DOCSIS 3.0 and M-CMTS.ppt

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* Actual usable rates minus the DOCSIS Phy and MAC overhead
Maximum throughput can be achieved with 1 Downstream
© 2007 Cisco Systems, Inc. All rights reserved.
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FTP
SMTP
Packets from a cable modem in a DOCSIS 1.0 network all travel through the same SID.
IP ToS can be used to differentiate QoS at the CMTS, but over the DOCSIS network, there is only one hypothetical “pipe”.
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Data
FTP
SMTP
SFID1
SFID2
SFID4
SFID5
Packets from a cable modem in a DOCSIS 1.1 network are CLASSIFIED by the CM and CMTS, and delivered through the corresponding SFID.
If a Packet is not classified, it travels over the default SFID
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Cable5/0/0
64 QAM and 6.4Mhz Channel Width added
DOCSIS 1.1
Default SFID
Data
FTP
SMTP
SFID1
SFID2
SFID4
SFID5
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Data
FTP
SMTP
SFID1
SFID2
SFID4
SFID5
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MC5x20
UBR10012 (Fully Loaded with MC5x20)
40 Downstreams ( 5 x 8 slots)
160 Upstreams ( 20 x 8 slots)
Total of 40 MAC Domains
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DS = Downstream
US = Upstream
WB = Wideband
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Physical Layer Spec (CM-SP-PHYv3.0)
Operations Support System Interface Specification (SP-OSSIv3.0)
Security Specification (SP-SECv3.30)
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Downstream External PHY Interface specification (CM-SP-DEPI)
DOCSIS Timing Interface Specification (CM-SP-DTI)
M-CMTS Operations Support System Interface Specification (SP-M-OSSI)
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Downstream 108-870 MHz
Builds further on DOCSIS 2.0
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uBR10k
5X20
CM 1 Legacy Modem
Test Setup 1 Attributes: M-CMTS Core and EQAM Directly connected CM 1 & CM 2 Legacy Modems CM 3 & CM 4 3 Channel Modems configured to bond to channels as shown Use Sniffer to snoop traffic on RF and Ethernet links. M-CMTS Core and EQAM Verification: Verify that CMs lock on DS and receive DS sync Verify that CMs can detect UCD messages for upstream Verify that CMs can contact the DHCP server through the CMTS during registration Verify that all the CM’s come online Verify MAC Management Messages using Sniffer Verify the timestamp on SYNC messages Check DTI parameters and verify that following parameters are identical at M-CMTS Core and EQAM side: (Timestamp, Clock operating mode, Timing source) Test cases post-registration: Traffic Generator to be setup to send and receive data traffic (UDP and TCP) to/from M-CMTS as shown. Traffic Generator to be setup to send and receive data traffic (UDP and TCP) from/to CM’s. Setup Traffic Generator to send/receive multiple data streams Setup Traffic Generator to send/receive video content In all these test cases check for drops in the packet shelf, EQAM and verify packet counts at traffic source and receiver Variations on Test Setup 2 & 3: Attributes: M-CMTS Core and EQAM to be connected via 2 3750G switches connected in series M-CMTS Core and EQAM to be connected via L3 switches. Scaling test Provision 48 modular downstreams QAMs between Packet shelf and EQAM Make sure legacy CMs can come online on different downstreams Saturate the downstreams with traffic and check for traffic loss and ensure that new CMs can still come online Modify EQAM headroom parameter to control amount of traffic packet shelf can send for a QAM and retest DTI testcases Disconnect active port of TCC card. Verify that port switchover is taking place. Connect one TCC port to free-running DTI server, and another to DTI server with active GPS. Verify that the active port clocking source is GPS.
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Bonding of 2 or more QAM channels into Wideband channel
Uses DOCSIS 3.0 Packet Bonding to encapsulate MPEG-TS to Ethernet for transmission to EQAM
Uses existing Edge QAM (EQAM) devices deployed for VOD services
Future implementations may offer 600 Mps+ downstream
16 x 6 MHz channels @ 256 QAM
The downstream Wideband channel is created by taking DOCSIS frames, putting them into MPEG-TS packets, and placing those MPEG-TS packets onto QAM carriers. However, instead of placing those MPEG-TS packets “horizontally” in time along a single QAM carrier as is done in traditional DOCSIS, the Wideband protocol places those MPEG-TS packets “vertically” across the QAM carriers assigned to a Wideband channel. A DOCSIS frame is literally tipped on its side and striped our across a group of QAM channels.
