I am see a big difference in throughput when connecting a PC through the PC port on a Cisco 7942 phone, compared to when the PC is directly connected to a switch. My setup is a 2960G POE switch, CM 8.6 and 7962 phones.
For example if my PC is connected directly into the switch, I can transfer a file in Windows at about 50~60 MB/s
But if I connect to the pass through port on the phone, my transfer speeds slows down to about 5~10 MB/s
Now even though the phone is only at 10/100 speed, my throughput should be a lot better. Could this be a configuration issue with QOS? if so, QOS is configured on the switch so wouldn't that affect the PC if the PC is connected directly to the switch?
I have 2 other locations with CMs that are not seeing this issue.
Just want to make sure I understand. You said its a 2960G switch right? That would be a gig switch. Then you are plugging a 7942 phone in, and then plugging a pc in to the phone. Is that all correct? Cause the phone will only give you 100mg out, thus cutting you down to a 1/10th the speed of being plugged directly in to the switch.
10/100 ethernet speed is in Megabits per second (Mbps), and it sounds like your transfer speeds are in MegaBytes per second (MB/s). Little b=bits, Big B=Bytes, 1 B = 8 b. 100 Megabits is equal to 12.5 Megabytes. A good portion of that will be lost to overhead. 5 -10 Megabytes per second is about what I would expect from a 10/100 ethernet connection, and the 50-60 MB/s you mention is indicative of a 10/100/1000 ethernet connection. I'm not seeing anything unusual here.