T1 PRI For PBX Telephony
A T1 PRI, also called an ISDN PRI, is a "Primary Rate Interface" providing 23 individual digitized telephone lines plus data such as Caller ID on a single digital telephone trunk line. A PRI line is usually much less expensive than a dozen or more analog business phone lines.

Bonding T1 Lines for Higher Bandwidth
While a standard T1 line provides 1.5 Mbps upload and download bandwidth, lines can be bonded to create total bandwidths of 3 Mbps, 4.5 Mbps, 6 Mbps, 7.5 Mbps, 9 Mbps, 10.5 Mbps and 12 Mbps. An advantage T1 lines have over fiber optic connections is that they are available nearly everywhere without special construction.

Channelized T1 vs ISDN PRI
T1 lines can support two protocols of switched circuit telephony. Channelized T1 lines offer 24 phone lines using in-band signaling. ISDN PRI, or Primary Rate Interface, offers 23 phone lines and common channel signaling that can include data such as ANI Automatic Number Identification or Caller ID.

T1 and T3 Lines for Wireless Backhaul
A WISP or Wireless Internet Service Provider needs a way to connect the Internet to the tower radios. T1 lines and bonded T1 lines are widely used for this purpose, as well as cellular tower backhaul, because of their almost universal availability. T3 lines offer 28x the bandwidth of T1 lines but are typically more available in larger metropolitan areas.

T1 Line Bandwidth Explained
A T1 line is typically referred to as having a bandwidth of 1.5 Mbps. The precise line speed is 1.544 Mbps. However, the usable bandwidth or payload is actually 1.536 Mbps. The difference is 8 Kbps which is used for line framing to keep the transmitting and receiving ends of the circuit in synchronization.

T1 Prices Now at New Lows!
If you need T1 through T3, PRI, or Ethernet wireline service for WAN networking or PBX telephony, this form will find you the best current prices from a suite of competitive service providers. Get instant online quotes right now..

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