The GG45 (where GG stands for GigaGate, and 45 is to denote the backward compatibility with the 8P8C modular connector – often colloquially called RJ45) is a connector for high-speed Category 7 cable (generally known as Cat 7) LAN cabling developed by Nexans.
The cabling system was standardized in 2001 as IEC 60603-7-7, and then selected as a worldwide Category 7 cabling standard within ISO-11801.
GG45 connectors provide backwards compatibility for standard 8P8C (8P8C) connectors in a Category 6 cable interface (mode 1), where eight conductors are used for Cat 6 (100/250 MHz) operation.
In addition, GG45 has four additional contacts (two in each extreme corner) that interface with new high-speed Cat 7 600 MHz and Cat 7a 1000 MHz networks. Two twisted pairs are connected to these additional contacts, while the other two twisted pairs remain connected to the original 8P8C connector's most distant pins: 1 and 2; and 7 and 8. A Category 6 or 6A plug uses the original contact positions, but a Category 7 or 7A plug instead uses the contacts located in the four corners and has a protrusion that activates a switch within the jack for the alternative contact positions. This reduces crosstalk within the connector that higher speed data is sensitive to. The key advantage is that the GG45 interface therefore has plenty of headroom, combined with the ability to migrate to higher speed service by upgrading to Category 7A patch cords that activate the switch in the jack.[1]
Wikipedia entry:
Addresses in the private space are not allocated to any specific
organization and anyone may use these addresses without approval from
a regional Internet registry. However,
IP packets addressed from them
cannot be transmitted through the public Internet, and so if such a
private network needs to connect to the Internet, it must do so via
a network address translator (NAT) gateway, or a proxy server.
In this question we are joining TableA to TableB
An INNER JOIN will give you the results where there is a match between TableA and TableB on the join criteria.
A LEFT JOIN will return every record from the table on the left (TableA in this case) and only those records from TableB where there is a match on the join criteria.
A RIGHT JOIN does the exact opposite of the
LEFT JOIN. It will return every record from the table on the right
(TableB in this case) and only those records from TableA where there is a
match on the join criteria.
A UNION ALL statement takes the results of two or more queries and returns them as one dataset. The only caveat is that the columns being returned must match for all queries.
ROM stands for Read-Only-Memory. This type of memory is static with regards to the storage in that the changes to the ROM are not allowed (in most cases).
