Multilink PPP NxT1 vs Fractional DS3

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Sep 11th, 2008
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I am trying to determine which technology to go with so I am trying to determine if there is any significant overhead associated with MLPPP or any other benefits to a Fractional DS3 circuit.

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shillyar Thu, 09/11/2008 - 16:06
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I dont think the overhead is really an issue. I would say proably the higher the cost of a fraction ds3 would be the bigger issue.

Thx Steve

rkeough Thu, 09/11/2008 - 16:23
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Steve, Thanks for the reply. I guess I am wondering just how much overhead there might be. There is a breakeven in cost between NxT1 and DS3 I guess I am trying to factor in any overhead that would also be factored in.

lprestipino Mon, 09/15/2008 - 08:59
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I have a troubleshooting question I have a Single T1 in a Bundle that will not go active the interface ser0/1/1:0 is Up down

I can not seem to get the Telco to believe it is his fault. I need a good document on troubleshooting and debugging the PPP Multilink. this is what it does shen I do a no shut on the interface


.Sep 15 16:23:26: Se0/1/1:0 PPP: Using default call direction

.Sep 15 16:23:26: Se0/1/1:0 PPP: Treating connection as a dedicated line

.Sep 15 16:23:26: Se0/1/1:0 PPP: Session handle[B3000069] Session id[121]

.Sep 15 16:23:26: Se0/1/1:0 PPP: Phase is ESTABLISHING, Active Open

.Sep 15 16:23:26: Se0/1/1:0 LCP: O CONFREQ [Closed] id 122 len 33

.Sep 15 16:23:26: Se0/1/1:0 LCP: MagicNumber 0x4CE33619 (0x05064CE33619)

.Sep 15 16:23:26: Se0/1/1:0 LCP: MRRU 1500 (0x110405DC)

.Sep 15 16:23:26: Se0/1/1:0 LCP: EndpointDisc 1 p1551291-1684241

.Sep 15 16:23:26: Se0/1/1:0 LCP: (0x13130170313535313239312D31363834)

.Sep 15 16:23:26: Se0/1/1:0 LCP: (0x323431)


.Sep 15 16:23:28: Se0/1/1:0 LCP: Timeout: State REQsent

.Sep 15 16:23:28: Se0/1/1:0 LCP: O CONFREQ [REQsent] id 123 len 33

.Sep 15 16:23:28: Se0/1/1:0 LCP: MagicNumber 0x4CE33619 (0x05064CE33619)

.Sep 15 16:23:28: Se0/1/1:0 LCP: MRRU 1500 (0x110405DC)

.Sep 15 16:23:28: Se0/1/1:0 LCP: EndpointDisc 1 p1551291-1684241

.Sep 15 16:23:28: Se0/1/1:0 LCP: (0x13130170313535313239312D31363834)

.Sep 15 16:23:28: Se0/1/1:0 LCP: (0x323431)

The EndpointDisc matches the configured PAP I am telling telco they are not sending.

shillyar Fri, 09/12/2008 - 10:15
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I found this for a DS3

Line rate: 44,736,000 b/s

Signals: 7 DS2 signals = 28 DS1 signals

Overhead bits:

56 bits total/frame

F-bits (framing) 28 bits/

M-bits (multiframing) 3 bits/

C-bits (stuffing) 21 bits

X-bits (message) 2 bits/

P-bits (parity) 2 bits/

Data bits between overhead bits 84

so the over head appears to be very low. So the over head on the MLPP would vary a bit depending on how many and what your multilinking together.

Again the cost would proably be the big deciding factor is there is a big difference in price but, the speeds/through puts would be very similiar if your comparing apples to apples.



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