The Cisco 1721 Modular Access Router is designed to help organizations embrace the productivity benefits of e-business applications. The Cisco 1721 router enables e-business by delivering secure Internet, intranet, and extranet access with virtual private networks (VPNs) and firewall technology. The Cisco 1721 router offers:
Wide array of WAN access options, including high-speed business-class digital subscriber line (DSL)
High-performance routing with bandwidth management
Inter-virtual LAN (VLAN) routing
VPN access with firewall option
The Cisco 1721 router offers the following key features:
A RISC processor to support high-performance routing, encryption, and broadband services
One autosensing 10/100 Fast Ethernet port
Two WAN interface card (WIC) slots that support the same data WAN interface cards as the Cisco 1600, 2600, and 3700 routers
One auxiliary (AUX) port (up to 115.2-kbps asynchronous serial)
One console port
One internal expansion slot for the hardware-assisted VPN encryption card (MOD1700-VPN)
Physical Interfaces/Ports
One 10/100BASE-TX Fast Ethernet port (RJ-45)
Automatic speed detection
Automatic duplex negotiation
IEEE 802.1Q VLAN routing
Two WAN interface card slots
Supports any combination of two WAN interface cards as shown in Table 3
One auxiliary (AUX) port
RJ-45 jack with EIA/TIA-232 interface
Asynchronous serial data terminal equipment (DTE) with full modem controls Carrier Detect, data set ready (DSR), Request To Send (RTS), Clear To Send (CTS)
Asynchronous serial data rates up to 115.2 kbps
One console port
RJ-45 jack with EIA/TIA-232 interface
Asynchronous serial DTE
Transmit/receive rates up to 115.2 kbps (default 9600 bps, not a network data port)
No hardware handshaking such as RTS/CTS
One internal expansion slot for support of hardware-assisted services such as VPN encryption
(up to T1/E1 performance)
WAN Interface Specifications (Optional)
Synchronous serial interfaces on serial WAN interface cards
Interface speed: up to 2.0 Mbps (T1/E1)
Synchronous serial protocols: Point-to-Point Protocol (PPP), High-Level Data Link Control (HDLC),
Link Access Procedure, Balanced (LAPB), IBM Systems Network Architecture (SNA)
Synchronous serial WAN services: Frame Relay, X.25, SMDS
Synchronous serial interfaces supported on the WIC-1T, WIC-2T, and WIC-2A/S cards: V.35, EIA/TIA-232, EIA/TIA-449, X.21, EIA-530
Asynchronous serial interfaces on serial WAN interface cards
Interface speed: up to 115.2 kbps
Asynchronous serial protocols: PPP, Serial Line Internet Protocol (SLIP)
Asynchronous interface: EIA/TIA-232
ADSL WAN interface card
Supports ATM adaptation layer 5 (AAL5) services and applications
Interoperates with Alcatel DSL access multiplexer (DSLAM) with Alcatel chipset and Cisco 6130/6260 DSLAM with Globespan chipset
Complies with ANSI T1.413 issue 2 and ITU 992.1 (G.DMT)
G.shdsl WAN interface card
Based on the ITU G.991.2, delivers symmetrical data rates from 192 kbps to 2.3 Mbps; speeds vary, depending on loop length and line conditions
ISDN WAN interface cards
ISDN dialup and ISDN DSL (IDSL) at 64 and 128 kbps
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