Description
To provide isolation protection between groups of 21 E1 circuits on the Customer network and the Adtran MX2800. Optionally they can introduce 510 ohm in-line resistors at network connection to 'T' off a -20dB (0.6Vpp) sample, when the E21 Isolator Unit is within 3m (10 foot) of the Network.

Physical Description
2 U High, 25mm Deep, Powder Coated Black, 1.5mm Zintec. 4 or 8 Shielded 50 Way Amp Champ Female connectors mounted vertically to the front elevation. Each 50 way connector carries 21 circuits, isolation is provided by 21 x 1:1 line isolation transformers. The optional 510 ohm .33 watt commercial resistors, 42 in total, 'T' off a -20dB sample of the signal.