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This feature module describes the MC16E 8MHz cable modem card for Cisco uBR7200 series universal broadband routers.
The MC16E card is designed to operate on cable plants where 8MHz channel widths are used. It uses the entire 8MHz channel for data communications and provides a high level of bandwidth connectivity.
Cisco IOS releases from 12.0(7)T, 12.0(7)XR2, 12.1 mainline, 12.1(1)T and higher, and SC trains 12.0(8)SC, 12.0(9)SC and higher support the Cisco uBR-MC16E on the uBR7223, uBR7246, and uBR7246 chassis.
This feature module includes the following sections:
The Cisco uBR7200 series universal broadband routers support downstream and upstream traffic to and from Data Over Cable Service Interface Specification (DOCSIS)-based cable modems (CMs) and set-top box (STB) units with integrated EuroDOCSIS modems.
The Cisco MC16E cable modem card contains one downstream modulator and six upstream demodulators for connection to the cable network. The card supports the following defaults: 256 QAM at 40 Mbps downstream and 16 QAM at 5 Mbps upstream. It supports EuroDOCSIS 8MHz Phase Alternating Line (PAL) and Systeme Electronique Couleur Avec Memoire (SECAM) channel plans, supporting downstream rates of 85 to 860MHz range and upstream ranges of 5 to 65MHz. The card outputs +40dBmV and +/-2dB.
The MC16E supports full 8MHz operation. The card has a differing symbol rate (6.952Msym/sec). It transmits downstream IF signals to an upconverter at a frequency of 36.125MHz.
The MC16E card uses the ITU J.83 Annex A physical layer and EuroDOCSIS (Annex A) standard---CableLabs ECR, RFI-R-98036. It should not be used in production cable plants that support a 6MHz channel plan.
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Note The difference between DOCSIS and EuroDOCSIS is at the physical layer. Supporting EuroDOCSIS requires the Cisco MC16E cable modem card, appropriate upconverters that support an 8MHz PAL or SECAM channel plan, appropriate diplex filters, and EuroDOCSIS-based CMs or STBs containing integrated EuroDOCSIS CMs. |
Figure 1 illustrates the Cisco cable network architecture.
The cable headend brings national and regional content, including satellite and off-the-air video, the Internet backbone, and dial access to the cable network. The headend reformats this content to be sent to hubs over the high-speed optical fiber network.
The hub combines regional programming with local content, and sends the combined content to the hybrid fiber coaxial (HFC) cable network.
The HFC network distributes this content to subscriber devices, including cable modems and STBs. Interfaces on a digital STB allow connection to a television and one or more personal computers using an ethernet connection. The regional data center is often located at the headend or connected to the headend with a high-speed fiber network. It contains STB and cable modem provisioning serves (such as the Cisco Subscriber Registration System [CSRC]), STB Internet application servers that bring Internet services to the television, and billing proxy servers.
The MC16E cable modem card:
For additional information on the Cisco uBR7200 series and cable modem cards, see:
The MC16E cable modem card is supported in the platforms:
Standards
The MC16E card supports the ITU J.83 Annex A physical layer and EuroDOCSIS (Annex A) standard---CableLabs ECR, RFI-R-98036.
MIBs
For descriptions of supported MIBs and how to use MIBs, see the Cisco MIB web site on CCO at http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml.
RFCs
No new or modified RFCs are supported by this feature.
Before you configure the Cisco uBR7200 series universal broadband router with the MC16E card:
See the following sections for configuration tasks for the MC16E cable modem card.
