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LXT9883/9863 — Advanced 10/100 Unmanaged Repeater

Datasheet

Document #: 249115

Revision #: 003

Rev. Date: 08/07/01

3.6.6.4

LED Mode 4

Mode 4 operations are described in Table 14.

3.7

IRB Operation

The Inter-Repeater Backplane (IRB) allows multiple devices to operate as a single logical repeater,

exchanging data and collision status information. Each segment on the LXT98x3 has its own

complete, independent IRB. The backplanes use a combination of digital and analog signals as

shown in Figure 8 on page 30.

3.7.1

IRB Signal Types

IRB signals can be characterized by the following connection types (For Stacking and Cascading

connections, see Table 15 on page 30):

• Local—connected between devices on the same board

• Stack—connected between boards

• Full—connected between devices in the same board and between boards.

Table 14. LED Mode 4 Indications

LED

Operating Mode

Hardware Control

Blink

Off

PORTnLED1

10 Mbps operation

Link_OK, not Port_Partitioned

20 ms Blink

indicates

Rcv_Activity

Any other state

100 Mbps operation

Any other state

PORTnLED2

10 Mbps operation

Link_OK, Port_Partitioned

N/A

Any other state

100 Mbps operation

PORTnLED3

AUTOBLINK active

100M Link_OK

No Link_OK

(Fast Blink))

10M Link_OK

AUTOBLINK inactive

N/A

Collision and

Activity LEDs

Any

The collision and activity LEDs are on a Per Segment basis. Pulse

stretchers are used to extend the on-time for the LEDs. For every on-cycle

of the stretched LEDs, an off-cycle, with the same period as the on-cycle,

always follows.

The collision LEDs turn on for approximately 120

µs when the LXT98x3

detects a collision on the segments. During the time that the LED is on, any

additional collisions are ignored by the collision LED logic.

The activity LEDs turns on for approximately 4 ms when the LXT98x3

detects any activity on the segments. During the time that the LED is on,

any additional activity is ignored by the activity LED logic.

Global

Fault

Any

Any port partitioned or

RPS_Fault and

RPS_ Present

N/A

Any other state

RPS Fault

Any

RPS_Fault and

RPS_ Present

1. Refer to Table 10: LED Terms, which defines all key terms used in this section.

2. Receive activity is stretched to a 20 ms wide pulse. For every on-cycle of the stretched LEDs, an off-cycle, with the same

period as the on-cycle, always follows.

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