HFC典型设备与配置

//指定快速以太网F0／O接口的IP地址和子网掩码 ip address 10．128．2．1 255．255．255．0 //启用快速以太网接口F0／O no shutdown

//进人Cable接口Cable1／0接口配置模式命令 interface Cablel／0

//指定接口Cablel／O的主IP地址和子网掩码 ip address 10．128．1．1 255．255．255．0 //指定接口Cablel／O的辅助IP地址和子网掩码

ip address 10．254．1．1 255．255．255．0 seeondary //指定MPEG帧格式为北美标准的annex B cable downstream annex B //指定下行信号的调制方式为64qam cable downstream modulation 64qam //指定下行通道的交织深度值为32 cable downstream interleave．depth 32 //指定下行通道中心频率为851MHz cable downstream frequeney 851000000 //设定下行RF输出的功率为55dBmV cable downstream rf-power 55 //开启CMTS集成上变器的射频输出功能 no cable downstream rf-shutdown //启用Cable接口 no shutdown

//设置上行通道的频率为37008000Hz cable upstream 0 frequeney 37008000 //设置输人上行信号的射频载波功率为0dBmV cable upstream 0 power-level 0 //启用上行通道接口

no cab le upstream 0 shutdown

//指示DHCP服务器将与Cablel/0接口主网络号相同的地址分配给CM，与Cablel/0接口第二个网络号相同的地址分配给与CM相连的用户端设备

cable dhcp—giaddr policy ip classless

//设置缺省路由，不在路由表中的数据包都通过快速以太网口FO/0转发 ip route 0．0．0．0 0．0．0．0 FastEthernet0/0

end

四.常用的调试命令

（一）查看CABLE MODEM状态：

test#show cable modem

（二）MODEM状态信息汇总：

test# show cable modem summary total

（三）查看MODEM Flap值（查看MODEM稳定性）： test#show cable modem flap | in

（四）查看信噪比

test#show controllers cable 3/0 | SNR

US phy SNR_estimate for good packets - 33.1583 dB

US phy SNR_estimate for good packets - 32.3468 dB

US phy SNR_estimate for good packets - 30.276 dB

US phy SNR_estimate for good packets - 32.6283 dB （五）Ping测试：Ping默认网关 test#ping

Protocol [ip]: ip

Target IP address: 10.15.1.1 Repeat count [5]: 500 Datagram size [100]: Timeout in seconds [2]: Extended commands [n]: Sweep range of sizes [n]: Type escape sequence to abort.

Sending 500, 100-byte ICMP Echos to 10.15.1.1, timeout is 2 seconds:

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!

Success rate is 100 percent (500/500), round-trip min/avg/max = 1/1/4 ms

（六）查看指定MODEM状态

MAC State

C3/0/U0 online

Prim RxPwr

Num BPI CPE Enb 0 N

test#show cable modem 0014.e8a8. 73d2

MAC Address IP Address 0014.e8a8.73d2 10.27.1.140

（七）定制QoS后查看

I/F

Timin g Offse

Sid (dB) t 127 6.00 1675

（八）查看MODEM详细状态

test#show cable modem 0014.e8a8.4c68 ver

MAC Address IP Address Prim Sid

QoS Profile Index Interface sysDescr

: 0014.e8a8.4c68 : 10.27.3.44 : 52 : 150

: C3/0/U0

: <

BOOTR: 2164; SW_REV: SB5101E-2.4.1.6-SCM02-NOSH; MODEL: SB5101E>> Upstream Power Downstream Power Timing Offset Initial Timing Offset Received Power MAC Version

QoS Provisioned Mode Enable DOCSIS2.0 Mode Phy Operating Mode Capabilities Sid/Said Limit

Optional Filtering Support

: 31.07 dBmV (SNR = 33.22 dB) : -1.09 dBmV (SNR = 23.02 dB) : 1833 : 1833 :

6.00 dBmV

: DOC2.0 : DOC1.0 : Y : atdma

: {Frag=N, Concat=Y, PHS=N, Priv=BPI} : {Max US Sids=0, Max DS Saids=0} : {802.1P=N, 802.1Q=N}