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Chapter 1. Introduction
Fractional T1
2
performance of their service offering. Since the
introduction of ESF, equipment that is installed in
private networks can also provide the same perfor-
mance information to the user.
Fractional T1 (FT1) lets the buyer purchase less than a
full T1 circuit between two points. Most carriers offer
fractional T1 in increments of 56 or 64 kbps. Connec-
tion is made to the same network elements. The
network allows multiple users to share the same
interoffice T1 bandwidth.
Fractional T1 remains almost exclusively an Inter-
Exchange Carrier (IXC) service. Local Exchange
Carriers (LECs) typically do not offer FT1, so the
proximity of the user to the point of presence (POP) of
the IXC is key in the savings that fractional T1 offers.
Fractional T1 local access is available in two forms, 56
kbps or a full T1 line. In 56 kbps the required number
of DDS lines is extended from the IXC POP and the
bandwidth is combined at the office on an outbound
T1 circuit. The user pays for the individual 56 kbps
lines and the amount of the interoffice T1 utilized. In
T1 access, the user pays for a full T1 to the IXC POP
and then only for the bandwidth utilized.
TSU 600 User Manual
61200.076L2-1
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