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ubr 7200 (forget which model) timing offset errors

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Thu, 11/08/2012 - 09:09
#1
stephend2
ubr 7200 (forget which model) timing offset errors

Below is the output of show cable modem and the running config.

edit: downstream is 256qam, upstream is qpsk currently.

I'm seeing quite a few with ! by timing offset, also we are still seeing quite a few modem flapping with seemingly good stats, on the ones we have verified, downstream snr is 35 +, upstream snr is 26 + and they seem to pass traffic fine most of the time, but every now and then they just start flapping with no explanation, by the time we get someone out to the site everything is back to normal.

This does not seem to be isolated to a single node, its happening all over the system.

I have just taken over the data side of things here, the previous person passed away recently. I'm trying to get a grasp on what is going on as I'm only used to dealing with small mdu stuff up to 100 modems or so.

I already know about the return problems for some modems, we are working on that.

Any best practices on cisco ubr I should be aware of ? I come from mainly arris cmts 1000/1500.

Also note that I do understand the cmts is open to any modem currently, there was a major failure and we're trying to get new provisioning up, I put this config in to get a bunch of angry internet customers up and running while we redo the provisioning system. I should have this in order by this weekend and moved back over.

cable-ubr-bu#sh run
Building configuration...

Current configuration : 4928 bytes
!
version 12.1
service timestamps debug datetime localtime show-timezone
service timestamps log datetime localtime show-timezone
service password-encryption
!
hostname cable-ubr-bu
!
boot system disk0:ubr7200-ik1s-mz.121-22.EC.bin
boot bootldr bootflash:
logging buffered 20496 notifications

!
cable modem max-cpe 5
cable modulation-profile 4 request 0 16 0 8 qpsk scrambler 152 no-diff 64 fixed uw16
cable modulation-profile 4 initial 5 34 0 48 qpsk scrambler 152 no-diff 128 fixed uw16
cable modulation-profile 4 station 5 34 0 48 qpsk scrambler 152 no-diff 128 fixed uw16
cable modulation-profile 4 short 6 75 6 8 16qam scrambler 152 no-diff 144 fixed uw16
cable modulation-profile 4 long 8 220 0 8 16qam scrambler 152 no-diff 160 fixed uw16
no cable qos permission create
no cable qos permission update
cable qos permission modems
cable time-server
!
cable config-file belzoni.cm
service-class 1 max-upstream 256
service-class 1 guaranteed-upstream 56
service-class 1 max-downstream 1500
service-class 1 max-burst 1600
cpe max 5
timestamp
!
cable config-file 3m512k.cm
service-class 1 max-upstream 512
service-class 1 guaranteed-upstream 128
service-class 1 max-downstream 3000
service-class 1 max-burst 1600
cpe max 5
timestamp
!
cable config-file 10m1m.cm
service-class 1 max-upstream 1000
service-class 1 guaranteed-upstream 128
service-class 1 max-downstream 11000
service-class 1 max-burst 1600
cpe max 5
timestamp
!
fastether transmit store_and_forward enable
clock timezone CST -6
clock summer-time CDT recurring
ip subnet-zero
ip cef
!
!
no ip domain-lookup
!
ip dhcp pool cm-belzoni
network 10.10.0.0 255.255.0.0
bootfile belzoni.cm
next-server 10.10.0.1
default-router 10.10.0.1
option 7 ip 10.10.0.1
option 4 ip 10.10.0.1
option 2 hex ffff.8f80
lease 7 0 10
!
ip dhcp pool pcs-105
network 74.174.205.0 255.255.255.0
next-server 74.174.205.1
domain-name belzonicable.com
default-router 74.174.205.1
dns-server 208.67.222.222 208.67.220.220
lease 7 0 10
!
ip dhcp pool pcs-106
network 74.174.206.0 255.255.255.0
next-server 74.174.206.1
domain-name belzonicable.com
default-router 74.174.206.1
dns-server 208.67.222.222 208.67.220.220
lease 7 0 10
!
ip dhcp pool pcs-207
network 74.174.207.0 255.255.255.0
next-server 74.174.207.1
default-router 74.174.207.1
domain-name belzonicable.com
dns-server 74.174.204.21 74.174.204.19
lease 7 0 10
!
ip dhcp pool insurance-modem
host 10.10.5.106 255.255.0.0
client-identifier 0100.159a.e851.40
bootfile 10m1m.cm
next-server 10.10.0.1
default-router 10.10.0.1
option 7 ip 10.10.0.1
option 4 ip 10.10.0.1
option 2 hex ffff.8f80
lease 7 0 10
!
ip dhcp pool dana-modem
host 10.10.1.219 255.255.0.0
client-identifier 0100.111a.e3fd.50
bootfile 10m1m.cm
next-server 10.10.0.1
default-router 10.10.0.1
option 7 ip 10.10.0.1
option 4 ip 10.10.0.1
option 2 hex ffff.8f80
lease 7 0 10
!
ip ssh time-out 120
ip ssh authentication-retries 3
!
!
!
!
!
interface FastEthernet0/0
description UBR1 Fastethernet
ip address 74.174.204.4 255.255.255.192
no ip redirects
no ip proxy-arp
ip route-cache same-interface
no ip mroute-cache
full-duplex
no cdp enable
!
interface Cable2/0
ip address 74.174.205.1 255.255.255.0 secondary
ip address 74.174.206.1 255.255.255.0 secondary
ip address 74.174.207.1 255.255.255.0 secondary
ip address 10.10.0.1 255.255.0.0
ip access-group 105 in
no ip mroute-cache
no keepalive
no cable packet-cache
cable downstream rate-limit token-bucket shaping
cable downstream annex B
cable downstream modulation 256qam
cable downstream interleave-depth 32
cable downstream frequency 513000000
cable downstream channel-id 0
cable upstream 0 frequency 34000000
cable upstream 0 power-level 0
no cable upstream 0 shutdown
cable upstream 1 frequency 34000000
cable upstream 1 power-level 0
no cable upstream 1 shutdown
cable upstream 2 frequency 34000000
cable upstream 2 power-level 0
no cable upstream 2 shutdown
cable upstream 3 frequency 34000000
cable upstream 3 power-level 0
no cable upstream 3 shutdown
cable upstream 4 frequency 34000000
cable upstream 4 power-level 0
no cable upstream 4 shutdown
cable upstream 5 frequency 34000000
cable upstream 5 power-level 0
no cable upstream 5 shutdown
cable source-verify
cable dhcp-giaddr policy
!
ip classless
no ip forward-protocol udp netbios-ns
no ip forward-protocol udp netbios-dgm
ip route 0.0.0.0 0.0.0.0 74.174.204.1
no ip http server
no ip http secure-server
!
no cdp run
snmp-server community cable36 RO
tftp-server server
!
line con 0
stopbits 1
line aux 0
stopbits 1
line vty 0 4
no login
line vty 5 15
no login
!
scheduler allocate 4000 400
ntp clock-period 17179984
ntp source FastEthernet0/0
ntp server 74.174.204.57 source FastEthernet0/0
!
end

