MB86961A Просмотр технического описания (PDF) - Fujitsu

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MB86961A

UNIVERSAL INTERFACE FOR 10BASE -T

Fujitsu 

MB86961A

REMOTE SIGNALING

The MB86961A transmits standard link pulses which

meet the 10BASE-T specification. However, the

MB86961A 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 MB86961A can signal three local condi-

tions: link down, jabber, and remote signaling capability.

Figure 11 shows the interval variations used to signal

local status to the other end of the line. The MB86961A

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.

10ms 15ms

20ms

10ms 15ms

20ms

10ms 15ms

20ms

LI-RLD1

20ms

15ms 10ms

20ms

15ms 10ms

20ms

15ms 10ms

LI-RJAB2

LI-RCMPT3

10ms

20ms

10ms

20ms

10ms

20ms

10ms

20ms

Notes: 1. For Remote Link Down (RLD) signaling, the interval between LI pulses increments from

10 ms to 15 ms to 20 ms, and then the cycle starts over.

2. For Remote Jabber (RJAB) signaling, the interval between LI pulses decrements from 20

ms to 15 ms to 10 ms, and then the cycle starts over.

3. For Remote Compatibility (RCMPT) signaling, the interval between LI pulses continually

switches between 10 ms and 20 ms.

Figure 11. Remote Signaling Link Integrity Pulse Timing

15

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