[asterisk-users] when to use e1/t1 card?

[Steve Edwards]

On Tue, 22 Jun 2010, Zeeshan Zakaria wrote:

> If you are doing pure VoIP and no PRIs or PSTN, you don't need these 
> cards.

Just to clarify the acronyms...

PRI is Primary Rate Integrated Services Digital Network (usually 
delivering 24 (T1) or 31 (E1) channels over a 4 wire connection with 
connectors that look like RJ45 but are really RJ48).

POTS is Plain Old Telephone Service (usually delivering a single circuit 
over a 2 wire connection with connectors commonly known as RJ11). POTS 
circuits can be combined (or split up) into a T1 (or E1) using a device 
known as a channel bank.

PSTN is the Public Switched Telephone Network.

So, wouldn't it be more accurate to say "no PRIs or POTS" since both are 
used to connect to the PSTN?

-- 
Thanks in advance,
-------------------------------------------------------------------------
Steve Edwards       sedwards at sedwards.com      Voice: +1-760-468-3867 PST
Newline                                              Fax: +1-760-731-3000