cable-ubr-bu#

cable-ubr-bu#show cable modem
Interface Prim Online Timing Rec QoS CPE IP address MAC address
Sid State Offset Power
Cable2/0/U1 1 online !1154 -0.25 5 0 10.10.0.223 0019.5ef7.a138
Cable2/0/U0 2 online !1775 0.00 5 1 10.10.3.104 001a.6657.0b7c
Cable2/0/U3 3 online !2760 0.25 5 1 10.10.2.132 000f.9fa9.f440
Cable2/0/U0 4 online 1714 0.25 5 1 10.10.2.54 001a.6679.291c
Cable2/0/U2 5 online 1515 -0.50 5 0 10.10.3.117 0019.5eee.238e
Cable2/0/U3 6 online 2733 0.00 5 1 10.10.0.65 0012.2571.4076
Cable2/0/U0 7 online 1739 1.00 5 0 10.10.1.210 001a.de85.1b6c
Cable2/0/U3 8 online !1935 -0.50 5 0 10.10.1.107 001a.667a.3220
Cable2/0/U2 9 online !1508 -0.25 5 0 10.10.3.139 001e.4683.c54e
Cable2/0/U3 10 online !1931 0.25 5 1 10.10.2.33 001e.46bf.9650
Cable2/0/U0 11 online 1685 0.25 5 0 10.10.1.242 001e.46c6.cb18
Cable2/0/U2 12 online 1485 0.25 5 1 10.10.3.98 001e.46ae.30d2
Cable2/0/U3 13 online 1945 0.00 5 1 10.10.2.15 001a.de77.a5c0
Cable2/0/U4 14 online !2524 -0.25 5 1 10.10.1.43 0012.2505.7c90
Cable2/0/U4 15 online 1719 -0.25 5 1 10.10.2.168 0012.2585.40aa
Cable2/0/U3 16 online !1994 0.50 5 1 10.10.2.40 0012.2584.e0c4
Cable2/0/U2 17 online !2229 -0.25 5 1 10.10.2.26 0011.aea2.f130
Cable2/0/U0 18 online !2478 0.25 5 1 10.10.0.245 0012.2502.1106
Cable2/0/U2 19 online 1540 -0.50 5 0 10.10.3.141 001e.4683.99b8
Cable2/0/U4 20 online !1762 0.50 5 1 10.10.3.105 0018.c0c5.1e08
Cable2/0/U0 21 online 2482 0.75 5 0 10.10.0.91 0011.aea8.5596
Cable2/0/U2 22 online 2277 -0.75 5 1 10.10.1.36 000f.9fa9.f42e
Cable2/0/U0 23 online 2492 0.25 5 0 10.10.1.225 0012.2502.0eac
Cable2/0/U4 25 online !1791 0.00 5 1 10.10.2.158 0023.747e.3fa0
Cable2/0/U0 26 online !1668 0.75 5 1 10.10.1.181 001a.6692.cc9a
Cable2/0/U2 27 online !2276 0.25 5 1 10.10.2.56 000e.5c44.e6b4
Cable2/0/U2 29 online !2264 0.25 5 1 10.10.1.218 000e.5cda.a50c
Cable2/0/U2 30 online !2235 -0.50 5 1 10.10.0.237 000f.9fa9.f458
Cable2/0/U4 31 online !2451 -0.25 5 1 10.10.0.100 0012.c922.2b7a
Cable2/0/U4 32 online !1774 -0.25 5 2 10.10.2.173 0019.5ef0.34c0
Cable2/0/U4 33 online !2469 0.25 5 1 10.10.1.38 0011.aefe.df6e
Cable2/0/U2 34 online !1575 -0.50 5 0 10.10.1.241 0014.04b6.0530
Cable2/0/U4 35 online !2480 0.50 5 0 10.10.2.128 0012.2502.0e64
Cable2/0/U4 37 online !2469 0.75 5 0 10.10.0.64 000e.5ce7.30e2
Cable2/0/U2 38 online !2267 -0.50 5 1 10.10.2.105 0011.aea8.5592
Cable2/0/U0 39 online 2472 !-1.75 5 1 10.10.0.96 000e.5c70.679a
Cable2/0/U4 40 online !1722 0.50 5 1 10.10.1.152 001a.6694.31cc
Cable2/0/U0 41 online !1669 0.25 5 0 10.10.2.63 0023.7462.37ae
Cable2/0/U3 42 online !1994 -0.25 5 1 10.10.2.66 0023.7462.059e
Cable2/0/U3 43 online !1959 -0.25 5 1 10.10.2.145 0023.746a.c3a2
Cable2/0/U0 44 online 1688 -0.25 5 1 10.10.1.205 001e.4683.99b6
Cable2/0/U0 45 online !1919 !0.50 5 1 10.10.1.14 0011.aec4.37d2
Cable2/0/U3 46 online 2197 0.00 5 1 10.10.1.102 0011.aec9.d240
