User's Manual

An ARCell Wireless System looking up a narrow canyon from one end may have only one
ARCell Hub Transceiver.
Cables are run from the Hub Transceiver(s) to the base station’s Wireless Cable Modem
Termination System (W-CMTS) in the equipment room. The equipment room also has a
Gateway to access the Internet, the transceiver power supply, etc.
The ARCell AR3155 Subscriber Transceiver is mounted outdoors at the subscriber location with
line of sight to the Hub Transceiver. A single TV-type coaxial cable is run indoors to the modem
and computer(s).
The transceivers have a weatherproof housing containing transmit and receive antennas and
electronics.
The Wireless CMTS (W-CMTS) Base Station controls the flow of data between the Internet and
each subscriber’s Wireless Cable Modem (WCM) using the DOCSIS

suite of protocols. The
W-CMTS transmits Downstream (Hub to subscriber) a continuous flow of user data interspersed
with control commands to each WCM in the system. When a user has data to transmit
Upstream (subscriber to Hub) to the Internet, the WCM turns on its transmitter, sends its data to
the Hub Transceiver, and then turns off its transmitter. The DOCSIS protocol manages the time
slot assignment.
The Arcwave Network Manager is an IBM-compatible PC with the Windows 2000 operating
system plus management and provisioning software, including an SNMP package. It also
provides the system with TCP/IP-related services such as DHCP, TFTP and TOD
1
. V3000W
requires an external PC and ARCell’s network management package. The BSR1000W comes
with command-line management internal and ARCell’s network management package can be
added to provide TCP/IP services, if they are not already available in the network.
The Gateway to the Internet provides certain TCP/IP and ISP functions such as routing, address
translation, caching, security, etc. The Gateway consists of a router or a PC running ISP-
provided software (possibly a form of Unix) and may also include external hardware such as a
router, CSU/DSU, etc.
The protocols that govern the operation of the ARCell License-Free, Point-to-Multipoint Wireless
Broadband Solution generally conform to the cable TV industry DOCSIS standard, as enhanced
for wireless operation.
1.1 Subscriber Site
The ARCell License-Free, Point-to-Multipoint Wireless Broadband Solution subscriber
installation consists of the AR3155 Integrated Subscriber Transceiver mounted on the exterior
of the subscriber facility and the Wireless Cable Modem (WCM) located inside the structure. A

DOCSIS is a trademark of Cable Television Laboratories, Inc.
1
SNMP = Simple Network Management Protocol
TCP = Transmission Control Protocol
IP = Internet Protocol
DHCP = Dynamic Host Configuration Protocol
TFTP = Trivial File Transfer Protocol
TOD = Time of Day
June 2003 Page 1-2