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Cisco 800 Series Routers

Cisco 880VA Series ISR G2 Multimode DSL Routers Q and A

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Product Overview and Positioning

Q. What are the Cisco ® 880VA Series Integrated Services Routers Generation 2 (ISR G2s)?
A. These routers are additions to the Cisco 880 Series ISR G2 product portfolio of fixed-configuration routers that provide collaborative business solutions for secure voice and data communication to small businesses and enterprise teleworkers. They complement the current Cisco 880 Series ISR portfolio by supporting mutimode very-high-data-rate DSL 2 (VDSL2) and asymmetric DSL 2+ (ADSL2+) DSL technology. Refer to the Cisco 880VA Series data sheet to learn more about the advanced technologies that these platforms support.
Q. What is the difference between the Cisco 880VA Series and the Cisco 800 Series ADSL2 and ADSL2+ routers?
A. The Cisco 880 Series ADSL2 and ADSL2+ routers include the Cisco 886, 887, and 887M Integrated Services Router (ISR) platforms, based on the ST Micro 20196-PA chipset. These models provide ADSL2+ over ISDN, ADSL2+ over basic telephone service, and ADSL2+ over basic telephone service Annex M as the primary WAN interface. The new Cisco 880VA Series routers use the same base architecture as the Cisco 880 Series ADSL2 and ADSL2+ platforms. The primary difference between the new series and the original series is the support for multimode VDSL2 and ADSL2+ with the same customer premises equipment (CPE) and WAN interface, taking advantage of the Broadcom chipset. In addition, the support of the ISDN Basic Rate Interface (BRI) backup interface is available only on the Cisco 886VA platforms.
Q. Can I continue to use and order the ST Micro-based Cisco 886, 887, and 887M platforms?
A. In September 2010, we will be announcing end of sale for the Cisco 880 Series ADSL and ADSL2+ platforms based on the ST Micro chipset. Please refer to the end-of-sale notice for these platforms for details.
Q. Do the new Cisco 880VA platforms have the same architecture and memory configuration as the other Cisco 880 Series products?
A. Yes, these new Cisco 880VA Series multimode DSL platforms have the same baseline architecture and default memory configurations as other shipping Cisco 880 Series products.
Q. Are there third-generation (3G) and wireless LAN (WLAN) options?
A. At first customer shipment (FCS), 3G and WLAN options are not available.
Q. Are there voice options?
A. No voice products are available for the Cisco 880VA Series multimode DSL platforms.

DSL Features

Q. Which xDSL technologies do the Cisco 880VA Series support?
A. The Cisco 880VA Series routers support the DSL technologies listed in Table 1.

