HP auroraTempo User Manual page 279

A device with input/output capability e.g. a PC, node or
Workstation
terminal
A standard X-series connector, specified by ISO 4903, which
X.21
can be used with aurora
a D15.
Interface for the transmission of packets over public data
X.25
networks.
A type of flow control where the special characters XON
Xon/Xoff
(11H) and XOFF (13H) are used to stop and restart the flow
of data.
Issue 1a - 10/99
Appendix 4 - Glossary
. The connector is also known as
Tempo
A4 - 13