User guide

March 2005 Glossary
Through Software Release 6.1
Page 424 of 425 Issue 1
Canopy System User Guide
su -
A command that opens a Linux
®
operating system session for the user
root.
Subnet Mask
32-bit binary number that filters an IP address to reveal what part
identifies the network and what part identifies the host. The number of
subnet mask bits that are set to 1 indicates how many leading bits of
the IP address identify the network. The number of subnet mask bits
that are set 0 indicate how many trailing bits of the IP address identify
the host.
Subscriber Module
Customer premises equipment (CPE) device that extends network or
Internet services by communication with an Access Point Module or an
Access Point cluster.
Sustained Data Rate
Preset rate limit of data transfer.
Switch
Network element that uses the port that is associated with the physical
address of another to pass data to only the intended recipient.
Compare to Bridge and Router.
SYN/1
Second-from-right LED in the module. In the Access Point Module or
Backhaul timing master, as in a registered Subscriber Module or
Backhaul timing slave, this LED is continuously lit to indicate the
presence of sync. In the operating mode for a Subscriber Module or
Backhaul timing slave, this LED flashes on and to indicate that the
module is not registered. In the aiming mode for a Subscriber Module
or a Backhaul timing slave, this LED is part of a bar graph that
indicates the quality of the RF link.
Sync
GPS (Global Positioning System) absolute time, which is passed from
one module to another. Sync enables timing that prevents modules
from transmitting or receiving interference. Sync also provides
correlative time stamps for troubleshooting efforts.
TCP
Alternatively known as Transmission Control Protocol or Transport
Control Protocol. The Transport Layer in the TCP/IP protocol stack.
This protocol is applied to assure that data packets arrive at the target
network element and to control the flow of data through the Internet.
Defined in RFC 793. See http://www.faqs.org/rfcs/rfc793.html
.
tcp
Transport Control type of port. The Canopy system uses Port 3306:tcp
for MySQL
®
database communications, Port 9080:tcp for SSE telnet
communications, and Port 9090:tcp for Engine telnet
communications.
TDD
Time Division Duplexing.
TDMA
Time Division Multiple Access.