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Cisco 677 SOHO/Telecommuter ADSL Router

The Cisco 677 Small Office Home Office (SOHO)/Telecommuter asymmetric digital subscriber line (ADSL) Router is designed to offer cost-effective high-speed services to small home offices and work-at-home users. The Cisco 677 provides a compact design and a low-cost, splitterless, no truck roll solution. It is part of the leading Cisco architecture that provides a path to new world services. The Cisco 677 provides access to high-speed and secure Internet and corporate services through a robust routing, transparent bridging, and PPP/ATM feature set.
Cisco 677 Overview

The Cisco 677 provides a 10/100BaseT interface for connection to a small, home-office LAN or a single Ethernet-equipped PC. The Cisco 677 supports a robust routing feature set for seamless integration of ADSL service into corporate or home LANs and WANs. A built-in Dynamic Host Configuration Protocol (DHCP) server automatically assigns IP addresses to PCs on the LAN, and with Port Address Translation (PAT) these PCs can share a single IP address. In addition, with Cisco EZ-DSL no-truck-roll technology, basic telephone service splitters are not required at the premise, thus reducing the cost of installation.

Physical Interfaces


  • Rate-adaptive DSL (Discrete Multi-Tone [DMT] Issue 2) interface, with maximum receive data rates up to 8024 Kbps and transmit data rates up to 864 Kbps
  • Future support for g.lite operation via software download, with a maximum receive data rate up to 1536 Kbps and transmit data rates up to 512 Kbps.
  • ADSL physical connection supports ATM adaptation layer 5 (AAL5) encapsulation
  • Support for Fast and Interleaved dual latency
  • Trellis coding and ATM bit/byte wide alignment
  • Autonegotiating 10BaseT or 100BaseTX Ethernet interface
  • Local initialization/configuration through RJ-45 serial port
  • Status LEDs indicating power/alarm, ADSL connectivity and activity, and Ethernet connectivity and activity
  • Utilizes Cisco EZ-DSL technology to deliver full Rate Adaptive Digital Subscriber Line (RADSL) rates without truck roll to the premise
  • Fully compatible with Cisco 6100 and Cisco 6200 series asymmetric digital subscriber line access concentrators (advanced DSLAM)


Routing and Bridging Support


  • IP routing (PPP over ATM and RFC 1483)
  • Supports null-encapsulated PPP over AAL5
  • Port Address Translation (PAT) support for conservation of registered IP addresses
  • Dynamic Host Configuration Protocol (DHCP) server and client support for dynamic IP address allocation
  • DHCP relay agent support
  • Optional support for IP address and subnet mask assignment via IP Control Protocol (IPCP)
  • Support for multiple IP addresses on the Ethernet interface
  • Multicast proxy support (IGMP Proxy) for support of video applications
  • Transparent bridging (RFC 1483) support
  • Managed bridge support for remote configuration and management


Configuration, Management, and Security


  • Remote management with Telnet or HTML browser interface
  • Trivial File Transfer Protocol (TFTP) support for software updates and configuration downloads/uploads
  • Cisco Commander user-based graphical user interface for connecting and monitoring the DSL link
  • RADIUS and SYSLOG support for remote status monitoring
  • Simple Network Management Protocol (SNMP) Management Information Base (MIB) support
  • PPP user authentication protocol (PAP)
  • Multilevel password protection

Figure 1: Cisco 677 SOHO/Telecommuter ADSL Router



  • Basic telephone service splitter---an optional passive splitter provides simultaneous analog voice and high-speed data on a single twisted-pair phone line
  • EZ-DSL inline and wall-mount microfilters for splitterless installations


Cisco 677 Hardware Specifications

5.0 x 6.2 x 1.75 in.


(12.7 x 15.7 x 4.5 cm)


1.5 lb

Power Source

110-240 VAC

LAN Interface

10BaseT/100BaseT Ethernet, half-duplex RJ-45 connector

ADSL Interface

ADSL, DMT encoding:


ANSI T1.413 Issue 2 (Full rate DMT over analog POTS)


G.992.1 Annex A (full-rate DMT over analog POTS)


G.992.2 Annex A (G.lite)


RJ-11 connector

Data Rate

DMT Full Rate (g.dmt) ADSL

  • Downstream Speed Range: 32 kbps to 8032 Kbps
  • Upstream Speed Range: 32 Kbps to 864 Kbps
  • Increments: 32 Kbps

G.lite ADSL (future)

  • Downstream Speed Range: 32 Kbps to 1536 Kbps
  • Upstream Speed Range: 32 Kbps to 512 Kbps
  • Increments: 32 Kbps
Local Serial Interface


Software Upgrade

Via built-in Flash ROM

Power Requirements

5V DC @ 1.0 Amps

Operating Requirements

Temperature: 32 to 104° F (0 to 40° C)

Humidity: 5 to 90% (noncondensing)

Regulatory Approvals and Compliance

FCC Part 15, Subpart B, 1997; CSA Std. C108.8 (1993); VCCI, 1995; AS/NZS 3548: 1995; EN55022: 1994/CISPR 22: 1993; EN50081-1: 1997; CNS 13438; UL 1950 3rd Edition; CSA C22.2. No. 950; VCE per EN60950/IEC950 Amendment 4; CE Marked for Electromagnetic Certifications (EMC) and Safety

LED Indicators

LAN indicator: connection and activity

ADSL indicator: connection and activity

Power indicator

Software Specifications
Software Options
  • G.lite (future)
  • Full-rate DMT
  • Single-user
  • Multi-user
Standards Compliance


  • ATM Forum UNI Version 3.1 PVC
  • IEEE 802.3 and 802.3u 10BaseT and 100BaseTX physical layer specification
Routing and Bridging Support
  • IETF RFC 2364 Point-to-Point Protocol (PPP)
  • IETF RFC 1483 encapsulation over AAL5
  • IP (RFC 791)
  • UDP (RFC 792)
  • ICMP (RFC 791)
  • ARP (RFC 826)
  • RIP version 1 and RIP version 2 updating of routing tables
  • Static routing
  • Port Address Translation (PAT)
  • Dynamic Host Configuration Protocol (DHCP) server and client (RFC 2131, RFC 2132)
  • DHCP Relay Agent (RFC 1542)
  • IEEE 802.1d transparent learning bridging
  • RADIUS security and accounting (RFC 2058, RFC 2059)
  • HTML browser interface
  • Command-line interface
  • Cisco Commander Graphical User Interface (GUI)
  • Telnet
  • TFTP
  • SNMP MIB support (MIB-II, PPP MIB, spanning tree MIB, enterprise MIB)
  • PAP
  • Multilevel password protection

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