black box IC221A-R3 
型号:IC221A-R3 
产品描述:RS-232 to V.35 Interface Converter, Standalone
Further Details : Bidirectional operation at speeds up to 64 kbps 
(sync only).
Support 11 active RS-232 leads and 14 active V.35 leads.
Feature DB25 male (RS-232) and M/34 female (V.35) connectors.
Standalone and card version .
LEDs tell you at a glance when there’s activity on your line.
Black Box  you the expense of costly V.35 upgrades.