The length component of the data element indicates the length of the content component:
Short form - the length is given in one octet representing a range of numbers, because the first bit should be 0, so the value of the length is from 0 to 127
Long form - the length is given in 2 to 127 octets, the value of the length is from 128 through 21016-1. In practice, numbers are in the lower end of the range. A 1 or 0 in bit 8 of each octet has the same meaning as in the identifier field.
Indefinite form - the content of a structured data element (the only kind allowed with this form) has a specific end- of-content data element, given by two consecutive octets of all zeros. The length field contains one octet, 10000000, which signals that the end-of-content octets are present.
===Values Fields===
INTEGER: values are encoded in 2s-complement form These give a concrete representation of the value or the value of the underlying type, if the type is derived by implicit tagging.
OCTET STRINGS:
For simple string types and types derived from them by implicit tagging, the concatenation of the BER encodings of consecutive substrings of the value.
For structured types and types derived from them by implicit tagging, the concatenation of the BER encodings of components of the value