[asterisk-users] ILEC Interconnect: Basic MUX: M13 vs DCS: VT1.5 vs DS3

[Brian LaVallee]

Hi Nick,

Going from DS1 to OC-n is a multi-step process.  Typically requiring a
hardware device to handle each MUX step.  But you can find hardware that
handles multiple MUX steps together.

VT1.5 is just a raw OC-n channel containing a single DS1.
An M13 device converts between DS3 and DS1.

A DACS (DCS or DXC) provides M13 conversion, sometimes even capable of
extracting the raw VT1.5 signal directly to DS1.

The ILEC transport option you choose really depends on the terminating
interface.  Do you want to connect with a DS3 or OC-n?

No matter what hardware you choose, you will need to convert to single
copper pairs (DS1/T1) to connect to your Asterisk boxes.  So an M13 or DCS
will be necessary to reach the DS1 level.

The device you choose depends on budget and growth expectations.  Typically
a DCS is an expensive investment, handling hundreds of DS3's. An M13 device
is typically a small unit that handles one or two DS3's.

The advantage comes when you add the 29th DS1.  With VT1.5 it's just adding
a single channel, DS3 will require another whole DS3 to get an additional
DS1.


Sincerely,
Brian LaVallee



> From: Nick Khamis <symack at gmail.com>
> Reply-To: Asterisk Users Mailing List - Non-Commercial Discussion
> <asterisk-users at lists.digium.com>
> Date: Wed, 12 Jun 2013 16:19:06 -0400
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> <asterisk-users at lists.digium.com>
> Subject: [asterisk-users] ILEC Interconnect
> 
> Hello Everyone,
> 
> We are looking to interconnect with a local ILEC over an OC-n transport layer.
> They basically gave us two options in terms of mapping the SONET to the DS3:
> 
> * VT1.5s mapping
> * DS1s mapping
> 
> The second option is quite clear. We would MUX the connection, and plug
> the lines into qaud t1 cads etc... The tech mentioned that with the second
> option we would also need a DACS to convert back to M13 mapping. I was
> scared to tell him that I could not follow can someone explain that to
> me kindly :).
> 
> I don't know much about VT1.5 mapping. Can someone kindly explain what
> the benefits
> or lack of are in choosing that option. Also what type of additional
> equipment we
> would need?
> 
> In case I have overlooked something, can you gents please tell me what
> I will need in
> terms of hardware in both cases (minus routers and switches). What we
> are looking at is:
> 
> CO
> |
> |
> | OC-n
> |
> v
> DS3 MUX
> |
> |
> v
> 21 Asterisk boxes with quad T1s
> 
> 
> Kind Regards,
> 
> Nick.
> 
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