# Multiple subscription to a single output message output port

**URL:** <https://www.ruby-forum.com/t/multiple-subscription-to-a-single-output-message-output-port/241279>\
**Category:** GNU Radio\
**Created:** [May 21, 2014, 4:09pm UTC](https://www.ruby-forum.com/t/multiple-subscription-to-a-single-output-message-output-port/241279 "2014-05-21T16:09:40Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![musicdenotation](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ea666f/32.png) [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\
**Post date:** [May 21, 2014, 4:09pm UTC](https://www.ruby-forum.com/t/multiple-subscription-to-a-single-output-message-output-port/241279/1 "2014-05-21T16:09:40Z")

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Hi all guys,

I currently have a hier block, and a several sub blocks are sending  
messages to a block outside of hier block. Is it possible that all  
subblocks subscribe to a unique output message port? At the moment I  
have  
to change a lot of code when i am about to add a new block which sends  
message.

Best,