--- Convert-BER-XS/XS.pm 2019/04/19 20:43:24 1.10 +++ Convert-BER-XS/XS.pm 2019/04/19 20:44:34 1.11 @@ -127,7 +127,7 @@ # but all of the following are fine: $ber->[BER_DATA] = "string"; $ber->[BER_DATA] = [ASN_UNIVERSAL, ASN_INTEGER32, 0, 123]; - @$ber = (ASN_APPLICATION, SNMP_TIMETICKS, 1000); + @$ber = (ASN_APPLICATION, SNMP_TIMETICKS, 0, 1000); I is something like a namespace for Is - there is the C namespace which defines tags common to all ASN.1