RFC-1128 "Measured Performance of the Network Time Protocol in the Internet System" is available only in PostScript form in the file RFC1128.PS This file is too large to be sent through the mail system. If you are unable to obtain this file through FTP (as RFC:RFC1128.PS), please contact the NIC hotline at (800) 235-3155 to find out how to order a hardcopy of it through the US Mail.