Avaya TN2224 2-Wire Digital 24 Port Circuit Pack, part #TN2224
The TN2224 provides twenty-four DCP ports that can connect to two-wire terminals such as the 2400, 6400, 8400, or 9400 series digital voice terminals and the 302C attendant console.
The upgraded TN2224B 2-Wire Digital 24 Port Circuit Pack , part number 700059652, is also available.