ISDN Lines cisco Router

Hi, i am new to this, i just want to know how many ISDN lines we can have through cisco router 2921? if we get ISDN 2+ whats the difference, would that mean we can have more lines, also do we have to purchase additional hardware on top of router 2921 for ISDN.
We need 6 ISDN lines.....
thanks
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LeoAsked:
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Don JohnstonConnect With a Mentor InstructorCommented:
i just want to know how many ISDN lines we can have through cisco router 2921?

Depends on how many available slots you have. The 2921 has 4 slots so you could install a HWIC-1B-U in each slot and get 4 physical ISDN lines.

Or if you use the 4-port BRI card in each slot, you could have 16 ISDN lines.
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LeoAuthor Commented:
At the moment there are 3 PSTN services connected to a non industry standard router (home router) , so would it be possible that we can connect a new interface card? and get 3 more lines?
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LeoAuthor Commented:
just to clarify you said 2921 has 4 slots already?

or it can have 4 ISDN lines once we will install HWIC-1B-U?
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Don JohnstonConnect With a Mentor InstructorCommented:
According to the data sheet, the 2921 has 4 slots. I don't know if you're using any so how many are actually available is an unknown.

The HWIC-1B-U has one ISDN connection. So if you can install 4 of them, you will have 4 ISDN ports.
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LeoAuthor Commented:
the slots are not being used, it needs to be configured....

as you said it has 4 slots, so correct me if i am wrong i have to buy 4 HWIC-1B-U, to get 4 ISDN lines, if i need more then that then i have to buy  4-port BRI and i have to install it in each slot to get more ISDN lines?
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Don JohnstonInstructorCommented:
If you want 4 ISDN lines, you could purchase 4 of the 1-port cards (one in each slot) or purchase a single 4-port card.
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LeoAuthor Commented:
once we purchase single 4 port card, would it be like opening up the router and there would be a place where we can slide them in?
any idea how much they cost.?
thanks
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Don JohnstonInstructorCommented:
The slots are externally accessible. Cost is dependent on where you buy them. Ebay would most likely be less than a Cisco reseller.
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LeoAuthor Commented:
Thanks for that, if we need PSTN lines, on this router whats we can do?
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Don JohnstonInstructorCommented:
PSTN? You mean like analog dial-up?

I can't imagine that Cisco is still selling analog modem cards for these platforms. I'm guessing that you would have to get a serial card for one of the slots and connect it to an external modem.
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LeoAuthor Commented:
i didnt really get all of what they are saying in this forum, but is it related to this question...

http://www.gossamer-threads.com/lists/cisco/voip/122932
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Don JohnstonInstructorCommented:
How many analog lines do you have coming in?
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LeoAuthor Commented:
3 lines...we need 6 atleast...
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Don JohnstonInstructorCommented:
Then I guess you could use that card. Seems like overkill though.
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LeoAuthor Commented:
so if we use that card, how may we have to buy?
and why it would be overkill?
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LeoAuthor Commented:
I mean to say how many we should buy ? and is it more like we can slide it in to one of the slots?
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Don JohnstonInstructorCommented:
That card supports 24 lines
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LeoAuthor Commented:
so 1 card will support 24 lines?
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Don JohnstonInstructorCommented:
Yes
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LeoAuthor Commented:
can you please have a look at this question as well...

http://www.experts-exchange.com/Networking/Protocols/Q_27651489.html 

i will award points for this question once we finalize the orders.....
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LeoAuthor Commented:
I was looking at the interface card for PSTN, how would you plug an analog cable in that? from the picture it looks like a serial connection.....
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Don JohnstonInstructorCommented:
I has (what I've always called) a harmonica connector. That connects to either an octopus cable with either a bunch of modular connectors on the other end or a connector to a PBX.

But analog isn't my forte. I'm a digital guy.
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Don JohnstonInstructorCommented:
No.
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LeoAuthor Commented:
then what harmonica connector is plugged into?
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Don JohnstonInstructorCommented:
Why do you want a card that supports 24 lines when all you have is 6 lines?
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