Router(config)#exit
Router#
%SYS-5-CONFIG_I: Configured from console by console. (normal message and doesn't indicate an error)
| Command | Purpose | |
|---|---|---|
Step 1 | Router# configure terminal | Enter configuration mode. |
Step 2 | Router (config)# interface type slot/port | Configure the interface where: |
Step 3 | Router (config-int) # cable downstream frequency down-freq-hz | Enter the fixed center frequency for your downstream RF carrier in Hz. The downstream frequency command is an information-only command. Currently it has no effect on external upconverters. The downstream frequency command reflects the digital carrier frequency, which is the center frequency of the downstream RF carrier (the channel) for that downstream port. The downstream frequency is set on the upconverter connected to the downstream port. The digital carrier frequency is specified to be the center of an 8MHz channel. The digital carrier frequency is not the same as the video carrier frequency. |
Step 4 | Router (config-int) # no shutdown | Activate a downstream port on a cable modem card for digital data transmissions over the HFC network. |
Step 5 | Router (config-int) # cable upstream port frequency up-freq-hz | Enter the fixed center frequency for the upstream RF carrier (in Hz) and port number from 0 to 5. You must set the upstream frequency of the RF output to comply with the expected input frequency of the Cisco MC16E cable modem card. To set the upstream frequency, enter a fixed frequency of the upstream RF carrier for an upstream port. The valid range for a fixed upstream frequency is 5,000,000 Hz to 65,000,000 Hz. Ensure that the upstream frequency selected does not interfere with the frequencies used for any other upstream applications running in the cable plant. The cable interface does not operate until you either set a fixed upstream frequency or create and configure a spectrum group. Repeat this command for each port used. |
Step 6 | Router (config-int) # no cable upstream port shutdown | Activate the RF carrier on the upstream ports. Each upstream port must be activated to enable upstream data from the cable modems or set-top boxes on your network to the Cisco uBR7200 series router. Repeat this command for each port used. |
Step 7 | Router (config-int) # exit | Enter exit to go back to the configuration mode. |
To check the value of the settings you have entered, enter the show running-config command:
Router# show running-configCurrent configuration: ! version 12.0 service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname R7732-06-uBR7246-CE ! ! cable modulation-profile 1 request 0 16 1 8 16qam scrambler 152 no-diff 128 fixed uw16 cable modulation-profile 1 initial 5 34 0 48 16qam scrambler 152 no-diff 256 fixed uw16 cable modulation-profile 1 station 5 34 0 48 16qam scrambler 152 no-diff 256 fixed uw16 cable modulation-profile 1 short 6 75 6 8 16qam scrambler 152 no-diff 144 fixeduw8 cable modulation-profile 1 long 8 220 0 8 16qam scrambler 152 no-diff 160 fixeduw8 cable modulation-profile 2 request 0 16 1 8 qpsk scrambler 152 no-diff 64 fixeduw8 cable modulation-profile 2 initial 5 34 0 48 qpsk scrambler 152 no-diff 128 fixed uw16 cable modulation-profile 2 station 5 34 0 48 qpsk scrambler 152 no-diff 128 fixed uw16 cable modulation-profile 2 short 5 75 6 8 qpsk scrambler 152 no-diff 72 fixed uw8 cable modulation-profile 2 long 8 220 0 8 qpsk scrambler 152 no-diff 80 fixed uw8 ! no cable qos permission create no cable qos permission update cable qos permission modems ! ! ! ! ip subnet-zero ip host abrick 223.255.254.254 ! ! ! interface Loopback0 ip address 222.2.4.1 255.255.255.255 no ip directed-broadcast ! interface Loopback1 ip