Bandwidth-on-demand remote office network apparatus and method

• US 5,546,379 A
• Filed: 08/26/1994
• Issued: 08/13/1996
• Est. Priority Date: 10/01/1993
• Status: Expired due to Fees

• Current Assignee: NEC Corporation of America (NEC Corporation)
• Original Assignee: NEC America Inc (NEC Corporation)
• Inventors: Thaweethai, Ladavan, Moon, Tien-Jan A.
• Primary Examiner(s): Marcelo, Melvin
• Assistant Examiner(s): VU, HUY DUY
• Application Number:
  US08/295,051
• Time in Patent Office: 718 Days
• Field of Search: 370/24, 370/110.1, 370/32, 370/41, 370/112, 370/53, 370/56, 370/68.1, 370/85.13, 370/13, 370/17, 375/219, 375/222, 375/121, 375/220, 379/93, 379/94, 340/825, 340/825.06, 340/825.15
• US Class Current: 370/254
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 63/08 for authentication of entities cryptographic mechanisms or cryptographic arrangements for entity authentication H04L9/32
• CPC Class Codes: H04L 69/14 Multichannel or multilink protocols
• CPC Class Codes: H04L 9/40 Network security protocols

Abstract

A wide-area computer network system provides bandwidth based on network demand, throughput, and delay requirements, distribution of network load over multiple, parallel connections from the originating node to a destination node, a method of enabling efficient exchange of packet data routing information, modem pooling, an authentication procedure, and a virtual interface as a logical network interface for providing circuit switched connectivity, such as a connection between a host/application and a remote network.

Claims

1. A modem pooling control apparatus for automatically selecting a modem from among a number of modems according to a plurality of modem requirements defined by a user, the apparatus comprising:

storage means for storing a plurality of modem capability parameters associated with a plurality of different types of modems with different command sets;

selection means for automatically selecting, on the basis of the stored plurality of modem capability parameters, a selected modem from the plurality of modems, such that the selected modem meets the plurality of modem requirements defined by the user; and

means for interconnecting the selected modem with a remote modem.

2. A modem pooling control apparatus as recited in claim 1, further comprising:

pattern storage means for maintaining text patterns within said storage means,

said text patterns each comprising (1) a single modulation rate pattern text and (2) compression information comprising a plurality of items of compression pattern text;

means for receiving from said selected modem, after a connection to said remote modem has been successfully made, a modem response in the form of a text string;

response interpreting means for interpreting the modem response; and

scanning means for scanning said modem response for response patterns matching said text patterns.

3. A modem pooling control apparatus as recited in claim 2, further comprising

means for determining a capacity unit (CU) of said connection from those of said modulation rate pattern text and said compression information that match said response patterns.

4. A modem pooling control apparatus as recited in claim 1, wherein

said storage means includes means for storing said plurality of modem capability parameters as a plurality of modem definition records,

each said modem definition record comprising at least one modem entry, and

each said modem entry comprising at least one capability entry.

5. A modem pooling control apparatus as recited in claim 4, in which

said selection means includes capability interpreting means capable of interpreting said plurality of modem capability parameters while allowing said capability entry to comprise multiple text lines, and allowing a plurality of said capability entries to be comprised by a single text line.

6. A modem pooling control apparatus as recited in claim 4, in which

said selection means includes capability interpreting means capable of interpreting and using said plurality of modem capabilities parameter to select said selected modem from said plurality of modems regardless of how said capability entries are ordered within said

16. A modem pooling control apparatus as recited in claim 5, in which said selection means ignores space, tab, and line feed characters while interpreting said plurality of capability parameter.

17. A modem pooling control method as recited in claim 4, wherein space and tab characters are also ignored while interpreting said plurality of modem capability parameters.

7. A modem pooling control method for automatically selecting a modem from among a number of modems according to a plurality of modem requirements defined by a user, the method comprising steps of:

storing, in a database, a plurality of modem capability parameters associated with a plurality of different modems with a plurality of command sets;

automatically selecting, on the basis of the stored plurality of modem capability parameters, a selected modem from the plurality of modems, such that the selected modem meets the plurality of modem requirements defined by the user; and

interconnecting the selected modem with a remote modem.

8. A modem pooling control method as recited in claim 7, further comprising the step of

sending commands to said selected modem to configure said selected modem according to the plurality of modem requirements defined by said user.

9. A modem pooling control method as recited in claim 7, wherein said step of storing said plurality of modem capability parameter comprises the step of

maintaining a cross-reference between said plurality of different modems and a plurality of sets of characteristics of each of said plurality of different modems,

each said set of characteristics describing at least one possible configuration of a corresponding one of said plurality of different modems.

10. A modem pooling control method as recited in claim 9, further comprising the step of

sending commands to said selected modem to configure said selected modem according to the plurality of modem requirements defined by said user.

11. A modem pooling control method as recited in claim 7, wherein said step of automatically selecting said selected modem comprises the steps of:

identifying a subset of said plurality of modems such that each modem of said subset of modems (1) has characteristics compatible with said requirements defined by said user, and (2) is able to be configured according to said requirements defined by said user; and

selecting said selected modem from said subset of modems.

12. A modem pooling control method as recited in claim 11, further comprising the step of

sending commands to said selected modem to configure said selected modem according to requirements defined by said user before a connection between said selected modem and said remote modem is made.

13. A modem pooling control method comprising the steps of:

defining command strings needed for controlling a plurality of different types of modems;

storing, in a database, a plurality of modem capability parameters associated with a plurality of modems comprising the plurality of different types of modems and requiring a plurality of command sets, such that said plurality of modem capability parameters are organized into a plurality of modem definition records, each said modem definition record comprising at least one modem entry, and each said modem entry comprising at least one capability entry;

selecting, on the basis of the said plurality of modem capability parameters, a selected modem from the plurality of different types of modems; and

interconnecting said selected modem with a remote modem.

14. A modem pooling control method as recited in claim 13, further comprising the step of

interpreting said plurality of modem capability parameters while ignoring at least line feed characters, thereby allowing a single capability entry to be composed in multiple text lines and multiple capability entries to be defined on a single text line.

15. A modem pooling control method as recited in claim 13, further comprising the step of

interpreting said plurality of modem capability parameter without regard to how said capability entries are ordered within said modem entries, thereby not requiring said capability entries to be in a specific order within a said modem entry.