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How many versions of HSU cards are there?

April 26, 2017cards HSU versions

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How many versions of HSU cards are there?

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HSU (High Speed Unit) cards support two protocols, V.35 and RS530, and two interfaces, DB-25 and DB-26. We can provide all the possible combinations. 821660, 821570, 821560 has 4 DB26 connectors and supports both V.35 and RS530 (by on-board switches). 821360, 820160, has 2 DB25 connectors and supports both V.35 and RS520 (by on-board switches). 821460, 821260 has 2 DB25 connectors and supports V.35 only. 820360 has 2 DB25 connectors and only supports RS530.