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Author Topic: two-time synchronization  (Read 431 times)

konrado5

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two-time synchronization
« on: July 19, 2018, 04:08:42 PM »

I've noticed my synchronization establishment process is two-time.
Code: [Select]
# adslctl info --show
adslctl: ADSL driver and PHY status
Status: G.994 Training
Last Retrain Reason:    8000
Last initialization procedure status:   0

# adslctl info --show
adslctl: ADSL driver and PHY status
Status: G.992 Started
Last Retrain Reason:    8000
Last initialization procedure status:   0

# adslctl info --show
adslctl: ADSL driver and PHY status
Status: G.922 Channel Analysis
Last Retrain Reason:    8000
Last initialization procedure status:   0

# adslctl info --show
adslctl: ADSL driver and PHY status
Status: G.992 Message Exchange
Last Retrain Reason:    8000
Last initialization procedure status:   0

# adslctl info --show
adslctl: ADSL driver and PHY status
Status: G.994 Training
Last Retrain Reason:    8000
Last initialization procedure status:   3

# adslctl info --show
adslctl: ADSL driver and PHY status
Status: G.992 Started
Last Retrain Reason:    8000
Last initialization procedure status:   3

# adslctl info --show
adslctl: ADSL driver and PHY status
Status: G.922 Channel Analysis
Last Retrain Reason:    8000
Last initialization procedure status:   3

# adslctl info --show
adslctl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason:    8000
Last initialization procedure status:   0
Max:    Upstream rate = 1213 Kbps, Downstream rate = 21108 Kbps
Bearer: 0, Upstream rate = 1213 Kbps, Downstream rate = 20931 Kbps

I've also type adslctl info --linediag after first synchronization.

Code: [Select]
# adslctl info --linediag
adslctl: ADSL driver and PHY status
Status: G.994 Training
Last Retrain Reason:    8000
Last initialization procedure status:   3

                Down            Up
SNRM(dB):        3.2             6.0
LATN(dB):        23.0            15.1
SATN(dB):        25.3            14.6
TxPwr(dBm):      19.1            12.0
ATTNDR(Kbps):   21272           1221
After second syncrhonzation process power output is merely 18.6 dBm.

Have somebody noticed something like this? What is cause?
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burakkucat

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Re: two-time synchronization
« Reply #1 on: July 19, 2018, 04:44:02 PM »

In the past, I have performed a similar experiment to that which you have shown and have also recorded evidence of two-attempt synchronisation process. It is a normal event for my circuit and I have never bothered to understand the reason why.

Perhaps a study of the relevant ITU-T G-Series Recommendations may reveal the answer?
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konrado5

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Re: two-time synchronization
« Reply #2 on: July 19, 2018, 10:51:19 PM »

Retrain reason is 8000 (G992 failure).
http://forum.kitz.co.uk/index.php/topic,12504.0.html
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