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uBR10k
L1/L2/L3 CIN
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L1/L2/L3 CIN
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DOCSIS 3.0 DS Channel Bonding over SPA at a Glance
Uses external QAMs connected to SPA (Modena)
Increase legacy downstream port density of ubr10k
Uses M-CMTS compliant Edge-QAM (EQAM) devices
Cisco RFGW-1D and RFGW-10
Uses DTI timing source for DS channels
Enables legacy DOCSIS [1.x/2.0] modems to use external QAMs for operation
Allows MxN mac domains
Allows bonding on all channels in a BG
Address limitation of Ferrari which requires one DS from 5x20, which is not bonding capable
Hits the 100 Mbps BW mark on a 3-channel modem
The downstream Wideband channel is created by taking DOCSIS frames, putting them into MPEG-TS packets, and placing those MPEG-TS packets onto QAM carriers. However, instead of placing those MPEG-TS packets “horizontally” in time along a single QAM carrier as is done in traditional DOCSIS, the Wideband protocol places those MPEG-TS packets “vertically” across the QAM carriers assigned to a Wideband channel. A DOCSIS frame is literally tipped on its side and striped our across a group of QAM channels.
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uBR10012 CMTS
Dual SPA jacket card
WCM300 (Linksys), SA 3CH (BCM 3381 modem), DPC3000
M-CMTS compliant EQAM (Cisco RFGW-x / Harmonic NSG9000)
DTI card (Eightbells) for uBR10K
DTI Server
While the WB jacket card is similar to a SIP, the processors on the card are not in the data path and are more of a control system for the SPAs
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Primary Channel (PC)
The "primary downstream channel" of a CM is defined as the downstream channel from which it derives CMTS master clock timing for upstream transmission.
DS channel used by a legacy or DOCSIS 3.0 Cable modem to register with the CMTS.
Used to transmit all MMM (MAC Management Messages) to/from Cable Modems.
DS from MC520 Linecard or DS from the EQAM
Secondary Channel
All DS Channel that do not have characteristics of a PC.
DS Channel used to transmit “Data packets” from the CMTS to the CM.
While the WB jacket card is similar to a SIP, the processors on the card are not in the data path and are more of a control system for the SPAs
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CM
CM
CM
CM
MC5x20U
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HW linecard configuration that will be supported includes:
One “Saratoga” SIP carrier card with 2 “Modena” SPAs occupying slots 1 and 2
Supported uBR10K WAN cards such as half-height or full height GE cards in slots 3 and 4
Up to 8, 5x20 cards (any type of 5x20 linecards) in RF slots (possibly in 7+1 HCCP configuration)
One or 2 “Eightbells” utility cards
If 2 Eightbells are inserted they will be in 1+1 redundancy config
Note that the Shipsbell utility card will be supported in this image (12.3(23)BC), but for proper functioning of primary functionality on the modular SPA downstreams the operator will be required to use Eightbells and connect it to an external DTI server. We will not support a configuration where Eightbells and Shipsbell co-exist in the uBR10k chassis.
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Cisco Wideband SIP
Takes 2 slots.
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Cisco 10000 SIP-600
Takes 2 slots.
Supports 1 WAN-SPA
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EQAM
X
X
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SYNC, UCD, MAP messages
WCM performs usual US channel selection, but does not start initial ranging
MDD message
WCM performs bonded service group selection, and indicates via initial ranging
B-INIT-RNG-REQ message
DHCP DISCOVER packet
REG-ACK message
REG-RSP message
TOD Request/Response messages
TFTP Request/Response messages
WCM provides Rx-Chan(s)-Prof
WCM receives Rx-Chan(s)-Config
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MAC Domain Descriptor (MDD)
Information is conveyed to bonding capable modems by MDD (MAC Domain Descriptor)
MDD is transmitted every 2 seconds
MDD is transmitted on all bundled PC channels associated with the WB channel in the cable fiber-node table
Modem must re-register if 3 consecutive MDD are missed
In 12.3(21)BC (Dali), primary MDD messages are sent on the local 5x20 DS as it is the only Primary capable DS channel in the MD. Secondary MDD messages are sent on the remote channels
12.3(23)BC (Rembrandt) introduces a method to add Primary capable DS channels to MD and Primary MDDs must be sent on them.
When a remote channel is added to a MD and the corresponding MC interface line protocol is UP, a Primary MDD message is sent on the remote DS. Secondary MDD’s are sent on the non-primary capable channels.