address 111.0.4.1 255.255.255.255 no ip directed-broadcast ! interface Loopback2 ip address 111.0.4.2 255.255.255.255 no ip directed-broadcast ! interface FastEthernet0/0 ip address 1.8.93.9 255.255.0.0 no ip directed-broadcast ! interface Cable3/0 ip address 3.214.1.1 255.255.255.0 no ip directed-broadcast load-interval 30 no keepalive cable helper-address 1.8.93.100 cable downstream annex A cable downstream modulation 64qam cable downstream frequency 669000000 cable upstream 0 frequency 5008000 cable upstream 0 power-level 0 no cable upstream 0 shutdown cable upstream 1 frequency 10000000 cable upstream 1 power-level 0 no cable upstream 1 shutdown cable upstream 2 frequency 15008000 cable upstream 2 power-level 0 no cable upstream 2 shutdown cable upstream 3 frequency 20000000 cable upstream 3 power-level 0 no cable upstream 3 shutdown cable upstream 4 frequency 55008000 cable upstream 4 power-level 0 no cable upstream 4 shutdown cable upstream 5 frequency 60000000 cable upstream 5 power-level 0 no cable upstream 5 shutdown ! ip default-gateway 1.8.0.1 ip classless ip route 223.255.254.254 255.255.255.255 1.8.0.1 ! snmp-server engineID local 00000009020000D0BA1EED00 snmp-server community public RO snmp-server community private RW ! alias exec scm show cable modem ! line con 0 exec-timeout 0 0 transport input none line aux 0 line vty 0 4 password lab login ! end
To verify the current value of the upstream frequency, enter the show controllers cable slot/port upstream command for the upstream port that you just configured:
Router# show controllers cable 3/0 upstream Cable3/0 Upstream 0 is up Frequency 5.008MHz, Channel Width 1.600MHz, 16-QAM Symbol Rate 1.280 Msps Spectrum Group is overridden SNR 31.1260 dB Nominal Input Power Level 0 dBmV, Tx Timing Offset 5661 Ranging Backoff Start 0, Ranging Backoff End 4 Ranging Insertion Interval automatic (50 ms) Tx Backoff Start 0, Tx Backoff End 4 Modulation Profile Group 1 part_id=0x3137, rev_id=0x03, rev2_id=0xFF nb_agc_thr=0x0000, nb_agc_nom=0x0000 Range Load Reg Size=0x2C Request Load Reg Size=0x07 Minislot Size in number of Timebase Ticks is = 8 Minislot Size in Symbols =64 Bandwidth Requests = 0x81 Piggyback Requests = 0x1B Invalid BW Requests= 0x0 Minislots Requested= 0x36B Minislots Granted = 0x36B Minislot Size in Bytes = 32 Map Advance = 4000 usecs UCD Count = 86298 DES Ctrl Reg#0 = C000C043, Reg#1 = 0 Cable3/0 Upstream 1 is up Frequency 10.000MHz, Channel Width 1.600MHz, 16-QAM Symbol Rate 1.280 Msps Spectrum Group is overridden SNR - Unknown Nominal Input Power Level 0 dBmV, Tx Timing Offset 0 Ranging Backoff Start 0, Ranging Backoff End 4 Ranging Insertion Interval automatic (50 ms) Tx Backoff Start 0, Tx Backoff End 4 Modulation Profile Group 1 part_id=0x3137, rev_id=0x03, rev2_id=0xFF nb_agc_thr=0x0000, nb_agc_nom=0x0000 Range Load Reg Size=0x2C Request Load Reg Size=0x07 Minislot Size in number of Timebase Ticks is = 8 Minislot Size in Symbols =64 Bandwidth Requests = 0x0 Piggyback Requests = 0x0 Invalid BW Requests= 0x0 Minislots Requested= 0x0 Minislots Granted = 0x0 Minislot Size in Bytes = 32 Map Advance = 4000 usecs UCD Count = 86232 DES Ctrl Reg#0 = C000C043, Reg#1 = 0 Cable3/0 Upstream 2 is up Frequency 14.992MHz, Channel Width 1.600MHz, 16-QAM Symbol Rate 1.280 Msps Spectrum Group is overridden SNR - Unknown Nominal Input Power Level 0 dBmV, Tx Timing Offset 0 Ranging Backoff Start 0, Ranging Backoff End 4 Ranging Insertion Interval automatic (50 ms) Tx Backoff Start 0, Tx Backoff End 4 Modulation Profile Group 1 part_id=0x3137, rev_id=0x03, rev2_id=0xFF nb_agc_thr=0x0000, nb_agc_nom=0x0000 Range Load Reg Size=0x2C Request Load Reg Size=0x07 Minislot Size in number of Timebase