Calculate Bandwidth Utilization for E1 Using SNMP

Hi.
I need to calculate Bandwidth utilization for E1interface via SNMP.
I tried to use information from this article http://www.cisco.com/en/US/tech/tk648/tk362/technologies_tech_note09186a008009496e.shtml
Last night I've got the following data from my Cisco 3845:
Timestamp
ifDescr
ifType
ifSpeed
ifInOctets
ifOutOctets
DifInOctets
DifOutOctets
InBandwidth
OutBandwidth
11/16/10 09:17:54
Serial0/1/0:0
propPointToPointSerial
2000000
843263887
1375140745
160094
35355
64
14
11/16/10 09:18:54
Serial0/1/0:0
propPointToPointSerial
2000000
859483004
1377623371
270318
41377
108
17
11/16/10 09:19:54
Serial0/1/0:0
propPointToPointSerial
2000000
873254258
1380108133
229520
41412
92
17
DifInOctets = delta(ifInOctets)/delta(time)
As you can see I've got InBandwidth>100%
Why it so?
If I change ifSpeed from 2000000 to 2048*1024 bits per second (right value for E1 interface) it doesn't give me InBandwidth<100%
In attachment you can find a part of gateway config

You may keep on cracking your head against equations, it's up to you. If I were you I would have already installed Oracle 10g Grid Control and I would already have configured a 6 month retention period for the performance statistics and setup a report of resource consumption.
~ Madrid
http://hrivera99.blogspot.com

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