Cable2/0/U3 48 offline 1477 -0.50 2 0 10.10.0.38 000b.06cb.aa50
Cable2/0/U2 49 online 2292 -0.50 5 1 10.10.1.30 0012.c90f.7638
Cable2/0/U2 50 online 1478 -0.50 5 0 10.10.1.238 0023.7490.e314
Cable2/0/U0 51 online !1715 0.50 5 1 10.10.1.166 0023.7452.38be
Cable2/0/U2 52 online !1491 -0.50 5 1 10.10.3.103 001e.467d.d146
Cable2/0/U4 53 online 1734 0.25 5 1 10.10.1.109 001e.46ad.0718
Cable2/0/U2 54 offline 1507 -0.25 2 0 10.10.1.190 001e.46ad.b006
Cable2/0/U3 58 online !2719 0.00 5 1 10.10.2.29 000c.e532.1940
Cable2/0/U4 59 online 1702 0.00 5 1 10.10.2.162 001e.46a9.90d2
Cable2/0/U2 60 online 1732 0.00 5 1 10.10.0.83 0014.e8b6.e38e
Cable2/0/U1 61 online !1237 -0.75 5 1 10.10.0.4 001a.de73.6486
Cable2/0/U2 62 online 1482 0.00 5 1 10.10.2.101 001a.6692.838e
Cable2/0/U0 63 online !1743 0.25 5 1 10.10.2.14 0025.f2bd.a06a
Cable2/0/U4 64 online !1697 0.50 5 0 10.10.1.74 0024.a0ea.cfed
Cable2/0/U3 65 online !1932 0.00 5 0 10.10.2.90 001a.dea5.db6e
Cable2/0/U0 66 online 1742 0.00 5 0 10.10.1.245 001a.de85.03a8
Cable2/0/U4 67 online !1728 -0.50 5 0 10.10.1.150 0019.5ef0.0876
Cable2/0/U3 68 online 1955 -0.25 5 1 10.10.1.240 001a.de73.4868
Cable2/0/U2 69 online !1478 0.25 5 1 10.10.1.156 001e.46c6.54ca
Cable2/0/U2 70 online !1538 0.00 5 1 10.10.3.68 001e.46ab.e024
Cable2/0/U2 71 online 1507 -0.75 5 1 10.10.3.132 001e.46a6.afd2
Cable2/0/U2 72 online 1534 -0.25 5 1 10.10.3.77 001e.467d.c514
Cable2/0/U2 73 online !1518 0.00 5 1 10.10.3.85 0018.c0d0.41d6
Cable2/0/U3 74 online 1991 -0.50 5 1 10.10.2.34 0019.5ef1.cbbe
Cable2/0/U4 75 online !1684 -0.25 5 1 10.10.2.148 001a.de96.3dd4
Cable2/0/U4 76 online !1730 0.00 5 1 10.10.2.190 0024.a0eb.50e0
Cable2/0/U4 77 online !1681 -0.25 5 0 10.10.1.185 0024.a0ea.8c50
Cable2/0/U0 78 online 1252 *0.00 5 0 10.10.0.125 0020.409b.682c
Cable2/0/U3 79 online 1426 -1.00 5 1 10.10.0.108 0020.40b8.c500
Cable2/0/U0 80 online 1966 0.75 5 1 10.10.1.59 0012.2501.dfa4
Cable2/0/U3 81 online 2173 -0.50 5 0 10.10.1.6 0012.c9cb.01c2
Cable2/0/U3 82 online 1561 0.25 5 0 10.10.0.255 000b.0602.aadc
Cable2/0/U2 83 online 1026 -0.50 5 1 10.10.1.22 0020.409a.ab14
Cable2/0/U2 84 online 1025 -0.75 5 1 10.10.0.166 0004.bd0e.902a
Cable2/0/U2 85 online 1052 0.00 5 1 10.10.0.107 0004.bd0e.902c
Cable2/0/U3 86 online 1421 0.50 5 1 10.10.1.10 0004.bdcd.fdd8
Cable2/0/U0 88 online 1255 0.25 5 1 10.10.0.131 000b.0602.eaf8
Cable2/0/U1 89 online !1946 0.50 5 1 10.10.2.19 0011.aec7.270e
Cable2/0/U0 90 online !2464 0.25 5 1 10.10.0.12 000e.5ce0.bd12
Cable2/0/U3 91 online !1912 0.50 5 0 10.10.1.177 0023.7469.b7cc
Cable2/0/U0 92 online !1671 0.25 5 1 10.10.2.149 001a.6657.5a58
Cable2/0/U4 93 online 1684 -0.50 5 0 10.10.2.134 0024.a0eb.50c5
Cable2/0/U4 94 online !1750 0.25 5 1 10.10.2.178 0024.a0ea.cf8b
Cable2/0/U2 95 online 1508 1.00 5 0 10.10.2.65 0023.ee26.b6da
Cable2/0/U0 96 online !1689 0.75 5 0 10.10.2.104 001a.6694.2830
Cable2/0/U2 98 online 1037 -0.25 5 0 10.10.0.84 0020.404b.8008
