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Sync vs Data Rate

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Hi community / OCE's 

This is more curiosity than concern but could someone explain why my download data rate says I can achieve 84 Mbps but my sync only achieves 70.137 Mbps (In reality 67 Mbps)

 

But I'm able to achieve the full 20.00 Mbps upload? 

 

With a maximum data rate of 84 Mbps I should in theory be able to achieve the full 79999. 

 

On BT infinity I did achieve 79999/20000.

 

If anyone can shed some light on this then I would appreciate it.

 

Other than that everything else is great.

 

Thanks!

 

Broadband Information:

 

Up
Connection status:
Showtime
Upstream line rate (kbit/s):
20000
Downstream line rate (kbit/s):
70317
Maximum upstream rate (kbit/s):
22279
Maximum downstream rate (kbit/s):
84432
Upstream noise safety coefficient (dB):
6.7
Downstream noise safety coefficient (dB):
6.8
Upstream interleave depth:
1
Downstream interleave depth:
1
Line standard:
VDSL2
Upstream line attenuation (dB):
0.1
Downstream line attenuation (dB):
6.8
Upstream output power (dBm):
2.3
Downstream output power (dBm):
13.1
Channel type:
Fast
DSL up-time:
2 days 3 hours 41 minutes 6 seconds
 
ADSL Checker Results:
 
Range A (Clean)
Downstream 
High  Low
80      70.7
 
Upstream
High   Low
20       20
 
Range B (Impacted)
Downstream
High  Low
80       51
 
Upstream
High   Low
20     17.4
 
I couldn't upload a screenshot so I manually typed in the important bits. 
 
 

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