Voice T1 lines can transmit 1.544
megabits per second, or can be used to transmit 24 digitized voice channels.
Hence it can be used for phone service up to 60 times faster than a traditional
modem. In that way, a business with 8 phone lines may save money by getting a
dedicated voice T1 line to loop to the place of business from the local phone
company office.
Voice T1 connections have 24
channels in total. Typically, for voice T1 protocols, 23 channels are used as
B-Channels and 1 channel is used as a D-channel. For this reason, the frame
structure of a voice T1 connection is said to be 23B+1D where the D-channel is
located ion timeslot 23. The B-channels are used for voice transmit and the
D-channel is for signaling. The common denominator between voice T1 and ISDN
PRI is the circuit that is provided at the demarcation point is based on the
electrical specifications for the T1 trunk lines and are originally developed
for the Bell System. It runs at 1.544 Mbps with copper wire for transmit and
receive.
If your office is equipped with
voice T1, it means that the phone company has brought a fiber optic line into
your office. A voice T1 line can carry about 192,000 bytes per second that
would be roughly 60 times more data than a normal residential modem. It is also
extremely reliable: a voice T1 can generally handle quite a number of people. For
general browsing, hundreds of users are easily. ISDN PRI, on the other hand,
offers two speeds of service: BRI or basic rate interface and PRI or Primary
rate interface. BRI is a low capacity service intended for residential and
small business applications. PRI is the high capacity service carried on T1
trunk lines between the main offices to your location.
Voice T1 can be expensive, but
prices are dropping as demand grows. Internet service providers need not to
sacrifice money since voice T1 is sure to provide more advanced standards on
communications.
Digital South Communications
503 E Jackson St., #121, Tampa, FL
33602
727-441-2700
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