Cable2/0/U0 99 online !1670 0.00 5 1 10.10.2.39 0024.a0ea.8c9f
Cable2/0/U0 100 online 1744 0.75 5 1 10.10.3.35 0023.747a.e4b4
Cable2/0/U2 101 online !1515 -0.50 5 1 10.10.3.126 a47a.a46b.3ea7
Cable2/0/U0 102 online 1246 0.50 5 1 10.10.0.250 0020.404a.ae78
Cable2/0/U2 103 online 1525 0.00 5 1 10.10.3.142 0023.ee26.af98
Cable2/0/U2 104 online 1543 -0.25 5 0 10.10.2.80 0014.04b6.04c4
Cable2/0/U4 105 online !1718 0.25 5 1 10.10.2.135 0024.a0eb.50c9
Cable2/0/U0 106 online 1750 0.75 5 1 10.10.2.49 001a.6678.4f16
Cable2/0/U4 107 online !1738 0.50 5 1 10.10.0.205 0023.7464.da1c
Cable2/0/U0 108 offline !1739 0.25 2 0 10.10.2.75 0023.ee26.b6e0
Cable2/0/U2 109 online 2320 !-2.75 5 1 10.10.2.154 0012.c9df.ba94
Cable2/0/U2 110 online !1478 0.25 5 1 10.10.2.32 001a.de9d.df8a
Cable2/0/U0 111 online !1738 0.00 5 1 10.10.1.235 0014.04b7.3816
Cable2/0/U2 112 online !1495 -0.25 5 1 10.10.2.30 001e.4683.c56e
Cable2/0/U2 113 init(r1) !1504 !-0.25 2 1 10.10.3.11 0024.a0ea.ce8e
Cable2/0/U0 114 online !1730 0.00 5 1 10.10.2.124 0023.ee26.b6f8
Cable2/0/U0 115 online !1748 -0.25 5 1 10.10.3.106 001e.46c2.4058
Cable2/0/U4 116 online 1255 -0.25 5 0 10.10.0.112 0004.bd04.1946
Cable2/0/U2 117 online 1045 -0.50 5 1 10.10.0.109 0020.4052.b842
Cable2/0/U4 118 online 1959 0.00 5 1 10.10.1.60 0011.aea2.2d82
Cable2/0/U4 119 online 1185 -0.25 5 1 10.10.0.124 0020.4052.68a4
Cable2/0/U0 120 online 1319 0.75 5 1 10.10.1.0 0020.404a.ae7c
Cable2/0/U1 121 online !1948 -0.25 5 1 10.10.1.216 000c.e531.d0c2
Cable2/0/U2 122 online 2464 -0.75 5 1 10.10.1.192 0020.40b8.c580
Cable2/0/U3 123 online !2722 0.75 5 1 10.10.1.227 000c.e531.979e
Cable2/0/U4 124 online 1289 0.75 5 1 10.10.0.106 0020.4041.e648
Cable2/0/U2 126 online 992 0.25 5 1 10.10.1.73 0004.bd0c.e0b0
Cable2/0/U0 127 online 1261 0.75 5 1 10.10.0.49 000b.06cb.aa52
Cable2/0/U0 128 online 1228 0.25 5 1 10.10.0.247 000b.06cb.a166
Cable2/0/U0 129 online 1913 0.75 5 1 10.10.1.20 0017.ee52.873a
Cable2/0/U4 130 online 1983 0.75 5 1 10.10.1.129 0015.9a6c.a1ce
Cable2/0/U0 131 online 1910 0.25 5 1 10.10.1.2 0012.256c.8826
Cable2/0/U4 132 online 2000 0.00 5 0 10.10.0.246 0011.aec6.36d6
Cable2/0/U1 133 online 1910 -0.25 5 1 10.10.1.233 0011.ae05.2262
Cable2/0/U2 134 online !2311 0.00 5 4 10.10.2.59 000e.5ce5.322e
Cable2/0/U3 135 online !2750 0.25 5 1 10.10.0.221 000f.9fa9.f470
Cable2/0/U0 136 online 2509 0.75 5 1 10.10.2.142 000c.e5ec.b2ac
Cable2/0/U4 137 online !2558 0.75 5 1 10.10.2.122 000e.5ce5.3230
Cable2/0/U3 138 online 1989 -0.25 5 1 10.10.0.63 001e.4683.c10a
Cable2/0/U0 139 online !1695 0.75 5 1 10.10.1.254 0024.a1aa.951d
Cable2/0/U0 140 online !2520 0.25 6 1 10.10.1.219 0011.1ae3.fd50
Cable2/0/U2 141 online 1555 -0.50 5 1 10.10.3.124 0024.a0ea.d16c
Cable2/0/U0 142 online !1744 0.50 5 1 10.10.2.191 0024.a0ea.8c81
Cable2/0/U2 143 online !1541 -0.75 5 1 10.10.1.231 001e.46a9.28d8
Cable2/0/U0 144 online !1784 0.00 5 1 10.10.3.112 0023.a27b.66a6
