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28 Universal Network Terminal TAU-72.IP/TAU-36.IP
Execute actions that listed above in reverse order to assemble the device into case.
Fig. 8 - TAU-72.IP/TAU-36.IP assembling screw types
Fig. above shows screw types, used for assembling the device into case:
1. Rack brackets mounting.
2. Case parts mounting.
3. Board, ventilation unit, plug, rail mountings.
4. Fan mounting screw.
5. Earthing screw.
To protect subscriber lines against surge, linear side of the cross must be equipped with ‘MKZ
3-K’ arresters with operate voltage of 230V.
The arresters (MKZ) are designed to protect the FXS and FXO sets of TAU-72M.IP and TAU-
36M.IP gateways from dangerous surge voltages and currents in air cable strands caused by
lightning discharge, high-voltage electric transmission lines, overhead wirings of electric railway and
various industrial sources of impulse interferences as well as from contact with low voltage power
lines.
The arresters contain two voltage protection cascades (the first one is on the aerial fuse, the
second one is on the semiconductor switches) and current protection (on the polymer posistors).
The installation of MKZ arrestors requires the grounding bar mounted on the linear side. The
arrester is installed in normally closed connecting strip (Krone, Intercross or their compatibles)
according to the marking on the device body. The connection diagram is shown in Fig. 9.
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