Specifications

Range Load Reg Size=0x58
Request Load Reg Size=0x0E
Minislot Size in number of Timebase Ticks is = 8
Minislot Size in Symbols = 128
Bandwidth Requests = 0x335
Piggyback Requests = 0xA
Invalid BW Requests= 0x0
Minislots Requested= 0xA52
Minislots Granted = 0xA52
Minislot Size in Bytes = 32
Map Advance (Dynamic) : 2447 usecs
UCD Count = 46476
DES Ctrl Reg#0 = C000C043, Reg#1 = 0
VXR#
You can use the show cable modem detail command to view the SNR estimate for individual cable modems.
(Please see the table below for a further explaination of SID, MAC address, Max CPE, etc.)
VXR#show cable modem detail
Interface SID MAC address Max CPE Concatenation Rx SNR
Cable6/1/U0 1 0001.64ff.e47d 1 yes 33.61
Cable6/1/U0 2 0001.9659.47bf 1 yes 31.21
Cable6/1/U0 3 0004.27ca.0e9b 1 yes 31.14
Cable6/1/U0 4 0020.4086.2704 1 yes 32.88
Cable6/1/U0 5 0002.fdfa.0a63 1 yes 33.61
SID
Service ID
MAC address
Mac address of the cable interface of the Cable Modems
Max CPE The maximum number of hosts that are simultaneously
active on the cable modem
Concatenation
Concatenation combines multiple upstream packets into
one packet to reduce packet overhead and overall latency
as well as increase transmission efficiency. Using
concatenation, a DOCSIS compliant Cable Modem makes
only one bandwidth request for multiple packets, as
opposed to making a different bandwidth request for each
individual packet.
Concatenation will only work if a single cable modem
were to have multiple voice calls each running at the
same data rate without Voice Activity Detection (VAD)
packet suppression.
Note: Concatenation may be a problem if VOIP is not
configured correctly.
Rx SNR Received Upstream SNR level at the CMTS. If the CMTS
is not configured for SNMP reads from the Cable
Modems then the CMTS will return a zero value.
The Signal to Noise Ratio (SNR) is the difference in
amplitude between a baseband signal and the noise in a
portion of the spectrum.
Cisco − Determining RF or Configuration Issues On the CMTS