Solved: vwic with t1 (voice), wic with t1(data)

sarahr202 · ‎11-12-2012

Hi everybody.

I found there are some wic card for voice, called vwic. Some of these cards can support t1 connection.

My question what is the difference between a wic card with T1 for data and vwic with T1 for voice?

I understand vwic with t1 uses slots to support voice calls but a wic with t1 for data also uses such slots or not?

thanks and have a great day

Reza Sharifi · ‎11-12-2012

Hi Sarah,

I understand vwic with t1 uses slots to support voice calls but a wic with t1 for data also uses such slots or not?

No, the data T1 does not have slot, but it can be sub-rated.

So, a full T1 is 1.5Mbps, but can be sub-rated for example to 3 512Kb using frame relay. In the old days (up to 5 to 7 years ago) T1s were very popular in the US and a lots of companies and businesses use them to connect their sites together. These days, most businesses have high speed Internet and use MPLS VPN to connect the sites together. So, since bandwidth is very cheap and T1s are very low speed and expensive, they are not being used much here anymore. A lots of ISPs provide metro Ethernet and can hand off 10, 20, 50, 100 or even Gig of Ethernet for access to Internet.

A voice T1 is usually called PRI, and it is used by most businesses to connect their phone systems to PSTN. It has 24 64Kbps channeles and it is used to carry voice traffic.

http://en.wikipedia.org/wiki/Primary_Rate_Interface

HTH

View solution in original post

Richard Burts · ‎11-12-2012

Reza

I think that perhaps you interpret the question about slots to be hardware slots. But I interpret the question to be about time slots. And in that context there are T1 cards (wic/vwic) used for data that can allocate a group of time slots for data to one channel group and can allocate another group of time slots to another channel group. This effectively creates multiple serial subinterfaces on one physical interface and has the capabilities of a multiplexor on the T1 card.

So I think that the correct answer is that it depends on the capabilities of the particular T1 card. Some of them do group time slots for either voice or for data.

HTH

Rick

HTH

Rick

View solution in original post

Reza Sharifi · ‎11-12-2012

Hi Sarah,

I understand vwic with t1 uses slots to support voice calls but a wic with t1 for data also uses such slots or not?

No, the data T1 does not have slot, but it can be sub-rated.

So, a full T1 is 1.5Mbps, but can be sub-rated for example to 3 512Kb using frame relay. In the old days (up to 5 to 7 years ago) T1s were very popular in the US and a lots of companies and businesses use them to connect their sites together. These days, most businesses have high speed Internet and use MPLS VPN to connect the sites together. So, since bandwidth is very cheap and T1s are very low speed and expensive, they are not being used much here anymore. A lots of ISPs provide metro Ethernet and can hand off 10, 20, 50, 100 or even Gig of Ethernet for access to Internet.

A voice T1 is usually called PRI, and it is used by most businesses to connect their phone systems to PSTN. It has 24 64Kbps channeles and it is used to carry voice traffic.

http://en.wikipedia.org/wiki/Primary_Rate_Interface

HTH

Richard Burts · ‎11-12-2012

Reza

I think that perhaps you interpret the question about slots to be hardware slots. But I interpret the question to be about time slots. And in that context there are T1 cards (wic/vwic) used for data that can allocate a group of time slots for data to one channel group and can allocate another group of time slots to another channel group. This effectively creates multiple serial subinterfaces on one physical interface and has the capabilities of a multiplexor on the T1 card.

So I think that the correct answer is that it depends on the capabilities of the particular T1 card. Some of them do group time slots for either voice or for data.

HTH

Rick

HTH

Rick

sarahr202 · ‎11-13-2012

thanks Reza and Rick.