Word is, the TA-1500 series is or soon will be MFG Discontinued. If this is true, we are going to be in big trouble in the future trying to replace defective parts at thousands of sites. What is replacing the MD'ed TA-1500 platform / channel bank?
The TA1500 channel bank was discontinued in January 2015 due to obsolete components on multiple cards. There is no direct replacement for it. For POTS service the TA850 can be used. It is a single T1 solution.