BSR64K 2x8 configuration question

would anyone happen to know why the maximum throughput won’t go beyond 3Mbps on my BSR64K chassis?
here is the the show chassis status and show version details. Any help would be appreciated.

bsr64k.hd.la.otra.banda:7A#show chassis status
Current Time: 04/10-18:16:31
Running archive: NVRAM:archive3_531P28H44KRBU.z

Slot Type Sub Red State RM IO UpTime LastUpTime Success Failure
0 CMTS 2x8(2.0) - RUN x x 5:52:13 1 1
1 CMTS 2x8(2.0) - RUN x x 5:52:13 1 1
2 CMTS 2x8(2.0) - RUN x x 5:52:13 1 1
3 CMTS 2x8(2.0) - RUN x x 5:52:13 1 1
4 CMTS 2x8(2.0) - RUN x x 2:38:56 3:08:17 2 2
5 - - - - 0 0
6 CMTS 2x8(2.0) - stby x - 5:52:13 1 1
7 SRM4 8 RUN x x 5:57:43 0 0
8 SRM4 - stby x - 5:51:56 1 1
9 - - - - 0 0
10 - - - - 0 0
11 DTX TX32 - RUN x p 5:54:41 1 1
12 - - - x 0 0
13 DTX TX32 - RUN x p 5:54:41 1 1
14 HSIM GE2/ETH8 - RUN x x 2:38:49 3:08:21 2 2
15 HSIM GE2/ETH8 - RUN x x 5:52:56 1 1

bsr64k.hd.la.otra.banda:7A#show version
Chassis BSR64000 HD (100Amp) Version << Redundant Ready >>
Fan Tray Version : 3 (HD)
Chassis EEPROM
Format Version: 9
Assembly Type : 21
Part Number : PCA-0079-01
HW Revision : 06
Serial Number : 037000895
Mac Address : 00:30:b8:c1:a3:00
Product Number: 033000971
Alias :
Alias SN: CHS-0009-01
Asset Id:

Slot00 CMTS 2x8 Domestic DOCSIS 2.0 CMTS, 2 Downstream x 8 Upstream Versions:
Boot ROM: RDN PPC 5.0.0.42, IXP default ixprom version
Mini ROM: CMTS2x8 Mini ROM Ver. 1.8
Image: 5.3.1P28.H44.KRBU
Date Built: Tue Jul 19 17:12:39 EDT 2011
CPU: MPC750
Memory Size: 256 MB
Format Version: 10
Assembly Type : 34
Part Number : PCA-0201-08
PDM Number : 506563-034-00
HW Revision : G
Serial Number : 050438974
Product Number: BSR 64000
Fabric Interface FPGA Version: 00001000
Mac Interface FPGA Version: 00001000
CPLD Version: 0B

Slot01 CMTS 2x8 Domestic DOCSIS 2.0 CMTS, 2 Downstream x 8 Upstream Versions:
Boot ROM: RDN PPC 5.0.0.42, IXP default ixprom version
Mini ROM: CMTS2x8 Mini ROM Ver. 1.8
Image: 5.3.1P28.H44.KRBU
Date Built: Tue Jul 19 17:12:39 EDT 2011
CPU: MPC750
Memory Size: 256 MB
Format Version: 10
Assembly Type : 34
Part Number : PCA-0201-08
PDM Number : 506563-034-00
HW Revision : G
Serial Number : 050438978
Product Number: BSR 64000
Fabric Interface FPGA Version: 00001000
Mac Interface FPGA Version: 00001000
CPLD Version: 0B

Slot02 CMTS 2x8 Domestic DOCSIS 2.0 CMTS, 2 Downstream x 8 Upstream Versions:
Boot ROM: RDN PPC 5.0.0.42, IXP default ixprom version
Mini ROM: CMTS2x8 Mini ROM Ver. 1.8
Image: 5.3.1P28.H44.KRBU
Date Built: Tue Jul 19 17:12:39 EDT 2011
CPU: MPC750
Memory Size: 256 MB
Format Version: 10
Assembly Type : 34
Part Number : PCA-0201-08
PDM Number : 506563-034-00
HW Revision : G
Serial Number : 050438979
Product Number: BSR 64000
Fabric Interface FPGA Version: 00001000
Mac Interface FPGA Version: 00001000
CPLD Version: 0B

