Connection Brokers parameter in 12c

The reference manual for the CONNECTION_BROKERS parameter says the following:

CONNECTION_BROKERS

Property	Description
Parameter type	String
Syntax	CONNECTION_BROKERS = broker_description[,...]
	broker_description::= ((type_clause)(brokers_clause)[(broker_options)])
	type_clause::= TYPE={ DEDICATED | POOLED } Indicates the broker type. This is a mandatory parameter.
	brokers_clause::= BROKERS=<span class="codeinlineitalic">integer</span> Indicates the number of brokers of the specified type. This is a mandatory parameter. The specified integer value must be greater than or equal to 0. If set to 0, brokers will not accept new connections, but existing connections will continue as normal.
	broker_options::= CONNECTIONS=<span class="codeinlineitalic">integer</span>