NT8D15 E&M Trunk card Page 653 of 906Circuit Card Description and InstallationEffective loss See pad table (Table 209 onpage 662)See pad table (Table 209 onpage 662)Terminating impedance 600 ohms 600 ohmsBalance impedance N/A 600 ohmsTable 203Electrical characteristics of trunk cardsCharacteristic DID Trunk CO trunkNominal impedance 600 or 900 ohms, (selectedby software)600 or 900 ohms, (selectedby software)Signaling range 2450 ohms 1700 ohmsSignaling type Loop Ground or loop startFar-end battery -42 to -52.5 V -42 to -52.5 VNear-end battery N/A -42.75 to -52.5 VMinimum loop current N/A 20 mAGround potential difference + 10 V + 3 VLow DC loop resistanceduring outpulsingN/A 300 ohmsHigh DC loop resistance N/A Ground start equal to orgreater than 30 kS. Loop startequal to or greater than 5 MSLine leakage Equal to or greater than 30kS (Tip to Ring, Tip to GND,Ring to GND).Equal to or greater than 30kS (Tip to Ring, Tip to GND,Ring to GND)Effective loss See pad table See pad tableTable 202Electrical characteristics of E&M trunk cards (Part 2 of 2)Characteristic 4-wire trunk 2-wire trunk
