EELXT901APC.A4 S L8L5 Cortina Systems Inc, EELXT901APC.A4 S L8L5 Datasheet - Page 19

• Manufacturer Part Number: EELXT901APC.A4 S L8L5
• Manufacturer: Cortina Systems Inc

Specifications of EELXT901APC.A4 S L8L5

• Lead Free Status / RoHS Status: Compliant

2.5.1
3.0
3.1
Datasheet
Document #: 249097
Revision #: 002
Rev. Date: June 19, 2001
NOTES:
1. For Remote Link-Down (RLD) signaling, the interval between LI pulses increments from 10 ms to 15 ms, and then the cycle
2. For Remote Jabber (RJAB) signaling, the interval between LI pulses decrements from 20 ms to 15 ms to 10 ms, and then the
3. For Remote Compatibility (RCMPT) signaling, the interval between LI pulses continually switches between 10 ms and 20 ms.
LI-RCMPT
LI-RJAB
LI-RLD
(note 1)
(note 2)
starts over.
cycle starts over.
Figure 8. Remote Signaling Link Integrity Pulse Timing
(note 3)
Remote Signaling
The LXT901/907 transmits standard link pulses which meet the IEEE 802.3 10BASE-T
specification. However, the LXT901/907 encodes additional status information into the link pulse
by varying the link pulse timing. This is referred to as remote signaling. Using alternate pulse
intervals, the LXT901/907 can signal three local conditions: link down, jabber, and remote
signaling compatibility.
other end of the line. The LXT901/907 also recognizes these alternate pulse intervals when
received from a remote unit. Remote status conditions are reported to the controller over the RLD,
RJAB and RCMPT output pins.
Application Information
Twisted-Pair Impedance Matching
Resistors must be installed on each input and output pair to match impedance of the network media
being used. The LXT907 is configured with 100 termination for Unshielded Twisted-Pair (UTP).
In this case, the positive and negative sides of both output pairs are shorted together (TPOPA/
TPOPB and TPONA/TPONB) and tied to the transformer through a 24.9 1% series resistor.
10 ms
10 ms
20 ms
15 ms
ms
20
15 ms
20 ms
ms
10
Figure 8
ms
10
Universal 10BASE-T and AUI Transceivers — LXT901/907
20 ms
shows the interval variations used to signal local status to the
ms
10
20 ms
15 ms
ms
10
15 ms
20 ms
20 ms
ms
10
ms
ms
10
10
20 ms
15 ms
20 ms
15 ms
20 ms
ms
10
907F07.VSD
ms
10
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