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DOCSIS 3.0 MDD (MAC Domain Descriptor)
Nov 1 21:02:08 MET: Cable5/0/1 MDD datagramsize 127, msg len 125, ehdr type_or_len 107, tlv_size 97 max_pak_size 1518
Nov 1 21:02:08 MET: MDD MESSAGE
Nov 1 21:02:08 MET: FRAME HEADER
Nov 1 21:02:08 MET: FC - 0xC2 ==
Nov 1 21:02:08 MET: MAC_PARM - 0x00
Nov 1 21:02:08 MET: LEN - 0x7D
Nov 1 21:02:08 MET: MAC MANAGEMENT MESSAGE HEADER
Nov 1 21:02:08 MET: DA - 01E0.2F00.0001
Nov 1 21:02:08 MET: SA - 0005.00E4.998F
Nov 1 21:02:08 MET: msg LEN - 6B
Nov 1 21:02:08 MET: DSAP - 0
Nov 1 21:02:08 MET: SSAP - 0
Nov 1 21:02:08 MET: control - 03
Nov 1 21:02:08 MET: version - 04
Nov 1 21:02:08 MET: type - 21
Nov 1 21:02:08 MET: dcid - 26 ==
Nov 1 21:02:08 MET: MDD TLV, Total TLV size - 97
Nov 1 21:02:08 MET: MDD TLV
Nov 1 21:02:08 MET: Downstream Active Channel List
Nov 1 21:02:08 MET: Channel ID: 24
Nov 1 21:02:08 MET: Frequency: 453000000Hz
Nov 1 21:02:08 MET: Modulation Order/Annex: 64 QAM/Annex A
Nov 1 21:02:08 MET: Primary Capable: Not Primary-Capable
Nov 1 21:02:08 MET: Primary Capable: Not Primary-Capable
Nov 1 21:02:08 MET: Primary Capable: Primary-Capable
Nov 1 21:02:08 MET: Primary Capable: Primary-Capable
Nov 1 21:02:08 MET: MAC Domain Downstream Service Group
Nov 1 21:02:08 MET: MD-DS-SG ID: 2
Nov 1 21:02:08 MET: Channel IDs: 24
Nov 1 21:02:08 MET: 25
Nov 1 21:02:08 MET: 26
Nov 1 21:02:08 MET: 27
Nov 1 21:02:08 MET: Downstream Ambiguity Resolution Frequency List
Nov 1 21:02:08 MET: Frequencies: 453000000Hz
Nov 1 21:02:08 MET: 461000000Hz
Nov 1 21:02:08 MET: 469000000Hz
Nov 1 21:02:08 MET: 477000000Hz
Nov 1 21:02:08 MET: MDD packet dump:
Nov 1 21:02:08 MET: 0x0000: C2 00 00 7D 00 00 01 E0 2F 00 00 01 00 05 00 E4
Nov 1 21:02:08 MET: 0x0010: 99 8F 00 6B 00 00 03 04 21 00 01 01 01 1A 01 0F
Nov 1 21:02:08 MET: 0x0020: 01 01 18 02 04 1B 00 3B 40 03 01 00 04 01 00 01
Nov 1 21:02:08 MET: 0x0030: 0F 01 01 19 02 04 1B 7A 4D 40 03 01 00 04 01 00
Nov 1 21:02:08 MET: 0x0040: 01 0F 01 01 1A 02 04 1B F4 5F 40 03 01 00 04 01
Nov 1 21:02:08 MET: 0x0050: 01 01 0F 01 01 1B 02 04 1C 6E 71 40 03 01 00 04
Nov 1 21:02:08 MET: 0x0060: 01 01 02 09 01 01 02 02 04 18 19 1A 1B 03 10 1B
Nov 1 21:02:08 MET: 0x0070: 00 3B 40 1B 7A 4D 40 1B F4 5F 40 1C 6E 71 40
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Hardware Verification
Software Verification
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Interface Wideband-Cable 1/0/0:0
Modular-Cable 1/0/0
FN2
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card 1/0 2jacket-1 ----- SIP Card – Slot 1/0
card 1/0/0 24rfchannel-spa-1 ----- SPA in Slot 1/0/0
card 1/1 2cable-dtcc ----- DTI Timing Card
Note the DTCC linecard is not “required” if primary channels are not configured in the EQAM.
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MC520
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Ensure you are running 12.3(23)BC or later if you want to do DOCSIS 3.0 DS channel bonding.
ubr10K#show show version
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Modular Cable Controller Configuration
rf-channel 0 frequency 699000000 annex B modulation 256qam interleave 32
rf-channel 0 ip-address 1.3.4.2 mac-address 0090.f001.0b5f depi-remote-id 37008
rf-channel 0 network-delay 750 <= Default 550usec
rf-channel 1 cable downstream channel-id 49
rf-channel 1 network-delay 750
rf-channel 2 ip-address 1.3.4.2 mac-address 0090.f001.0b5f udp-port 37010
………
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Fiber-Node Configuration
(cable fiber-node)# [no] downstream cable <slot>>/<subslot>/<unit>
(cable fiber-node)# [no] downstream modular-cable <slot>/<subslot>/<unit> rf-channel <low-high> | <n>
<fiber-node-id> A numerical ID for the Fiber-Node
<description> Description of this Fiber-Node (optional)
<low–high> Physical ports on Blaze
Range 0-23 or 0-17 based on annex/modulation
Represents some of the 24 RF channels/ports on a Blaze SPA
<n> A physical port on Blaze.