Cable2/0/U0 145 online !1676 0.25 5 1 10.10.2.99 0023.a27d.f24d
Cable2/0/U2 146 online !1530 0.50 5 1 10.10.3.56 001a.666a.b0ea
Cable2/0/U2 147 online 1535 !-1.75 5 1 10.10.1.248 0018.c0d0.6250
Cable2/0/U3 148 online 1505 0.75 5 0 10.10.1.104 0020.404c.c8f4
Cable2/0/U0 149 online !2501 0.75 5 1 10.10.1.137 000e.5c70.6798
Cable2/0/U2 150 online 1720 -0.25 5 1 10.10.1.11 0013.711b.673a
Cable2/0/U4 151 online 1899 -0.25 5 1 10.10.1.7 0011.aea9.22cc
Cable2/0/U3 152 online 2876 0.25 5 1 10.10.1.215 0004.bdce.4086
Cable2/0/U0 153 online 1291 0.75 5 0 10.10.1.28 0008.0ee4.d578
Cable2/0/U0 154 online 1278 0.00 5 1 10.10.0.55 0004.bd04.181e
Cable2/0/U0 155 online 1317 0.25 5 1 10.10.0.226 0008.0ee4.d5b4
Cable2/0/U0 156 online 1968 0.00 5 1 10.10.2.208 0011.aea4.47b4
Cable2/0/U0 157 online 1961 0.25 5 0 10.10.1.95 0017.ee5a.2286
Cable2/0/U3 158 online !1902 -0.25 5 0 10.10.2.106 0012.2585.11b2
Cable2/0/U4 159 online !1690 -0.25 5 0 10.10.2.175 0023.7451.d9c0
Cable2/0/U4 160 online !1760 0.25 5 1 10.10.2.157 a47a.a46b.3ea1
Cable2/0/U2 161 online 1509 -0.75 5 1 10.10.2.140 0023.7491.660e
Cable2/0/U4 162 online !1749 0.75 5 1 10.10.2.167 0025.f232.7b21
Cable2/0/U4 163 online !1767 -0.25 5 0 10.10.2.88 0024.a0eb.5a5f
Cable2/0/U2 164 online 2261 -0.25 5 1 10.10.2.24 0011.aea8.558c
Cable2/0/U2 165 online !1487 -0.75 5 1 10.10.0.3 0019.5eed.437c
Cable2/0/U4 166 online !1730 0.25 5 0 10.10.2.94 0023.7473.403c
Cable2/0/U0 167 online 1940 0.75 5 1 10.10.1.97 0015.2fb8.a4d2
Cable2/0/U2 168 online 1023 -0.25 5 0 10.10.0.46 0020.40b2.c444
Cable2/0/U4 169 online 1273 0.00 5 0 10.10.0.103 0020.4052.6872
Cable2/0/U3 170 online 1545 0.00 5 0 10.10.0.45 000b.06a2.d812
Cable2/0/U2 171 online 1047 -0.75 5 0 10.10.0.57 0020.4047.419c
Cable2/0/U2 172 online 1063 *0.50 5 0 10.10.0.244 0020.4051.d1cc
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Cable2/0/U4 410 online 1725 0.25 5 0 10.10.1.197 0023.7468.4548
Cable2/0/U2 411 online !1512 0.25 5 1 10.10.2.47 0024.a0ea.ce5a
Cable2/0/U4 413 online !1716 0.50 5 0 10.10.1.207 0018.c0d0.6210
Cable2/0/U4 414 online !1718 0.50 5 1 10.10.1.116 0024.a0eb.5aea
Cable2/0/U4 416 online 2546 0.50 5 1 10.10.2.120 000c.e532.198a
Cable2/0/U0 417 online 2493 0.25 5 0 10.10.2.130 000c.e532.95e2
Cable2/0/U4 418 online 1675 *0.00 5 1 10.10.2.207 0023.7466.f9f2
Cable2/0/U4 419 online !1711 0.50 5 1 10.10.2.160 001a.de8f.2472
Cable2/0/U4 420 online 1179 *0.00 5 1 10.10.0.159 0004.bdcd.fde2
Cable2/0/U2 421 online !1508 -0.25 5 0 10.10.3.108 001e.46ad.0778
Cable2/0/U2 422 online !1491 0.75 5 1 10.10.2.74 0024.a0eb.5ae9
Cable2/0/U4 423 online !1682 0.75 5 1 10.10.2.159 0024.a0ea.8c48
Cable2/0/U3 424 online !1938 -0.50 5 1 10.10.2.233 0024.a0ea.8c5e
Cable2/0/U2 425 online 1503 0.00 5 1 10.10.2.52 0024.a0eb.50d2
Cable2/0/U0 426 online !1685 0.00 5 1 10.10.1.92 0015.9a3c.1442
Cable2/0/U3 427 online 1936 0.00 5 1 10.10.2.232 0018.c0c8.0e12