Ticks is = 8 Minislot Size in Symbols =64 Bandwidth Requests = 0x0 Piggyback Requests = 0x0 Invalid BW Requests= 0x0 Minislots Requested= 0x0 Minislots Granted = 0x0 Minislot Size in Bytes = 32 Map Advance = 4000 usecs UCD Count = 86221 DES Ctrl Reg#0 = C000C043, Reg#1 = 0 Cable3/0 Upstream 3 is up Frequency 19.984MHz, Channel Width 1.600MHz, 16-QAM Symbol Rate 1.280 Msps Spectrum Group is overridden SNR - Unknown Nominal Input Power Level 0 dBmV, Tx Timing Offset 0 Ranging Backoff Start 0, Ranging Backoff End 4 Ranging Insertion Interval automatic (50 ms) Tx Backoff Start 0, Tx Backoff End 4 Modulation Profile Group 1 part_id=0x3137, rev_id=0x03, rev2_id=0xFF nb_agc_thr=0x0000, nb_agc_nom=0x0000 Range Load Reg Size=0x2C Request Load Reg Size=0x07 Minislot Size in number of Timebase Ticks is = 8 Minislot Size in Symbols =64 Bandwidth Requests = 0x0 Piggyback Requests = 0x0 Invalid BW Requests= 0x0 Minislots Requested= 0x0 Minislots Granted = 0x0 Minislot Size in Bytes = 32 Map Advance = 4000 usecs UCD Count = 86219 DES Ctrl Reg#0 = C000C043, Reg#1 = 0 Cable3/0 Upstream 4 is up Frequency 54.992MHz, Channel Width 1.600MHz, 16-QAM Symbol Rate 1.280 Msps Spectrum Group is overridden SNR - Unknown Nominal Input Power Level 0 dBmV, Tx Timing Offset 0 Ranging Backoff Start 0, Ranging Backoff End 4 Ranging Insertion Interval automatic (50 ms) Tx Backoff Start 0, Tx Backoff End 4 Modulation Profile Group 1 part_id=0x3137, rev_id=0x03, rev2_id=0xFF nb_agc_thr=0x0000, nb_agc_nom=0x0000 Range Load Reg Size=0x2C Request Load Reg Size=0x07 Minislot Size in number of Timebase Ticks is = 8 Minislot Size in Symbols =64 Bandwidth Requests = 0x0 Piggyback Requests = 0x0 Invalid BW Requests= 0x0 Minislots Requested= 0x0 Minislots Granted = 0x0 Minislot Size in Bytes = 32 Map Advance = 4000 usecs UCD Count = 86212 DES Ctrl Reg#0 = C000C043, Reg#1 = 0 Cable3/0 Upstream 5 is up Frequency 59.984MHz, Channel Width 1.600MHz, 16-QAM Symbol Rate 1.280 Msps Spectrum Group is overridden SNR - Unknown Nominal Input Power Level 0 dBmV, Tx Timing Offset 0 Ranging Backoff Start 0, Ranging Backoff End 4 Ranging Insertion Interval automatic (50 ms) Tx Backoff Start 0, Tx Backoff End 4 Modulation Profile Group 1 part_id=0x3137, rev_id=0x03, rev2_id=0xFF nb_agc_thr=0x0000, nb_agc_nom=0x0000 Range Load Reg Size=0x2C Request Load Reg Size=0x07 Minislot Size in number of Timebase Ticks is = 8 Minislot Size in Symbols =64 Bandwidth Requests = 0x0 Piggyback Requests = 0x0 Invalid BW Requests= 0x0 Minislots Requested= 0x0 Minislots Granted = 0x0 Minislot Size in Bytes = 32 Map Advance = 4000 usecs UCD Count = 86211 DES Ctrl Reg#0 = C000C043, Reg#1 = 0
To verify the current value of the center frequency enter the show controllers cable slot/port downstream command for the downstream port that you just configured:
Router# show controllers cable 3/0 downstream Cable3/0 Downstream is up Frequency 669.0000MHz, Channel Width 8MHz, 64-QAM, Symbol Rate 6.952000 Msps FEC ITU-T J.83 Annex A, R/S Interleave I=12, J=17 Downstream channel ID: 0
To monitor and maintain the MC16E cable modem card, use the show cable modem command. This command displays information on all cable modems or set-top boxes (or a particular modem on the network).
Router# show cable modem
The show cable modem command now includes all the DOCSIS states, as well as other useful troubleshooting information, including last received upstream RF power level and maximum number of provisioned customer premises equipment.
DOCSIS cable modems are required to pass through successive states during registration and provisioning. Using this information, cable system administrators can isolate why a cable modem is offline or unavailable.
