Hi Brandon,
Can you have a look at this
http://www.cisco.com/en/US/docs/voice_ip_comm/jabber/Windows/9_1/JABW_BK_CA48EE46_00_cisco-jabber-for-windows-administration_chapter_01.html#JABW_RF_Q07E13E6_00
You get an idea of the bit rate for different resolutions in a lab environment.
Also from the same guide
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Video Rate Adaptation
Cisco Jabber for Windows uses video rate adaptation to negotiate optimum video quality. Video rate adaptation dynamically increases or decreases video bit rate throughput to handle real-time variations on available IP path bandwidth.
Cisco Jabber for Windows users should expect video calls to begin at lower resolution and scale upwards to higher resolution over a short period of time. Cisco Jabber for Windows saves history so that subsequent video calls should begin at the optimal resolution.
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HTH,
Christos