Installation guide

7
Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.1 T
78-10643-04 Rev. B0
System Requirements
System Interoperability
This section clarifies the operation of certain features in the Cisco uBR7200 Series Universal
Broadband Routers:
• DOCSIS 1.0 Baseline Privacy
DOCSIS Baseline Privacy Interface (BPI) gives subscribers data privacy across the RF network,
encrypting traffic flows between the CMTS and CM. BPI ensures that a CM, uniquely identified by
its Media Access Control (MAC) address, can obtain keying material for services only it is
authorized to access.
To enable BPI, choose software at both the CMTS and CM that support the mode of operation. For
the Cisco uBR7200 series software, choose an image with “k1” in its file name or BPI in the feature
set description.
The CM must also support BPI. CMs must have factory-installed RSA private/public key pairs to
support internal algorithms to generate key pairs prior to first BPI establishment. BPI must be
enabled via the DOCSIS configuration file.
Note RSA stands for Rivest, Shamir, and Adelman, inventors of a public-key
cryptographic system.
• CM Interoperability
The Cisco uBR7200 series interoperates with the following cable modems:
– DOCSIS-based two-way CMs that support basic Internet access, VoIP, or VPN.
– Telco-return CMs—To support telco return, use a Cisco uBR7200 series software image that
contains “t” in its file name. The telco-return CM must be DOCSIS-based or compliant, and
must be configured to support telco return.
Note Some third-party telco-return CMs cannot receive traffic over the same
downstream channel as CMs operating on a two-way data system. In these
instances, segment your cable plant to allow more than one downstream
channel.
– EuroDOCSIS CMs or set top boxes (STBs) with integrated EuroDOCSIS CMs using Cisco
MC16E Cable Modem Cards and Cisco IOS Release 12.1(1a)T1 or higher. EuroDOCSIS
operation support includes 8-MHz Phase Alternating Line (PAL) or Systeme Electronique
Couleur Avec Memoire (SECAM) channel plans.
• DOCSIS 1.0 Extensions
The Cisco uBR7200 series support DOCSIS 1.0 quality of service (QoS) extensions that include:
– Multi-SID support, allowing the definition of multiple Service IDs (SIDs) on the upstream:
Voice traffic can be designated on a higher QoS committed information rate (CIR) secondary
SID, while data traffic can be forwarded on a best-effort basis on a primary SID. Secondary
SIDs are higher QoS CIR-type classes that have a nonzero minimum reserved rate (CIR-type
service). These SIDs receive preferential treatment at the CMTS for grants over any tiered
best-effort type data SID of that upstream. Reliable operation with voice requires multiple
SIDs—at least two per CM to separate voice from data. In DOCSIS 1.0, SIDs are set up
statically. When supporting DOCSIS 1.0 extensions, SIDs can be set up statically or
dynamically. Both the CMTS and CM must support this capability.