Nortel NT7B74GA-93 T-1 Digital Trunk Cartridge (Refurbished)This Norstar Digital Trunk Interface (DTI) terminals a 24 channel T1 link from a public or private network. It will also support fractional T 1. An RJ48 jack provides the interface to the T1 network. Each of the 24 channels can be configured to emulate either loop start, E&M, or DID trunks. The DTI has an integrated Channel Services Unit (CSU). The CSU provides line isolation, signal regeneration, and network performance monitoring. The CSU can be