[Freeswitch-users] TDM400P spans

[Fu Jiantao]

Thanks Moises!

So span is a logic concept, while channel is corresponding to the port(fxo
or fxs) on the card, am i right?

I'm new to the freeswitch and asterisk world, and found the most difficult
part is relating to the PSTN, I'm not familiar with PSTN, and I've read
asterisk book and freeswitch book, and learn the basic of PSTN, but that
seems not enough, for example, I found I can't figure out how to use
FreeTDM, little are relating to this topic, is there any good references on
this topic?

I'm trying to port the io module
chan_fx<http://www.asteriskwin32.com/chan_fx.php>in asterisk win32into
freeTDM, but I found I need to know more about the above topic.


2012/3/20 Moises Silva <moises.silva at gmail.com>

> On Sun, Mar 18, 2012 at 10:58 AM, Jeromy <fuji246 at gmail.com> wrote:
>
>> > I'm trying to convert from Asterisk to Freeswitch, and have a question
>> about
>> spans.
>> >
>> > I read the freetdm configuration example for TDM400
>> > and am wondering what exactly is a span.
>> >
>> > I have 2 TDM400P cards in my computer,
>> > one card has 2 FXS modules for connecting analog phones.
>> > The other card has 3 FXO modules for connecting to  3 PSTN trunk lines.
>> >
>> > # lsdahdi
>> > ### Span  1: WCTDM/4 "Wildcard TDM400P REV I Board 5"
>> >   1 FXS        FXOKS       (In use) (EC: OSLEC - INACTIVE)
>> >   2 FXS        FXOKS       (In use) (EC: OSLEC - INACTIVE)
>> >   3 unknown    Reserved
>> >   4 unknown    Reserved
>> > ### Span  2: WCTDM/4 "Wildcard TDM400P REV I Board 5" (MASTER)
>> >   5 FXO        FXSKS       (In use) (EC: OSLEC - INACTIVE)
>> >   6 FXO        FXSKS       (In use) (EC: OSLEC - INACTIVE)
>> >   7 FXO        FXSKS       (In use) (EC: OSLEC - INACTIVE)
>> >   8 unknown    Reserved
>> >
>> > Do I configure freetdm as in the example for TDM400
>> > with separate spans for each module like the following?
>> > or should I have just two spans as shown by lsdahsi?
>> > Thanks.
>> >
>>
>> Hi Jeremy
>>
>>    Do you find the answer to this question?
>>
>>    I'm also very confuse on the span and channel in both asterisk and
>> freeswitch, and I've found little explaination on this.
>>
>>    "   A span is a logical unit that represents a group of channels.
>>        With digital telephony, a span usually represents a physical port
>> on the card.
>>        If the system has only one such card with a single port, so it is
>> referred to
>> as span 1. "
>>
>>    Could anyone help on this?
>>
>>
> At the very least you need 2 freetdm span configurations because you
> cannot mix FXS and FXO channels in the same FreeTDM logical span.
>
> http://wiki.freeswitch.org/wiki/FreeTDM#DAHDI_mode
>
> For the given hardware output, I'd simply create 2 spans, one for all the
> fxo channels and one for all the fxs channels.
>
>  *Moises Silva
> **Manager, Software Engineering***
>
> msilva at sangoma.com
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