Case Communications Mayze 24, Reference Manual, Page: 156 / 166

C.4 The Telephone Socket on the Modem
For your safety a blanking plug has been fitted to the telephone socket of
your modem to prevent access to internal connections, which may carry
hazardous voltages generated by the telephone network.
Instructions for connecting a telephone to this socket are given in the
Appendix entitled 'Technical Guide'. If the telephone connection is
removed, you must re-fit the blanking plug.
If you find that you have lost the blanking plug, you can obtain a
replacement from your supplier. Please quote part number A225-600094.
X460-306851 Issue 1 C-8 Rev.0