TOSHIBA (RDTU1A) V.3 24 Port T1 Interface Circuit RDTU
What this includes:
Provides 24 channels for T1 Service on CTX670, CTX100 or DK424i, and 12-channels on DK40i. Network connection requires an external CSU. Does not provide hook switch/flash capabilities to DID/ground start circuits. If these services are needed, you must upgrade to RDTU2A.