Technical data

JSC 36381 MARCH 30, 2000
Baseline
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folder. When the crewmember logs in, the drive letter H: is automatically mapped to
the crewmember’s personal home directory folder (see 4.2 Logon Scripts).
2.5 TCP/IP Communication
As noted earlier, OPS LAN communicates in the language of the Internet, TCP/IP
(Transport Control Protocol/Internet Protocol). A system of logical addresses (as
opposed to network adapter hardware addresses) identifies each host, or end station on
a TCP/IP network. The logical ID, called an IP address, consists of four numbers, called
octets, which are separated by periods. The pattern of octets in an IP address, called a
class, along with a subnet mask, uniquely identifies the host, as well as the network
segment the host resides in. Proprietary Table E-1 OPS LAN IP ADDRESS SUMMARY
and Proprietary Table E-2 OPS LAN ASSIGNED NETWORK PARAMETERS list
specific IP address allocation.
2.5.1 Subnet Mask
Although an IP address is a single value, it contains two pieces of information: the
network ID and the host ID of the computer or TCP/IP device. The subnet mask is a
32-bit value that allows the recipient of IP packets to distinguish the network ID
portion of the IP address from the host ID.
2.5.2 Default Gateway
The File Server is designated as the network default gateway, until the arrival of the
onboard OCA router.
2.5.3 HTTP Information Protocol
HTTP (Hypertext Transport Protocol) is a distributed, collaborative, hypermedia
information system associated with TCP/IP. HTTP technology enables what is
commonly referred to as the World Wide Web. Web pages are files consisting of
images, audio clips, video clips, animation or text written in the Hypertext Markup
Language (HTML). Every OPS LAN laptop is equipped with the Microsoft Internet
Explorer (MSIE) for viewing and interacting with HTML web pages that might be
posted on the Internet, the OPS LAN File Server (See Section 3.1.7 Web-based
Services Support) or locally, as with graphical help files.
2.5.4 Internet Accessibility
At the present time, OPS LAN users are unable to communicate with the Internet.
Conversely, users on the Internet will not be able to directly address the OPS LAN.