详细资料：

Description: The Agilent HP 37721A is a  Digital Transmission Tester.

Product Specs:
Bit and code error testing at 704 kb/s, 2, 8, 34 & 140 Mb/s
Portable, lightweight, rugged
Text and graphic results on large display
Stored setups and autosetup for ease of use
Remote control, frequency offset and measurement, multiple outputs