TXC-04218 mapper equivalent, 8-channel dual bus mapper.
* Add/drop up to 8 E1, DS1, or VT/TU payloads from two add and two drop STM-1/VC4, STS-3 buses
* Add bus and drop bus timing modes
* Cross mapping application.
(DS1 mapped to/from VT2/TU-12s)
* Selectable HDB3/B8ZS/AMI positive/negative rail, NRZ, or VT/TU interfaces per chan.
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