Range 0-23 or 0-17 based on annex/modulation
Represents one of the 24 RF channels/ports on a Blaze SPA
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(cable fiber-node)# downstream modular-cable 1/0/0 rf-channel 0-3
Fiber Node – Describes the plant topology, the set of US and DS channels that can be seen by a group of modems.
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Wideband Interface Configuration
interface Wideband-Cable1/0/0:0
cable rf-channel 0
cable rf-channel 1
cable rf-channel 2
cable rf-channel 3
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Cisco/DOCSIS 3.0 Terms
Fiber Node – Describes the plant topology, the set of US and DS channels that can be seen by a group of modems.
Controller Modular-Cable – The Modular-Cable controller represents a Modena SPA and an instance of this controller is created for each SPA in a Jacket card. EQAM connectivity information and physical parameters such as QAM frequency, modulation type etc. are configured under the controller. We will continue to use the WB Stradale CLI to enter the DS channel id here.
Interface Modular-Cable – An instance of the Modular-Cable interface is exposed to the user when the corresponding RF channel of the SPA is designated as a primary capable (NB) downstream channel. Layer 3 features such as cable bundle, cable ARP, DSG, static multicast, etc. are configured under this interface.
Interface Wideband-Cable –interface to represent a Bonding Group. The SPA RF channels that make up this Bonding Group are configured under this interface
Max of 24 because 48 max supported channels for 2 SPAs and at least 2 channels per bonding group.
Downstream Modular-Cable command – Used under cable interface to specify primary capability of QAM chs as well as association of US channels to DS QAMs.
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MC5x20 channels
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Identifies a single 5x20 downstream
Identifies 4 upstreams
uBR10k supports up to 40 MAC Domains
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Additional Modena DS Channels
SPA DS channels
FN2
FN3
FN4
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Defines a MAC Domain
Identifies 4 upstreams
uBR10k supports up to 40 MAC Domains
Defines unique number space for SID, SAID, LC SFID etc
Encapsulates a Channel Grouping Domain (CGD)
Can add more downstreams from Modena
Allows flexible DS/US association
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Flexible DS/US Association
SPA DS channels
FN2
FN3
FN4
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Bundle membership is inherited from the hosting MAC Domain
Identifies the narrowband capability of a Modena downstream
Primary capable channel in D3.0
Static QAM bandwidth sharing model with overlapping bonding groups for FCS
Makes “mixed” NB/WB environment less attractive
One MC interface created for each QAM in the SPA
Conditions for interface and protocol to be “up/up” are:
QAM channel is designated as a PC by the CGD
Frequency and EQAM IP address are configured
The RF channel is configured to use DEPI encapsulation
Bandwidth is configured on the MC interface
Modular-Host is configured on the SPA controller
GE port on SPA has link and is protocol ‘up’
MC interface is not admin down
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<a> Jacket card slot number
<b> Jacket card subslot number
<c> SPA bay number
<i> first rf-channel index in the range of DS channels specified
<j> last rf-channel index in the range of DS channels specified
<k..l> list of upstreams associated with these DS channel
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<k..l> list of upstreams associated with the 5x20 DS
Only MAP and UCD MAC MMMs for these US will be sent on the local 5x20 Downstream.
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Mac Domain = CGD
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Modular-cable controller
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card 1/0 2jacket-1 ----- SIP Card – Slot 1/0
card 1/1 2cable-dtcc ----- DTI Timing Card
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Ensure you are running 12.3(23)BC or later if you want to do DOCSIS 3.0 DS channel bonding.
ubr10K#show version
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rf-channel 0 network-delay 750 <= Default 550usec
rf-channel 1 cable downstream channel-id 49
rf-channel 1 network-delay 750
rf-channel 2 ip-address 1.3.4.2 mac-address 0090.f001.0b5f udp-port 37010
………
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Not required due each Downstream in the EQAM has a unique and bidirectional association with the “Modular-Cable” interfaces
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cable bundle 1
interface Cable 5/0/1
cable Interface
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interface Wideband-Cable1/0/0:0
cable fiber-node 2
Wideband Interface Configuration (Optional)
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Scenario 1 - WCMs on 1 WB Ch use Same PC
Fiber
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Scenario 2 - WCMs of 1 WB Ch use different PC
Fiber
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Scenario 3 - WCMs of different WB BG use Same PC
Fiber
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Scenario 4 - WCMs of different WB Chs use different PC
RF Channel 1
RF Channel 3
RF Channel 4
RF Channel x
RF Channel 2

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DOCSIS 3.0 and M-CMTS.ppt