Table 1. DSL Technologies Supported by the Cisco 880VA Series

Model

DSL Technology

Minimum Cisco IOS® Software Release Requirement

Cisco 886VA

ADSL2 and ADSL2+ over ISDN (Annex B) and VDSL2

15.1(2)T

Cisco 887VA

ADSL2 and ADSL2+ over basic telephone service (Annex A) and VDSL2

15.1(2)T

Cisco 887VA-M

ADSL2 and ADSL2+ over basic telephone service (Annex M) and VDSL2

15.1(2)T

Q. What is VDSL2?
A. Very-high-data-rate DSL 2 (VDSL2) is an access technology that exploits the existing infrastructure of copper wires that were originally deployed for basic telephone services. You can deploy it from central offices, from fiber-fed cabinets located near the customer premises, or within buildings.
The newest and most advanced standard of DSL broadband wireline communications, VDSL2 is designed to support the wide deployment of services such as voice, video, data, high-definition television (HDTV), and interactive gaming. It has been standardized as ITU G.993.2.
Q. What does Annex A and Annex B mean for VDSL2?
A. For ADSL, ITU G.992.1 Annex A refers to asymmetric DSL (ADSL) over basic telephone service, and ITU G.992.1 Annex B refers to ADSL over ISDN. For VDSL2, Annex A specifies band plans for the North American region and enables VDSL2 deployment with traditional basic telephony or in an all-digital mode. Annex B specifies band plans for Europe and enables VDSL2 deployment with underlying basic telephone and ISDN services.
Q. Does the Cisco 880VA Series support both Annex A and Annex B for VDSL2?
A. The Cisco 880VA Series platform supports VDSL2 Annex A and Annex B with band plans 997 and 998.
Q. Does the Cisco 880VA Series support both ATM and Ethernet Packet Transport Mode (PTM)?
A. The Cisco 880VA Series supports only PTM for VDSL2, and ATM for ADSL2 and ADSL2+.
Q. What is the maximum data rate that the Cisco 880VA Series can support?
A. Please refer to Table 2 for the VDSL2 profiles that the Cisco 880VA Series supports and the maximum data rate achievable by each profile. VDSL2 profiles are defined to help simplify network equipment configuration tasks for different regional deployment architectures such as central office, remote DSL access multiplexers (DSLAMs), digital loop carriers, and multiple-dwelling units. The actual data rate negotiated during the line training process depends on the profiles supported by the DSLAM, the distance of the CPE from the central office where the DSLAM is located, noise conditions, and other parameters associated with line quality.

Table 2. Supported VDSL2 Profiles

Profile

8a

8b

8c

8d

12a

12b

17a

Maximum data rate (upstream and downstream)

65 Mbps

65 Mbps

65 Mbps

65 Mbps

90 Mbps

90 Mbps

150 Mbps

Q. Will the Cisco 880VA Series work with any DSLAM?
A. Refer to the DSLAM interoperability document for a list of supported DSLAMs.
Q. What is Annex M?
A. Annex M is an enhancement of the G.992.3 standard that doubles the upstream bandwidth by “borrowing” 32 additional tones from the downstream frequency range. This feature enables service providers to provision symmetric data rates for ADSL2 and ADSL2+ services with data rates up to 2 Mbps. The achievable upstream rates are a function of loop length and specific DSLAM Annex M implementation.
Q. What does the term "mask" imply in Annex M?
A. The mask refers to the submode power-spectral-density (PSD) mask applicable for Annex M. Service providers use the mask to minimize the cross-talk between adjacent pairs to an acceptable level. G.992.3 specifies the masks, as shown in Table 3.

Table 3. Annex M Masks

Upstream Mask Number

Designator

Cutoff Frequency f1 (kHz)

Upstream Tones

Downstream Tones

1

EU-32

138.00

6-32

58-255

2

EU-36

155.25

6-36

58-255

3

EU-40

172.50

6-40

58-255

4

EU-44

189.75

6-44

58-255

5

EU-48

207.00

6-48

58-255

6

EU-52

224.25

6-52

58-255

7

EU-56

241.50

6-56

58-255

8

EU-60

258.75

6-60

61-255

9

EU-64

276.00

6-64

65-255

Q. What mask does Cisco 887VA-M support?
A. Cisco 887VA-M is optimized for Mask M 9. It can operate in other masks, but the performance may be lower than a CPE that is optimized for that mask.
Q. Does Cisco 887VA-M support the PSD mask required to comply with the Annex M standards in the United Kingdom?
A. Yes, Cisco 887VA-M supports UK Annex M requirements.
Q. Is Annex M supported on the Cisco 887VA Annex A platform?
A. At product FCS, Annex M is not supported on the Cisco 887VA Annex A platform. Annex M support will be enabled on the Cisco 887VA Annex A platform with a later Cisco IOS ® Software release.
Q. Is Annex A supported on the Cisco 887VA-M Annex M platform?
A. Yes, Annex A is supported on the Cisco 887VA-M Annex M platform. However, the Cisco 887VA-M platform is optimized for Annex M performance. You should deploy the Cisco 887VA Annex A platform if you need optimized Annex A performance.
Q. What is INP?
A. INP stands for Impulse Noise Protection. Support for INP allows the CPE to provide error-correction capability for impulse noise. The unit for this parameter is in number of symbols. Support for up to 16 symbols is provided by an amendment to the original G.992.5 standard and is referred to as extended INP function (G992.5-addemdum II edited in May 2005). Support for optional INP capability of at least 16 Discrete Multi-Tone (DMT) symbols (INP= 16) protects against impulse noise of up to 4 milliseconds. Increasing the INP also increases the latency.
Q. Do the Cisco 880VA Series platforms support extended INP functions?
A. Extended INP is supported on the Cisco 880VA Series platforms.
Q. What is DPBO?
A. DPBO stands for Downstream Power Back-Off. It was introduced with Amendment 2 of the G.992.5 ADSL2+ standards in March 2006 and G.997.1 (Ploam). This feature is typically used by outdoor or cabinet DSLAMs located close to the customer premises and the DSL CPE.
Q. Do the Cisco 880VA Series platforms support DPBO?
A. DPBO is supported on the Cisco 880VA Series platforms.
Q. Can DSL modem firmware be upgraded?
A. DSL modem firmware can be independently upgraded on the Cisco 880VA Series, without upgrading IOS image.
Q. Can the same firmware be applied to both the ADSL and VDSL2 technologies?
A. The Broardcom multimode chipset and firmware releases for the chipset support both ADSL and VDSL2 technologies.

