DS21FT40 framer equivalent, four x three 12 channel e1 framer.
* Twelve (12) completely independent E1 Framers in one small 27 mm x 27 mm Package
* Each Multi-Chip Module (MCM) Contains Three DS21Q44 Quad E1 Framer Die
* .
* Integral HDLC controller with 64-byte buffers. Configurable for Sa bits or DS0 operation
* Detects and generat.
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