Cable2/0/U0 428 online !1743 1.00 5 1 10.10.1.229 0023.745f.0630
Cable2/0/U2 429 online !1513 0.25 5 1 10.10.3.123 0023.7454.3870
Cable2/0/U2 430 online !1527 -0.50 5 1 10.10.3.135 0024.a0ea.8c74
Cable2/0/U1 431 online !1134 0.00 5 0 10.10.2.194 0024.a0ea.8c7c
Cable2/0/U2 432 online !1528 0.00 5 1 10.10.2.186 0024.a0ea.ce91
Cable2/0/U2 433 online 1542 -0.50 5 0 10.10.3.92 0015.9a68.e626
Cable2/0/U2 434 online !1491 0.25 5 1 10.10.2.181 0024.a0ea.ce83
Cable2/0/U2 435 online 1543 0.25 5 0 10.10.3.70 001a.de8e.9ff2
Cable2/0/U0 436 online !1726 1.00 5 1 10.10.3.114 0023.a278.511f
Cable2/0/U2 437 online !1558 0.00 5 1 10.10.2.92 0024.a0ea.8c4f
Cable2/0/U3 438 online !1930 0.50 5 1 10.10.2.23 0023.7462.41ba
Cable2/0/U2 439 online 1552 0.00 5 0 10.10.3.136 001e.46b0.14b2
Cable2/0/U2 440 online 1506 -0.75 5 0 10.10.2.91 0024.a0ea.ce5f
Cable2/0/U3 441 online !1991 0.25 5 1 10.10.2.166 0023.7494.518c
Cable2/0/U0 442 online !1702 0.00 5 0 10.10.2.174 0023.7461.ab96
Cable2/0/U0 443 online !1751 0.75 5 1 10.10.2.156 000f.9fe5.7470
Cable2/0/U4 444 online !2528 0.75 5 1 10.10.0.165 000c.e532.d478
Cable2/0/U0 445 online !2485 0.50 5 1 10.10.2.25 000c.e532.d534
Cable2/0/U4 447 online !2520 0.00 5 1 10.10.2.107 000c.e532.963a
Cable2/0/U4 448 online !2467 0.00 5 0 10.10.2.129 000c.e531.9778
Cable2/0/U0 449 online !1747 0.75 5 1 10.10.1.85 001a.de8f.27c6
Cable2/0/U2 450 online !1507 0.50 5 0 10.10.2.161 001a.de85.2c50
Cable2/0/U0 451 online 1731 1.00 5 1 10.10.1.249 0018.c0d8.3aee
Cable2/0/U4 452 online !1737 0.25 5 0 10.10.2.85 0023.7470.c2be
Cable2/0/U0 453 online !1754 1.25 5 0 10.10.2.13 0023.7452.3df8
Cable2/0/U0 454 online !1746 0.25 5 1 10.10.2.96 0023.ee26.ec7c
Cable2/0/U2 455 online !1528 0.00 5 1 10.10.2.195 0025.f104.cd1a
Cable2/0/U3 457 online !2718 1.25 5 3 10.10.2.197 0012.2598.912a
Cable2/0/U3 458 online 2156 !-0.75 5 1 10.10.2.198 0012.25d9.e214
Cable2/0/U3 459 online !1950 0.75 5 1 10.10.2.202 001e.46ad.072c
Cable2/0/U4 461 online 1734 -0.25 5 1 10.10.2.200 001a.668f.aeb2
Cable2/0/U0 463 online 1919 -0.25 5 0 10.10.2.204 0012.2573.d130
Cable2/0/U2 465 offline !1497 -0.50 2 1 10.10.2.206 001a.de99.fb4c
Cable2/0/U2 466 offline 1493 -0.25 2 0 10.10.2.209 0024.a0eb.514d
Cable2/0/U3 468 online 1559 -0.25 5 1 10.10.2.212 0008.0ee4.d6c0
Cable2/0/U2 471 online 1479 -0.50 5 1 10.10.2.215 0023.7464.da2a
Cable2/0/U4 472 online 1733 0.75 5 1 10.10.2.216 0024.a0ea.ce6e
Cable2/0/U2 474 online !2238 -0.25 5 1 10.10.2.218 0012.2502.0eb0
Cable2/0/U2 476 init(r2) !1552 !-11.25 2 1 10.10.2.220 001e.46ab.e710
Cable2/0/U4 479 online !1947 0.25 5 0 10.10.2.222 0013.7114.1732
Cable2/0/U2 483 offline !2316 0.50 2 1 10.10.2.226 000e.5c6d.11e8
Cable2/0/U2 484 online !1484 -0.75 5 1 10.10.3.127 7cbf.b160.4173
Cable2/0/U2 486 online 1558 0.25 5 1 10.10.3.125 0017.ee63.75b2
Cable2/0/U2 487 online !1523 -0.50 5 1 10.10.3.133 0012.2585.570e
