This is about the Motorola R2000 series of test equipment from the earl/mid 1980's.

The 2001D was first offered in 1984/85 as the following options:

Model	Description
R-2001D	Basic Model
R-2001D/HS	Basic Model with 10MHz OCXO
R-2002D/HS	IEEE 488 (GPIB/HPIB) and 10MHz OCXO
R-2008D/HS	Cellular (AMPS) Option and 10MHz OCXO
R-2009D/HS	Cellular (AMPS) Option, IEEE 488 (GPIB/HPIB) and, 10MHz OCXO

At some later date (1986?) the other options were introduced:

Model	Description
R-2001D	Basic Model
R-2001D/HS	With high stability oscillator
R-2002D	With IEEE·488 option
R-2002D/HS	High stability oscillator and IEEE·4BB Bus option
R-2004D	With Motorola DES option
R-2004D/HS	High stability oscillator and Motorola DES option
R-2005D	With Motorola SECURENET option
R-2005D/HS	High stability oscillator and Motorola SECURENET option
R-2008D	With cellular option
R-2008D/HS	High stability oscillator and cellular option
R-2009D	With IEEE·4BB Bus and cellular options
R-2009D/HS	With high stability oscillator, IEEE-48B Bus and cellular option
R-2010D	With UK cellular option
R-2010D/HS	High stability oscillator and UK cellular option
R-2011D	With IEEE-488 Bus and UK cellular option
R-2011D/HS	High stability oscillator, IEEE·488 Bus, and UK cellular option
R-2021D	With Motorola Trunked Radio option
R-2021D/HS	High stability oscillator and Motorola Trunked Radio option
R-2045D	With Motorola DES and SECURENET options
R-2045D/HS	High stability oscillator and Motorola's DES and SECURENET options