The Online State column contains:
offline---Cable modem considered offline
init (r1)---Cable modem sent initial ranging
init (r2)---Cable modem is ranging
init (rc)---Cable modem ranging complete
init (d)---DHCP request received
init (i)---DHCP reply received; IP address assigned
init(o)---Option file transfer started
init (t)---TOD exchange started
online---Cable modem registered, enabled for data
online(d)---Cable modem registered, but network access for the cable modem is disabled
online(pk)---Cable modem registered, BPI enabled and KEK assigned
online(pt)---Cable modem registered, BPI enabled and TEK assigned
offline---Cable modem considered offline
reject (m)---Cable modem did attempt to register; registration was refused due to bad MIC
reject (c)---Cable modem did attempt to register; registration was refused due to bad COS
reject (pk)---KEK modem key assignment rejected
reject (pt)---TEK modem key assignment rejected
The following is an output of the show cable modem command.
R7732-06-uBR7246-CE#show cable modem Interface Prim Online Timing Rec QoS CPE IP address MAC address Sid State Offset Power Cable3/0/U0 1 online 5661 0.50 3 0 3.214.1.13 0030.8047.b3f7 Cable3/0/U0 2 online 5661 0.75 3 0 3.214.1.11 0030.8047.b3d3 Cable3/0/U0 3 online 5661 0.50 3 0 3.214.1.10 0030.8047.b411 Cable3/0/U0 4 online 5661 0.50 3 0 3.214.1.12 0030.8047.b3df
This section documents the modified commands. All other commands used with this feature are documented in the Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide.
Syntax Description
down-freq-hz The known center frequency of the downstream carrier in Hz. The valid range is 85,000,000 to 860,000,000 Hz.
Defaults
Disabled
Command Modes
Cable interface configuration
Command History
12.0 Mainline This command is supported in Cisco IOS 12.0 Mainline release. 12.07T This command was modified. 12.08(SC) This command was modified.
Release
Modification
Usage Guidelines
The downstream frequency of your RF output must be set to match the expected input frequency of your upconverter. To do this, enter the fixed center frequency of the downstream channel for the downstream port. (You can also select a default that does not set a specific fixed value.) The valid range for a fixed center frequency is 85,000,000 to 860,000,000 Hz. The center frequency is also used to configure an IF-to-RF upconverter that must be installed in your downstream path.
The digital carrier frequency is specified to be the center of an 8.0MHz channel. For example, EIA channel 95 spans 90.000 to 96.000MHz. The center frequency is 93.000MHz, which is the digital carrier frequency that should be configured as the downstream frequency. The typical range for current CATV headends is 88,000,000 to 860,000,000 Hz.
Examples
The following example sets the downstream center frequency:
interface cable 6/0 cable downstream frequency 96000000
Syntax Description
This command has no arguments or keywords.
Defaults
Downstream carrier enabled
Command Modes
Cable interface configuration
Command History
12.1(1)T This command is supported. 12.0 This command was supported. 11.3NA This command was supported.
Release
Modification
Examples
The following example enables the downstream port 0 on the cable modem card installed in slot 6 of a Cisco uBR7200 series:
interface cable 6/0 cable downstream if-output
Syntax Description
usport Specifies the upstream port number. Valid range is from 0 to 5. up-freq-hz The upstream center frequency is configured to a fixed value. The valid range is from 5,000,000 to 65,000,000 Hz.
Defaults
Upstream center frequency is not configured to a fixed value.
Command Modes
Cable interface configuration
Command History
12.0(7)T This command was modified. 12.0(8)SC This command was modified. 12.0(7)XR2 This command was modified. 11.3 XA This command was supported.
Release
Modification
Usage Guidelines
The upstream channel frequency of your RF output must be set to comply with the expected input frequency of your Cisco cable modem card. To configure an upstream channel frequency, do one of the following:
Examples
The following example configures the upstream center frequency for port 0 (located in slot 6) to 5700000 Hz:
interface cable 6/0 cable upstream 0 frequency 5700000
Posted: Mon Apr 3 09:18:18 PDT 2000
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