Slot03 CMTS 2x8 Domestic DOCSIS 2.0 CMTS, 2 Downstream x 8 Upstream Versions:
Boot ROM: RDN PPC 5.0.0.42, IXP default ixprom version
Mini ROM: CMTS2x8 Mini ROM Ver. 1.8
Image: 5.3.1P28.H44.KRBU
Date Built: Tue Jul 19 17:12:39 EDT 2011
CPU: MPC750
Memory Size: 256 MB
Format Version: 10
Assembly Type : 34
Part Number : PCA-0201-08
PDM Number : 506563-034-00
HW Revision : K
Serial Number : 070701161
Product Number: BSR 64000
Fabric Interface FPGA Version: 00001000
Mac Interface FPGA Version: 00001000
CPLD Version: 0B

Slot04 CMTS 2x8 Domestic DOCSIS 2.0 CMTS, 2 Downstream x 8 Upstream Versions:
Boot ROM: RDN PPC 5.0.0.42, IXP default ixprom version
Mini ROM: CMTS2x8 Mini ROM Ver. 1.8
Image: 5.3.1P28.H44.KRBU
Date Built: Tue Jul 19 17:12:39 EDT 2011
CPU: MPC750
Memory Size: 256 MB
Format Version: 10
Assembly Type : 34
Part Number : PCA-0201-08
PDM Number : 506563-034-00
HW Revision : AB
Serial Number : 050445017
Product Number: BSR 64000
Fabric Interface FPGA Version: 00001000
Mac Interface FPGA Version: 00001000
CPLD Version: 0B

Slot06 CMTS 2x8 Domestic DOCSIS 2.0 CMTS, 2 Downstream x 8 Upstream Versions:
Boot ROM: RDN PPC 5.0.0.31, IXP default ixprom version
Mini ROM: CMTS2x8 Mini ROM Ver. 1.8
Image: 5.3.1P28.H44.KRBU
Date Built: Tue Jul 19 17:12:39 EDT 2011
CPU: MPC750
Memory Size: 512 MB
Format Version: 10
Assembly Type : 35
Part Number : PCA-0202-06
PDM Number : 506563-022-00
HW Revision : K
Serial Number : 050073180
Product Number: BSR 64000
Fabric Interface FPGA Version: 00001000
Mac Interface FPGA Version: 00001000
CPLD Version: 0B

Slot07 Master SRM4 Versions:
Boot ROM: RDN 5.0.0.42 Created: Wed Nov 18 08:17:27 EST 2009
System Image: 5.3.1P28.H44.KRBU
Date Built: Tue Jul 19 17:13:57 EDT 2011
CPU: MPC7410-MPC8260
Memory Size: 512 MB
Format Version: 10
Assembly Type : 38
Part Number : PCA-0114-05
PDM Number : 508033-005-00
HW Revision : P
Serial Number : 070035084
Mac Address : 00:30:b8:27:10:00
Product Number: BSR 64000
SFB FPGA Version: 2031
CPLD Version: 000F

Slot08 Standby SRM4 Versions
Boot ROM: RDN 5.0.0.42 Created: Wed Nov 18 08:17:27 EST 2009
Image: 5.3.1P28.H44.KRBU
Date Built: Tue Jul 19 17:13:57 EDT 2011
CPU: MPC7410-MPC8260
Memory Size: 512 MB
Format Version: 10
Assembly Type : 38
Part Number : PCA-0114-05
PDM Number : 508033-005-00
HW Revision : L
Serial Number : 070015337
Mac Address : 00:30:b8:21:fd:00
Product Number: BSR 64000
SFB FPGA Version: 2031
CPLD Version: 000F