For more information about the Cisco 880 Series, refer to the Cisco 880 Series data sheets and Cisco 880 and 860 Series Q&A.

Software Features

Q. What Cisco IOS Software and security features are supported by the Cisco 880VA Series?
A. The same Cisco IOS Software and security features available on the original Cisco 880 Series platforms are supported on the new multimode DSL platforms, except for some ATM features. Please refer to the Cisco 880 Series data sheet for features supported by the different feature sets.
Q. How is the ATM feature support different on the new Cisco 880VA Series multimode DSL platforms compared to the Cisco 880 Series ADSL2 and ADSL2+ platforms?
A. Because of the updated design using the Broadcom chipset, there are some differences in ATM feature support compared to the original Cisco 886, 887, and 887M platforms. Please refer to Table 4 for the comparison.

Table 4. ATM Feature Comparison

ATM Feature

Cisco 886, 887, and 887M

Cisco 886VA, 887VA, and 887VA-M

ATM traffic shaping

Constant bit rate (CBR), unspecified bit rate (UBR), Variable Bit Rate realtime (VBR-rt), Variable Bit Rate non-realtime (VBR-nrt), and UBR-Plus

CBR, UBR, VBR-rt, and VBR-nrt

Peak-cell-rate (PCR) and sustained-cell-rate (SCR) values

Starting from 32 kbps with a granularity of 8 kbps

Starting from 64 kbps with a granularity of 16 kbps

Number of permanent virtual circuits (PVCs)

10

4

Tx-ring limit

Tx-ring range: 1-16

Tx-ring range: 2-128

Default value: 128

Queue-depth command for high and low water mark configuration

Not applicable

New command-line interface (CLI) for quality of service (QoS)

Range: 2-400

Default value: 128 or 124

Maximum-transmission-unit (MTU) support in bytes

4470

1520

Q. Do the Cisco 880VA Series platforms require software activation for Cisco IOS Software feature support?
A. The same Cisco IOS Software activation concept implemented for the original Cisco 880 Series applies to the new Cisco 880 Series multimode DSL platforms. Please refer to Table 5 for Cisco IOS Software licensing options for these platforms.

Table 5. Cisco IOS Software License Options for the Cisco 880 Series ADSL2 and ADSL2+ Platforms

Product ID (PID)

Default Cisco IOS Software Feature License

Optional Upgrade

CISCO886VA-K9

Advanced Security
SL-880-ADVSEC

Advanced IP Services
SL-880-AIS

CISCO886VA-SEC-K9

Advanced IP Services
SL-880-AIS

None

CISCO887VA-K9

Advanced Security
SL-880-ADVSEC

Advanced IP Services
SL-880-AIS

CISCO887VA-SEC-K9

Advanced IP Services
SL-880-AIS

None

CISCO887VA-M-K9

Advanced Security
SL-880-ADVSEC

Advanced IP Services
SL-880-AIS

CISCO887VA-M-SEC-K9

Advanced IP Services
SL-880-AIS

None