Chapter 9: Upstream Cable Access Modules (UCAMs)
STANDARD Revision 1.0 C4® CMTS Release 8.3 User Guide
© 2016 ARRIS Enterprises LLC. All Rights Reserved. 291
Modem SNR Calculation
Modem SNR calculation between 12U and 24U CAM has some variation, as the table below shows:
Table 49. SNR Calculations for Modem SNR
Calculation is based on IUC4 (station maintenance)
reading only.
Burst counts threshold is 5 packets
CLI show cable modem noise
MIBs attribute:
docsIf3CmtsCmUsStatusSignalNoise
MIB attribute is based on the primary flow SNR.
Calculation is based on all IUCs except IUC1 and
IUC3.
Burst counts threshold is 50 packets
CLI show cable modem noise
MIBs attribute:
docsIf3CmtsCmUsStatusSignalNoise
MIB attribute is based on the primary flow SNR.
Calculation is based on all IUCs except IUC1 and IUC3.
Burst counts threshold is 5 packets
CLI show cable modem noise
MIBs attribute:
docsIf3CmtsCmUsStatus Signal Noise
MIB attribute is based on the primary flow SNR.
Calculation is based on all IUCs except IUC1 and
IUC3.
Burst counts threshold is 50 packets
CLI show cable modem noise
MIBs attribute:
docsIf3CmtsCmUsStatusSignalNoise
MIB attribute is based on the primary flow SNR.
CLI command show cable modem noise outputs as below
UChan UChan FEC UChan FEC UChan FEC UChan FEC
Interface USSNR Unerrored Corrected Uncorrect % Uncorrected
CM MAC address (DS-US) (db) Codewords Codewords Codewords Codewords
--------------- ------------- ------ --------- --------- --------- --------------
0015.cf9a.4c01 14/0-3/13 38.2 1064 0 0 0.00e+00
+0015.cf9a.4c01 14/0-3/0 38.6 1058 0 0 0.00e+00
+0015.cf9a.4c01 14/0-3/1 38.9 1056 0 0 0.00e+00
+0015.cf9a.4c01 14/0-3/12 38.1 1059 0 0 0.00e+00
0015.d187.3b7d 14/2-3/12 38.6 494 0 0 0.00e+00
+0015.d187.3b7d 14/2-3/0 38.5 493 0 0 0.00e+00
+0015.d187.3b7d 14/2-3/1 38.5 492 0 0 0.00e+00
+0015.d187.3b7d 14/2-3/13 38.5 492 0 0 0.00e+00
0015.cfb7.c5a1 14/2-3/13 38.0 834 0 0 0.00e+00
0015.cfb7.c5e3 14/3-3/12 38.6 498 0 0 0.00e+00
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