Specifications

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Cisco Cable Modem Termination System Feature Guide
0L-1467-02
Chapter 3 Spectrum Management for the Cisco Cable Modem Termination System
Configuration Tasks
Frequency 15.792 MHz, Channel Width 1.600 MHz, QPSK Symbol Rate 1.280 Msps
Spectrum Group 14, Last Frequency Hop Data Error: NO(0)
MC16S CNR measurement - 29 dB
Nominal Input Power Level 0 dBmV, Tx Timing Offset 2294
Ranging Backoff automatic (Start 0, End 3)
Ranging Insertion Interval automatic (60 ms)
Tx Backoff Start 0, Tx Backoff End 4
Modulation Profile Group 1
Concatenation is enabled
Fragmentation is enabled
part_id=0x3137, rev_id=0x03, rev2_id=0xFF
nb_agc_thr=0x0000, nb_agc_nom=0x0000
Range Load Reg Size=0x58
Request Load Reg Size=0x0E
Minislot Size in number of Timebase Ticks is = 8
Minislot Size in Symbols = 64
Bandwidth Requests = 0x25034
Piggyback Requests = 0x178D5
Invalid BW Requests= 0x9
Minislots Requested= 0x1F452F
Minislots Granted = 0x1F452F
Minislot Size in Bytes = 16
Map Advance (Dynamic) : 2404 usecs
UCD Count = 49803
DES Ctrl Reg#0 = C000C043, Reg#1 = 0
CMTS#
Step 4 To display the hop period and hop threshold values for each upstream, use the show cable hop command
in privileged EXEC mode:
CMTS# show cable hop
Upstream Port Poll Missed Min Missed Hop Hop Corr Uncorr
Port Status Rate Poll Poll Poll Thres Period FEC FEC
(ms) Count Sample Pcnt Pcnt (sec) Errors Errors
Cable3/0/U0 20.800 Mhz 105 0 20 0% 25% 45 1 4
Cable3/0/U1 20.800 Mhz 105 0 48 0% 25% 45 2 19
Cable3/0/U2 23.120 Mhz 105 0 45 0% 25% 45 0 5
Cable3/0/U3 22.832 Mhz 105 0 26 0% 25% 45 0 6
Cable3/0/U4 22.896 Mhz 105 0 43 0% 25% 45 0 7
Cable3/0/U5 23.040 Mhz 105 0 54 0% 25% 45 1 3
Cable4/0/U0 22.896 Mhz 117 0 26 0% 25% 45 0 2
Cable4/0/U1 23.168 Mhz 117 0 87 0% 25% 45 4 2
Cable4/0/U2 22.896 Mhz 117 0 23 0% 25% 45 1 0
Cable4/0/U3 20.800 Mhz 117 0 54 0% 25% 45 0 0
Cable4/0/U4 22.928 Mhz 117 0 22 0% 25% 45 0 1
Cable4/0/U5 22.960 Mhz 117 0 0 ----- 25% 45 0 0
CMTS#
Step 5 To display the assignment of each spectrum group, use the show cable spectrum-group command in
privileged EXEC mode:
CMTS# show cable spectrum-group
Group Frequency Upstream Weekly Scheduled Power Shared
No. Band Port Availability Level Spectrum
(Mhz) From Time: To Time: (dBmV)
1 6.000-11.000 0 No
2 12.000-17.000 0 No
3 18.000-23.000 0 No
4 24.000-29.000 0 No
6 36.000-41.000 0 No
10 15.000-20.000 0 No
11 15.000-20.000 0 No