QC.A2 Datasheet - Page 56



Manufacturer Part Number

Specifications of SLXT973QC.A2

Lead Free Status / RoHS Status
Not Compliant
LXT973 10/100 Mbps Dual-Port Fast Ethernet PHY Transceiver
Fiber Interface
The fiber ports of the LXT973 are designed to connect to common industry standard fiber modules.
The fiber ports incorporate PECL receivers and drivers, allowing for seamless integration. The
LXT973 provides a separate pin for the signal detect function. If designers wish to implement this
feature, they need to provide a separate signal for this function. If the signal quality starts to
degrade, this pin is essentially used to detect a remote fault condition and signals it accordingly.
Loss of signal quality also blocks any fiber data from being received and causes a loss of link.
The remote fault code consists of 84 consecutive ones followed by a single zero. This pattern must
be repeated at least three times. The LXT973 transmits the remote fault code a minimum of three
times if all the following conditions are true:
The remote fault (Register bit 1.4) is set when the LXT973 is either actively transmitting a remote
fault or if the LXT973 has received a remote fault from its link partner. The transmitted remote
fault can come from the above conditions if auto-negotiation is not enabled. If auto-negotiation is
enabled, the transmitted remote fault condition is indicated by Register bit 4.13 in the Auto-
Negotiation Advertisement Register. Likewise, a remote fault can be set by the LXT973’s link
partner in two ways. If auto-negotiation is enabled, Register bit 5.13 is set in the Auto-Negotiation
Link Partner Ability Register. If auto-negotiation is disabled, the remote fault condition is set by
the remote fault code being received on the fiber inputs.
A register bit has been provided that either selects normal, unscrambled fiber data, or scrambles the
transmitted fiber data (Register bit 26.10).
When in loopback mode, the remote fault condition is not transmitted.
1. Signal Detect indicates no signal
2. Far End Fault Enable bit (Register bit 16.2 Test Register) is set
3. Auto-negotiation is not enabled
4. Fiber mode is selected
Rev. Date: March 1, 2002
Document #: 249426
Revision #: 002

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