X.21 MODULE HS (HCM2) WITH ADAPTOR Aggregate module offering X.21/RS449 compatible interface for connection to point-to-point or dial up networks with data speeds of 48/56/64kb/s and n*8K up to 128K, n*64K to 512kb/s. Module supports internal doppler buff

X.21 MODULE HS (HCM2) WITH ADAPTOR Aggregate module offering X.21/RS449 compatible interface for connection to point-to-point or dial up networks with data speeds of 48/56/64kb/s and n*8K up to 128K, n*64K to 512kb/s. Module supports internal doppler buffers for satellite and terrestrial communications. Functionally identical to 90-0583-03 but includes internal cable and adaptor plate for use with Rack Mount 3612(90-0575-68).