AK2504A Просмотр технического описания (PDF) - Asahi Kasei Microdevices

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AK2504A

DS3/STS-1/E3 Transceiver

Asahi Kasei Microdevices 

ASAHI KASEI

[AK2504A]

Loss of Signal

E3

AK2504A detects the loss of signal by analog and digital methods. Loss of Signal function in E3 mode is as

follows.

- Analog loss detector monitors the peak level of the incoming signal.

- If the peak level falls below Set Alarm Threshold Level as shown in Table 15, DLOS circuit starts counting

the number of the incoming data bits as described in the following section “DLOS”.

- If DLOS circuit detects consecutive 128±5 bits of the incoming data lower than Set Alarm Threshold Level,

AK2504A alarms Loss of Signal by setting RLOS high. Other output pins status is as shown in the diagram

below.

- RLOS is set low if 32±5 bits of the incoming data higher than Clear Alarm Threshold Level are detected.

Normal Operation

RCLK : Recovered from RIN input

RPDATA : Recovered data

RNDATA : Recovered data

RLOS : Low

Peak level of Set Alarm

the incoming < Threshold

data

Level

for 128 +/- 5 consecutive bits

of the incoming data

Peak level of Set Alarm

the incoming > Threshold

data

Level

for 32 +/- 5 bits

of the incoming data

LOS

RCLK : Recovered from EXCLK

RPDATA : Low

RNDATA : Low

RLOS : High

Fig. 10 Loss of Signal state diagram (E3)

MS0143-E-01

- 21 -

2004/01

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