Cable2/0/U2 489 online 2302 0.00 5 1 10.10.2.234 000c.e531.97a0
Cable2/0/U0 494 online 1752 1.00 5 1 10.10.2.239 001a.de9e.96c0
Cable2/0/U2 495 online 1515 0.00 5 1 10.10.3.52 001a.de69.f46c
Cable2/0/U0 500 online !1742 0.25 5 1 10.10.2.153 0023.7480.8e74
Cable2/0/U3 501 online !1963 -0.50 5 1 10.10.2.244 0023.ee26.b6c8
Cable2/0/U4 502 online 1307 0.00 5 0 10.10.2.245 0008.0eaf.5cc0
Cable2/0/U4 503 online 1946 -0.50 5 0 10.10.2.214 0014.0455.f3a4
Cable2/0/U2 504 online 1723 -0.75 5 0 10.10.2.246 0012.c922.5d3c
Cable2/0/U2 505 offline 1057 0.75 2 0 10.10.2.228 000b.06ca.b49a
Cable2/0/U3 506 online 2167 -0.25 5 0 10.10.2.201 0013.7186.99de
Cable2/0/U3 507 online 2681 -0.50 5 1 10.10.2.196 000e.5c70.6796
Cable2/0/U4 508 online 2506 -0.75 5 0 10.10.1.39 0011.aefd.ba7e
Cable2/0/U4 511 online 1761 0.75 5 0 10.10.2.251 0023.747e.3e38
Cable2/0/U0 513 online 1722 0.00 5 1 10.10.2.252 001a.665a.0a30
Cable2/0/U3 514 online 2125 !-0.75 5 1 10.10.1.70 0017.ee5a.be0a
Cable2/0/U4 515 online 1734 0.25 5 1 10.10.2.188 0023.7469.86fa
Cable2/0/U4 516 offline 1933 0.50 2 0 10.10.3.18 0005.ca52.f478
Cable2/0/U4 517 online 1721 -0.25 5 1 10.10.3.19 a47a.a46a.8b65
Cable2/0/U2 518 online 2277 -0.75 5 1 10.10.2.71 000c.e532.18e4
Cable2/0/U2 519 online 1578 -0.50 5 1 10.10.3.143 a47a.a46a.8b38
Cable2/0/U2 520 online 1768 0.00 5 1 10.10.3.21 000f.9f79.6c10
Cable2/0/U0 521 online 1669 0.25 5 1 10.10.3.22 a47a.a476.0b01
Cable2/0/U0 522 online 1683 0.00 5 1 10.10.3.23 a47a.a46a.8b75
Cable2/0/U0 524 online 1276 0.50 5 0 10.10.0.249 0020.409b.671c
Cable2/0/U4 526 online 1788 0.75 5 1 10.10.3.34 a47a.a476.0b4c
Cable2/0/U4 529 offline 1756 -0.75 2 0 10.10.2.243 0023.ee26.b0b7
Cable2/0/U2 531 offline 1764 *-0.50 2 0 10.10.2.221 0014.e8b4.c3e6
Cable2/0/U3 532 online 2688 -0.25 5 1 10.10.2.67 0011.aea8.558e
Cable2/0/U2 536 online 1517 0.25 5 0 10.10.3.79 0023.746a.c74e
Cable2/0/U2 537 online 1549 0.25 5 1 10.10.3.116 a47a.a46a.8af7
Cable2/0/U0 539 online 1731 0.25 5 0 10.10.3.43 001a.de77.95d0
Cable2/0/U3 540 offline 2003 -0.25 2 0 10.10.2.241 0024.a0eb.54f5
Cable2/0/U3 541 online 1927 -0.50 5 0 10.10.3.44 a47a.a476.0b38
Cable2/0/U4 542 online 1315 0.75 5 1 10.10.2.210 000b.0602.aae8
Cable2/0/U2 543 online 1010 -0.75 5 0 10.10.0.39 0020.40b0.7c18
Cable2/0/U4 544 online 1722 -0.75 5 1 10.10.3.45 a47a.a46a.8add
Cable2/0/U2 545 online 1472 -0.25 5 1 10.10.3.46 a47a.a46a.8ad3
Cable2/0/U3 547 offline 1939 -0.25 2 0 10.10.3.47 001a.665c.2e78
Cable2/0/U0 548 online 1686 0.25 5 0 10.10.2.223 0025.f2bc.e48d
Cable2/0/U4 549 online 1757 -0.25 5 0 10.10.3.48 001a.de77.b5aa
Cable2/0/U2 551 online 1558 0.00 5 1 10.10.3.100 0024.a0ea.8c9a
Cable2/0/U0 552 offline 1688 0.00 2 0 10.10.3.51 0023.7467.fe06
Cable2/0/U0 553 online 1971 0.75 5 0 10.10.0.252 0013.711d.0d60
Cable2/0/U2 554 offline 1535 !-28.75 2 0 0.0.0.0 0023.ed9c.2c12
Cable2/0/U4 555 offline 1789 0.25 2 0 10.10.2.199 0023.ee26.b097

