UMTS: Utran lub interface NBAP signaling message question

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I got a question when I was reading the protocol  3GPP TS 25.433
Unlike CDMA abis messages, those messages and IEs defined in the
protocol don't give out the exact message length.
For example:

IE {Message Discriminator}  has an IE type of { Enumerated (common,
dedicated) }
What does this mean ? does it have 8 bits or 16 bits in length ?

IE{Chip Offset } has an IE type of { INTEGER(0..38399) }
How long is this number ? 24 bits or 32 bits?

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