JasonH
Guest
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 Posted:
Tue Sep 14, 2004 8:47 pm Post subject:
DSL DTM Carrier Bin and DSL Pilot Tone Question |
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I have a number of Cisco 837 DSL routers (ATM over DSL, ITU G.992.1 or
G.DMT), running the command:
show dsl int atm0
I see the number of used DTM bits on carrier bin 66 (280KHz) as low on
some routers and high on others. I know this to be the DSL Pilot
Tone, what I can't figure out is, it evidence of anything wrong if
your router has trained to use this carrier bin? Do all DSL circuits
have a pilot tone?
Router A(see hex 41, dec 65):
DMT Bits Per Bin
00: 0 0 0 0 0 0 0 7 7 7 9 A B B A B
10: B B A B B B B A A A A 9 8 8 0 0
20: 0 0 0 0 0 0 2 2 2 4 5 6 6 6 7 7
30: 8 8 8 9 9 9 9 9 9 A A A 6 A B A
40: B A A 7 8 A A A 6 B 2 9 B B B C
^this one = A
Router B:
DMT Bits Per Bin
00: 0 0 0 0 0 0 0 6 6 7 9 A B B C C
10: C B B B B B B B A 9 8 8 8 8 0 0
20: 0 0 0 0 0 0 0 0 0 0 0 2 2 2 3 4
30: 4 4 5 5 5 6 6 6 6 6 7 7 7 7 7 7
40: 7 2 7 7 7 7 7 7 7 7 7 7 7 7 6 7
^this one = 2 |
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Merlin
Guest
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| Posted:
Tue Oct 05, 2004 2:10 am Post subject:
Re: DSL DTM Carrier Bin and DSL Pilot Tone Question |
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"JasonH" <jason.hammerschmidt@gmail.com> wrote in message
news:ed44423c.0409140847.25392905@posting.google.com...
| Quote: | I have a number of Cisco 837 DSL routers (ATM over DSL, ITU G.992.1 or
G.DMT), running the command:
show dsl int atm0
I see the number of used DTM bits on carrier bin 66 (280KHz) as low on
some routers and high on others. I know this to be the DSL Pilot
Tone, what I can't figure out is, it evidence of anything wrong if
your router has trained to use this carrier bin? Do all DSL circuits
have a pilot tone?
Router A(see hex 41, dec 65):
DMT Bits Per Bin
00: 0 0 0 0 0 0 0 7 7 7 9 A B B A B
10: B B A B B B B A A A A 9 8 8 0 0
20: 0 0 0 0 0 0 2 2 2 4 5 6 6 6 7 7
30: 8 8 8 9 9 9 9 9 9 A A A 6 A B A
40: B A A 7 8 A A A 6 B 2 9 B B B C
^this one = A
Router B:
DMT Bits Per Bin
00: 0 0 0 0 0 0 0 6 6 7 9 A B B C C
10: C B B B B B B B A 9 8 8 8 8 0 0
20: 0 0 0 0 0 0 0 0 0 0 0 2 2 2 3 4
30: 4 4 5 5 5 6 6 6 6 6 7 7 7 7 7 7
40: 7 2 7 7 7 7 7 7 7 7 7 7 7 7 6 7
^this one = 2
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Yes,
All modems have a pilot tone, depending upon which training mode is used.
i.e G.DMT or T1.413
--
Merlin |
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