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RAD
TinyRouter Miniature Wire-speed IP Router |
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- TinyRouter is a high
performance, miniature IP router. It is based on
RAD's unique IP router chip, the ChipRouter, and
therefore operates with minimal software. Its small
size and low cost make it ideal for cost-sensitive
routing applications. It requires only one software
parameter to be configured making it a plug and play
device.
- TinyRouter works by
taking each Ethernet frame from the LAN and
determining whether the IP packet is destined for
the IP net on the Ethernet LAN. If not, TinyRouter
forwards the packet to the WAN link. IP packets
received from the WAN are automatically forwarded to
the LAN if the IP net matches.
- TinyRouter includes
hardware filters which handle all filtering
operations at wire speed from both LAN-to-WAN and
WAN-to-LAN, without dropping a single packet.
Filtering and forwarding are performed at the
maximum rate of 35,000 and 30,000 frames per second
(wire speed), respectively. The buffer can hold 256
1534-byte frames with a throughput latency of one
frame.
- TinyRouter is
available with 10Base5 (AUI) or 10BaseT (UTP)
interfaces and is fully
IEEE 802.3 / Ethernet v2 compliant. The 10BaseT
interface can also operate in full duplex Ethernet
applications.
- A choice of WAN
interfaces is available, including V.24, V.35, V.36,
X.21, RS-530, fiber optic or internal 4-wire modem.
In the case of electrical WAN interfaces, the
TinyRouter acts as a DTE device to the WAN. The
integral 4-wire interface allows wire speed routing
over copper cabling in the campus, up to distances
of 1300m/4265 ft depending on cable type (see Figure
3).
The integral fiber optic interface allows
wire-speed IP routing over fiber up to 36 km/22.5
miles (see Figure 3).
The WAN interface operates transparently in simplex,
half duplex or full duplex modes. Variable link
speeds up to 10 Mbps are supported transparently.
The link speed may be adjusted
"on-the-fly" without any effect on the
TinyRouter. In addition, the TinyRouter provides
hardware based traffic throughput control at user
configured speeds of 64 kbps, 128 kbps, 512 kbps, 1
Mbps and 10 Mbps. TinyRouter can operate with
asymmetrical Tx and Rx speeds.
- TinyRouter can be used
as a Frame Relay Access Device (FRAD) with an
integral IP router. RFC 1490 is supported for a
single DLCI on the WAN link. Auto-discovery of the
DLCI and the maintenance protocol is performed
automatically. This allows the TinyRouter to be used
as the termination unit of IP services over Frame
Relay at the customer premises, opposite a Frame
Relay switch in the backbone. Alternatively,
Point-to-Point Protocol (PPP) can be run on the WAN
link with automatic negotiation on power-up, as well
as support for PAP and CHAP authentication. With
this feature, TinyRouter can operate opposite any
PPP compliant access server or backbone router (see
Figure 1). TinyRouter supports HDLC, which is
especially important for broadcast and multicast
applications, where bandwidth overhead is critical
(see Figure 2).
- TinyRouter supports IP
multicast at wire speed, making it suitable for any
multicast environment including high-speed
downstream environments, such as satellite and xDSL.
Users on the LAN can register with the TinyRouter
for an IP multicast group using the IGMP, protocol
that then filters IP multicast packets at
wire-speed.
- Management and
advanced configuration is achieved using Telnet and
the SNMP agent provided on the TinyRouter
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