cable-ubr-bu#

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Thu, 11/08/2012 - 17:56
mbowe
what linecard, and some suggestions

what model linecard do you have? (eg look in "show inventory"). Also would be worth telling us which NPE you have eg NPE-400, NPE-G1 (look in "show ver")

If it was me, the very first thing I would do is setup some graphing of the USSNR for each upstream so you can view the trends and see if bursts of noise are taking your modems offline

Then I would turn on cable modem remote-query (makes it easier to see the levels each for each modem). Once it's collected data its pretty easy to eg cut-paste it into excel and then have a look at average levels and this will tell you if are running the correct US and DS attenuators in the headend.

Then (depending on the linecard you have) you could look at doing things like :
- turn on ingress-noise-cancellation and equalization-coefficient for each upstream (these help counter noise problems)
- swapping to using a spectrum group rather than fixed upstream frequencies. This allows the CMTS to automatically move the upstream into the cleanest upstream spectrum.
- perhaps read up on on cable map-advance eg http://www.cisco.com/en/US/tech/tk86/tk89/technologies_tech_note09186a00... - since this relates to those timing offset ! markers. cable map-advance dynamic would be the usual way to configure an interface these days.

Hope that helps, let us know how you go!

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Thu, 11/08/2012 - 18:24
Capm
That upstream SNR reading

That upstream SNR reading seems low to me. One thing I encountered when I first fired up our CMTS is that the channel I was using was getting its top-edge cut off just slightly out in the field (roll off due to diplexers or eq's.. too close to the band edge)

Try moving the frequency down, and specify a channel width and mode, as well, for each upstream.

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Sun, 11/11/2012 - 07:45
stephend2
We found that there is a bad

We found that there is a bad upstream noise problem in the area where the modems are dropping off, was seeing snr bounce around from 15-28db on that upstream, spectrum analyzer confirmed noise spikes up to about +15 coming in, modems coming back at 0. There was nowhere to move the upstream to, noise was everywhere in the return path. They are going to perform leakage testing tomorrow to hopefully find the problem. We also found a couple places where there was just not enough gain in the return path, customer off a tap hanging off an amp was transmitting at +58, barely hanging on, took test set to tap, was still +55 there, system owner is going to make adjustments there, we tested at his office where the node before that amp is, everything is good over there.

The line cards in the cmts do not support any of the noise avoidance features, mc16 ? I know it's the basic 1x6 card for the 7200 series.

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