CISCO-CABLE-WIDEBAND-MIB

Organization:

Cisco Systems, Inc.

Module:

CISCO-CABLE-WIDEBAND-MIB

Version:

2011-01-05

File:

CISCO-CABLE-WIDEBAND-MIB.yang

Abstract:

This is the MIB module for the support of Channel Bonding Protocol for the Cable Modem Termination System (CMTS). Wideband DOCS...

Contact:

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Description:

This is the MIB module for the support of Channel Bonding
Protocol for the Cable Modem Termination System (CMTS).

Wideband DOCSIS is a method of increasing downstream
bandwidth by simultaneously transmitting DOCSIS data
over multiple RF channels. This DOCSIS data is
organized as a sequence of 188-byte MPEG-TS data packets.

A Wideband CMTS (WCMTS) is a CMTS that also transmits
Wideband MPEG-TS packets.

An Edge QAM (Quadrature Amplitude Modulation) device is one
which provides the QAM and used to couple the Wideband MPEG-TS
packet onto the HFC plant.

A Wideband Cable Modem (WCM) is a CableModem (CM) that
is able to receive Wideband MPEG-TS packets.

A wideband channel or Bonded Group (BG) is a logical
grouping of one or more physical RF channels over which
MPEG-TS packets are carried. Wideband channel carries DOCSIS
bonded packets encapsulated in MPEG-TS packets from a
WCMTS to one or more WCMs.

Packets outgoing from WCMTS to the WCM are formatted with
the DOCSIS Header. The DOCSIS packets are then formatted into
MPEG-TS data packets. These are 188 byte MPEG packets
containing the DOCSIS information.
Within DOCSIS Header of the WB Channel there is an extended
header called, DOCSIS Bonding Extended Header, the format of
which is shown below:

--------------------------------------------------------
| ---------------------------------------------------- |
| | TYPE | LEN | BSID | SEQ |
| ---------------------------------------------------- |
| | byte 0 | byte 1-2 | byte 3-4 |
|--------------------------------------------------------|
DOCSIS Bonding Extended Header

BSID is the Bonding Service IDentifier, it defines a sequence
number for a Wideband channel. It is used by the WCM to
re-sequence packets received over downstream channels to
maintain packet order. SEQ is per service flow sequence number.
Whereas TYPE is the type of the Bonding Extended Header and LEN
specifies its length.

A Narrowband Channel is a standard DOCSIS downstream channel
which contains exactly one RF channel.
The wideband protocol utilizes the existing narrowband
downstream channel for carrying the MAC management and
signaling messages and the associated narrowband upstream
for return data traffic and signaling.

The channel bonding protocol supports multiple wideband
bonded groups. This will allow the WCM to listen to multiple
bonded groups at the same time. This would support (for example)
multicast video being sent to a CPE device on the LAN side of
the WCM in addition to standard DOCSIS data.

Channel Bonding allows two types of Bonding Group (BG) interfaces.
These are Secondary BG interface and non-Secondary BG
interface. The Secondary BG interfaces will carry the multicast
traffic, whereas, the non-Secondary BG interface will carry the
non-multicast traffic.
This MIB also allows for configuration of the RF channels
on the WCMTS, as well as the association between the RF and
narrowband downstream channels with the BG channel.

Fiber Node is an optical node which terminates the fiber based
downstream signal as an electrical signal onto a coaxial RF cable.

DEPI: Downstream external physical interface.
TSID: MPEG2 Transport Stream ID.
SFP: Small Form-Factor Pluggable.