Cisco 877W - Integrated Services Router User Manual download pdf (Page 6)

Q&A

virtual auxiliary port. The Cisco 850 Series does not support dial backup but does support out-of-band

management on its virtual auxiliary port.

Q. Can you explain the virtual auxiliary port function?

A. On Cisco 870 Series routers, the console port supports modem control signals. By connecting an external

modem to this port, this interface can be used for out-of-band remote management of the router or as a backup

WAN interface. An optional RJ-45 to DB-25 male straight-through cable is available as an orderable option to

connect modems to this port. A limited set of modems and terminal adapters has been tested, but any Hayes-

compatible modem or terminal adapter can be used to connect to this port. The console port will behave like a

standard Cisco auxiliary (AUX) port if configured as such and can provide bit rates up to 115.2 kbps.

The Cisco 850 Series supports only out-of-band management with this feature.

Q. Is it possible to upgrade a nonwireless model to support wireless?

A. No, a nonwireless model can never be upgraded to support wireless. The Cisco 870 Series and Cisco 850

Series have two separate versions, a wireless model and a nonwireless model.

Q. What is the use of the reset button on Cisco 870 and 850 Series routers?

A. The reset button is used to restore the router to the default factory settings if pressed within 5 seconds of router

power up. In line with this implementation, the following scenarios are possible:

●

The router will not react to the reset button if pressed after the 5 seconds of power up.

●

When the reset button is pressed within 5 seconds of boot up and there is no valid xxx.cfg file in the flash

memory, the router boots up with the factory defaults.

●

When the reset button is pressed within 5 seconds of boot up and there is a valid xxx.cfg file in the flash, the

router boots up with the xxx.cfg file and avoids the startup-config file in NVRAM.

DSL Features

Q. What are the DSL models in the Cisco 800 Integrated Services Routers?

A. Cisco 870 Series and Cisco 850 Series support ADSL over analog telephone lines (Cisco 877 and Cisco 857),

ADSL over analog telephone lines with annex M support (Cisco 877M), ADSL over ISDN (Cisco 876), and

G.SHDSL (Cisco 878). Customers can choose the router models based on the DSL technologies they intend to

deploy.

Q. Do the platforms support ADSL2/2+?

A. The Cisco 857, 876, 877 and 877M routers support ADSL2/2+ standards.

Q. What DSL chipset is used on Cisco 870 Series and Cisco 850 Series routers?

A. The Cisco 870 Series and Cisco 850 Series routers use the ST Micro (previously known as Alcatel

Microelectronics) MTK20196 chipset. The Cisco SOHO 90 and Cisco 830 Series routers use the ST Micro

MTK20150 chipset.

Q. What’s the difference between the Cisco 877 and Cisco 877M?

A. Cisco 877M provides annex M support with the MTK20196P chipset. Cisco 877 can not be upgraded to provide

annex M support.

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 2Mbps. The achievable upstream

rates are a function of loop length and specific DSLAM Annex-M implementation.

1 2 3 4 5 6 7 8 9 10 11

Q&A 1
Table 4. Annex-M Masks 7

Comments to this Manuals

No comments

Cisco 877W - Integrated Services Router User Manual Page 6

Comments to this Manuals

Related products and manuals for Networking Cisco 877W - Integrated Services Router