Network data transfer rate & aggregate data transfer rate

Dear TSMers,

As I understand (pls correct me if i'm wrong), network data transer rate =
total no. of bytes transferred / data transfer time &
Aggregate data transfer rate = total no. of bytes transferred / elapsed
processing time,
where elapsed processing time include data transfer time and other misc
processing time.

So the Network data transfer rate should be greater than aggregate data
transfer rate. However, I got a customer which has the aggregate data
transfer rate greater than network data transfer rate. Does anyone have any
idea?
I just want to check if there's something wrong and where's the bottleneck
for the performance.

The environment is like this (LAN-free backup of files):
TSM server (AIX 5L) ver 4.2.1.11
Storage Agent ver 4.2.1.11
TSM Client (AIX 5L) ver 4.2.1.15

05/28/02   23:42:40 ANS1898I ***** Processed     1,500 files *****
05/28/02   23:42:40 --- SCHEDULEREC STATUS BEGIN
05/28/02   23:42:40 Total number of objects inspected:    1,890
05/28/02   23:42:40 Total number of objects backed up:    1,890
05/28/02   23:42:40 Total number of objects updated:          0
05/28/02   23:42:40 Total number of objects rebound:          0
05/28/02   23:42:40 Total number of objects deleted:          0
05/28/02   23:42:40 Total number of objects expired:          0
05/28/02   23:42:40 Total number of objects failed:           0
05/28/02   23:42:40 Total number of bytes transferred:    33.29 GB
05/28/02   23:42:40 Data transfer time:                16,002.26 sec
05/28/02   23:42:40 Network data transfer rate:        2,181.87 KB/sec
05/28/02   23:42:40 Aggregate data transfer rate:      5,695.58 KB/sec
05/28/02   23:42:40 Objects compressed by:                    0%
05/28/02   23:42:40 Elapsed processing time:           01:42:10
05/28/02   23:42:40 --- SCHEDULEREC STATUS END
05/28/02   23:42:40 --- SCHEDULEREC OBJECT END NOTES13BK 05/28/02
22:00:00


Many thanks.

Best Regards,

Molly