TXC-04251 mapper equivalent, qt1m device quad t1 mapper.
* Add/drop four 1.544 Mbit/s signals from an STS-1, an STS-3/AU-3, or an STM-1 VC-4
* Independent add and drop bus timing modes
* Selectable AMI or B8ZS posit.
Four T1 1.544 Mbit/s signals are mapped to and from asynchronous 1.5 Virtual Tributaries (VT1.5s) or Tributary Unit-11s.
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