(50 ILCS 750/2.26)
Sec. 2.26. Trunk line. "Trunk line" means a transmission path, or group of transmission paths, connecting a subscriber's Private Branch Exchange ("P.B.X.") to a telecommunications carrier's public switched network. In the case of regular service, each voice grade communications channel or equivalent amount of bandwidth capable of transporting either the subscriber's inter-premises voice telecommunications services to the public switched network or the subscriber's 9-1-1 calls to the public agency shall be considered a trunk line, even if it is bundled with other channels or additional bandwidth. In the case of advanced service, each DS-1, T-1, or similar un-channelized or multi-channel transmission facility that is capable of transporting either the subscriber's inter-premises voice telecommunications services to the public switched network or the subscriber's 9-1-1 calls to the public agency shall be considered a single trunk line, even if it contains multiple voice grade communications channels or otherwise supports 2 or more voice grade calls ("VGC") at a time; provided, however, that each additional 1.544 Mbps of transmission capacity that is capable of transporting either the subscriber's inter-premises voice telecommunications services to the public switched network or the subscriber's 9-1-1 calls to the public agency shall be considered an additional trunk line.
(Source: P.A. 97-463, eff. 8-19-11.)
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Last modified: February 18, 2015