IPSEC VPN Bandwidth question with different ISP speeds on both locations

There is a site to site IPsec vpn. Site A is 18down/3up Cable broadband, Site B is 18down/18up dedicated line. Not taking in consideration overhead or inconsistency of the broadband ISP.
It is my understanding that the VPN tunnel bandwidth would be 3up/3down. However, my colleagues which are much more experienced than I am, informed me that it would be 18down and 3 up. Can someone please clarify this for me and provide me a location where I can read about this.
ctechsolAsked:
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Fred MarshallPrincipalCommented:
Site A              3 up               18 down          
Site B            18 down         18 up
Combined      3                     18

A to B 3Mbps
B to A 18Mbps

VPN at Site A: 18 down because A is 18 down and B is 18 up at the other end.
VPN at Site A: 3 up because A is 3 up
VPN at Site B: 3 down because it's limited by Site A uplink speed at the other end.
VPN at Site B: 18 up because both Site B and Site A (down) will support that.

So the tunnel speed will be 18 Mbps moving data from B to A and 3 Mbps moving data from A to B.

Data rate is limited by the slowest link in the chain.
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ctechsolAuthor Commented:
Thank you so much, I was wondering, if possible is there any known education resources about this in particular to understand how the protocol (IPSEC) sets up windowing.
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