Slot11 DTX TX32 Domestic, 8 Downstream Ports with 4 Channels per Port Versions:
Boot ROM: 5.0.0.42
Mini ROM: TX32 Mini ROM Ver. 1.17
Image: 5.3.1P28.H44.KRBU
Date Built: Tue Jul 19 16:27:26 EDT 2011
CPU: MPC8548E rev2.1 e500v2 rev2.2
Memory Size: 1024 MB
Format Version : 11
Assembly Type : 45
PDM Number : 555461-001-00
HW Revision : W
Serial Number : K106652092200005
Switch FPGA Version: 0x0000303A
Interface FPGA Version: 0xFE020020
CPLD Version: 0xAD0E
Motherboard Revision Info:
MB Part Number : 535256-005-00
MB HW Revision : P
MB Serial Number : K106652041400234
QRM Revision Info:
Serial Number : 07160810285745900010
Revision Number : 010386290104F0202008
Product ID : 0103
Appl Fw : 8629
BootLoader Fw : 0104
HW Revision : 2008
FPGA Ver : F020
MAC32 Revision Info:
PDM Number : 536352-004-00
HW Revision : C
Serial Number : K106652050500018
FPGA ID : 5A
FPGA Ver : 28
Timing Module Revision Info:
FPGA Ver : 01040000
PIC Prot Code Rev: 0100
PIC Main Code Rev: 0102

Slot13 DTX TX32 Domestic, 8 Downstream Ports with 4 Channels per Port Versions:
Boot ROM: 5.0.0.42
Mini ROM: TX32 Mini ROM Ver. 1.19
Image: 5.3.1P28.H44.KRBU
Date Built: Tue Jul 19 16:27:26 EDT 2011
CPU: MPC8548E rev2.1 e500v2 rev2.2
Memory Size: 1024 MB
Format Version : 11
Assembly Type : 45
PDM Number : 555461-001-00
HW Revision : W
Serial Number : K106652091300102
Switch FPGA Version: 0x0000303A
Interface FPGA Version: 0xFE020020
CPLD Version: 0xAD0E
Motherboard Revision Info:
MB Part Number : 535256-005-00
MB HW Revision : P
MB Serial Number : K106652041400137
QRM Revision Info:
Serial Number : 06550810273745900017
Revision Number : 010386290104F0202008
Product ID : 0103
Appl Fw : 8629
BootLoader Fw : 0104
HW Revision : 2008
FPGA Ver : F020
MAC32 Revision Info:
PDM Number : 536352-004-00
HW Revision : C
Serial Number : K106652050500019
FPGA ID : 5A
FPGA Ver : 28
Timing Module Revision Info:
FPGA Ver : 02020010
PIC Prot Code Rev: 0100
PIC Main Code Rev: 0102

Slot14 HSIM 2-port GIGE/8-port 10/100 Ethernet (GE2/ETH8) Versions:
Boot ROM: RDN ROM Version: 5.0.0.42 Creation Date: Wed Nov 18 08:24:45 EST 2009
Image: 5.3.1P28.H44.KRBU
Date Built: Tue Jul 19 16:47:23 EDT 2011
CPU: MPC8260 PowerQUICC II
Memory Size: 256 MB
Format Version: 11
Assembly Type : 40
PDM Number : 523447-006-00
HW Revision : G
Serial Number : E106652021200228
I/O PDM Number : 523450-003-00
I/O HW Revision : A
I/O Serial Number : E106652020400009
FPFE FPGA Version: 4C0C
BufMgr FPGA Version: 1027
BufMgr Chip Version: FB

Slot15 HSIM 2-port GIGE/8-port 10/100 Ethernet (GE2/ETH8) Versions:
Boot ROM: RDN ROM Version: 5.0.0.42 Creation Date: Wed Nov 18 08:24:45 EST 2009
Image: 5.3.1P28.H44.KRBU
Date Built: Tue Jul 19 16:47:23 EDT 2011
CPU: MPC8260 PowerQUICC II
Memory Size: 256 MB
Format Version: 11
Assembly Type : 40
PDM Number : 523447-006-00
HW Revision : G
Serial Number : E106652021800018
I/O PDM Number : 523450-003-00
I/O HW Revision : A
I/O Serial Number : F106652020200078
FPFE FPGA Version: 4C0C
BufMgr FPGA Version: 1027
BufMgr Chip Version: FB