For example: Agilent E4440A or Anritsu 68369
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Scientific Atlanta 4653A Overview
The 4653A Error Rate Test Transmitter provides a selection of standard DS1, DS1C, and DS2 test data patterns. Available output patterns include PRBS, minimum density, all ones, alternate ones and zeros, or a user-programmable pattern. Framing can be inserted or inhibited by a front panel switch. Single bit or bipolar violation errors can be inserted in the data stream, or an adjustable error rate can be selected.