Cisco 880 Series User Manual download pdf (Page 10)

Data Sheet

Feature Description

Telephony interface signaling support Cisco 880 SRST supports the following signaling protocols:

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FXS loop-start and ground-start signaling

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FXO

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Inbound signaling (such as dual-tone multifrequency [DTMF] and multifrequency support)

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BRI QSIG

Voice features

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Echo cancellation: This feature cancels echo on tail circuits up to 64 msec (configurable tail length).

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Silence suppression and voice activity detection (VAD): Bandwidth is used only when someone is

speaking. During silent periods of a phone call, bandwidth is available for data traffic.

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Comfort-noise generation: This feature reassures the phone user that the connection is being

maintained, even when no voice packets are being transmitted.

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Caller ID support: Per-port caller ID (with per-call unblocking) is configurable over analog FXS.

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Dial-plan mapping: This feature simplifies configuration and management through automatic mapping

of dialed phone numbers to IP addresses.

Voice port-specific features

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FXS: FXS provides battery polarity reversal detection and initiation for disconnect supervision and far-

end answer supervision.

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ISDN BRI network side and phantom power: The BRI port provides the ability to connect a private

branch exchange (PBX) or private automatic branch exchange (PABX) configured as user side

directly to the router. It also provides phantom power to accommodate equipment that requires it.

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LED indicators show voice-processing resources and port status.

Fax and modem

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Fax and modem pass-through allows fax and modem traffic to pass through a voice port.

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Fax Relay provides a more robust protocol for fax transmission over packet networks. It also supports

the T.37 and T.38 fax protocols.

High-performance flexible digital-signal-

processor (DSP) architecture

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Channel capacity: Cisco 880 SRST supports up to four voice channels.

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Flexible DSP architecture: There is no need to specify codec complexity at configuration.

An appropriate codec is dynamically selected when a call is established, while allocating DSP

resources optimally.

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Feature upgrades: The DSP architecture allows for addition of new features through simple code

updates.

System Specifications

Tables 9 and 10 list the system specifications for the Cisco 880 Series Routers.

Table 9. System Specifications

Feature Description

Default DRAM

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256 MB on Cisco 880 Series data models

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512 MB on Cisco 880 Series WLAN and SRST models

Maximum DRAM

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768 MB

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1024 MB on Cisco 880 Series WLAN

Default and maximum flash memory

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128 MB on Cisco 880 Series data models

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256 MB on Cisco 880 Series SRST models

WAN

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Fast Ethernet

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Multi-mode VDSL2 and ADSl2/2+ over ISDN with ISDN backup

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Multi-mode VDSL2 and ADSl2/2+ over POTS

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ADSL2/2+ over ISDN with ISDN backup

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ADSL2/2+ over POTS with ISDN backup

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VDSL2 over POTS with ISDN backup

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G.SHDSL (2- and 4-wire support) with ISDN backup

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Fast Ethernet and 3G WAN for Code Division Multiple Access (CDMA) and high-speed downlink

packet access (HSDPA)

LAN switch Managed 4-port 10/100BASE-T with autosensing MDI/MDX for auto crossover

Standard 802.11g/n access point based

on IEEE 802.11n draft 2.0 standard

Optional on all models

Console or auxiliary port RJ-45

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Cisco 880 Series User Manual Page 10

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