[VoIP] T1 channel bank for sale

[Steph Kerman]

"T1" identifies a broad class of PCM channel banks operating at 1.544 Mb/S. I believe a "real" T1 channel bank (D1/D1D) had 24 individual channel cards.  Prior to the last 10-15 years explosion in cheap consumer grade channel banks intended to go on the customer premises, utility grade D4 channel banks provided 48 channels using an individual channel card per channel.  Most probably operated in Mode 3, requiring two T1 span lines to serve the 48 channels.

Steph

-----Original Message-----
>From: Jonathan Kay <g4vft at btinternet.com>
>Sent: Apr 30, 2008 4:40 AM
>To: Voice Over IP Tandem for Analog Switches <voip at ckts.info>
>Subject: Re: [VoIP] T1 channel bank for sale
>
>Mark,
>There are up to 6 cards with 4 channels a piece. So I guess this one has 
>3 cards fitted.
>
>Jon
>
>Mad Mark wrote:
>> I always thought T1 carried 24 voice channels. Or, is it 24 single-direction voice channels (one for transmit, one for receive, 24 channels = 12 circuits)?
>>
>> Arthur Bloom wrote:
>>   
>>> T1 Channel Bank for sale. Has 12 FXS ports. Works well. $60 includes shipping to 48 states.
>>>     
>>
>>
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