Abstract: A method and system detects a network connection in a communications system, such as a narrowband communications system, using Virtual Local Area Network (VLAN) identification. In one embodiment, a first node transmits a message to a specific second node among a group of second nodes. The message from the first node includes a source Medium Access Control (MAC) address, a broadcast address, and a unique VLAN identification corresponding to a port on the first node. The specific second node processes the message, and then transmits its own MAC address to the first node, along with the unique VLAN identification received in the original message from the first node. The first node then updates stored information about the second node and uses the information in future communications to the second node.

Abstract: A source specific multicast may be performed in a network, by inspecting a signal for a source specific multicast channel identifier. The source specific multicast identifier signal is then mapped to a frame switching identifier. The frame switching identifier can be mapped to the signal, allowing the signal to be directed a location based on the frame switching identifier.

Abstract: A communications system, such as a Digital Subscriber Line Access Multiplexer (DSLAM), or corresponding method increases available bandwidth for transmission of data, video, and audio to a customer premise, or curb node for further distribution to customer premises, within a network. In one embodiment, a system comprises a host digital terminal (HDT) including an Ethernet switch unit and multiple optical interface units coupled via a bus. The optical interface units are configured to communicate over an optical communications link with broadband cards of optical network units (ONUs). The ONUs also include data cards coupled to the broadband cards via a bus. The data cards are configured to communicate over end user communications links to end user nodes.

Abstract: A method and system generates a network quality clock signal in a communications system by synthesizing a first clock signal based on arrival rate of packets transmitted via a network link at a rate according to a network clock. The system then synthesizes a second clock signal is then synthesized based on the first clock signal. In one embodiment, the second clock signal has a frequency substantially the same as the network clock.

Abstract: The invention provides a compound of general formula I ##STR1## in which X represents a direct bond or a ##STR2## group.

Abstract: The present invention provides a melamine phosphonic acid salt of the general formula (I) ##STR1## in which R is hydrogen, methyl or a negative valency bond, and n is 1 when R is hydrogen or methyl, or 2 when R.sup.1 is a negative valency bond.The salts are useful as flame retardants in polymers.

Abstract: A reaction of alumina trihydrate, dimethyl methylphosphonate and a phosphonic acid of formula ##STR1## where R.sup.1 denotes an alkyl group of 1 to 4 carbon atoms, optionally substituted by at least one group selected from a hydroxyl group, a carboxyl group or a phosphonic acid group --P(O)(OH).sub.2, or a C.sub.6 to C.sub.12 aryl group and R.sup.2 denotes a hydrogen atom or an alkyl group of 1 to 4 carbon atoms, is useful as a flame retardant for polymers.

Abstract: The present invention provides a melamine phosphonic acid salt of the general formula (I) ##STR1## in which R is hydrogen, methyl or a negative valency bond, and n is 1 when R is hydrogen or methyl, or 2 when R.sup.1 is a negative valency bond.The salts are useful as flame retardants in polymers.

Abstract: The present invention provides a process for producing a metal or metalloid salt of methyl methy phosphonic acid which comprises reacting, under non-aqueous conditions, dimethyl methylphosphonate with a finely divided form of an oxide or hydroxide of one or more metals or metalloids from group IIA, IIB, IIIA, IVA, IVB, VA, VIB, VIIB or VIII of the Periodic Chart of Elements, at an elevated temperature.

Abstract: The present invention provides a composition comprising a combustible material containing urethane linkages; and as a smoke and toxic gas suppressant, a polyester which has an acid value below 30 mg KOH/g, preferably below 10 mg KOH/g, and which is derived from:Ia.[A] a component which contains 4 carboxyl groups or anhydride thereof, and which is preferably an aromatic component, orIb. a mixture of [A] and [B]:[B] one or more components which contain 2 to 12, preferably 2 to 4, carboxyl groups or 1 to 6, preferably 1 or 2, carboxylic anhydride groups, selected from:[B.sub.1 ] an aliphatic carboxylic acid compnent containing 2-16 carbon atoms; [[B.sub.2 ] a cyclic non-aromatic carboxylic acid containing 7-17 carbon atoms; and[B.sub.3 ] an aromatic carboxylic acid containing 8-16 carbon atoms; andII.

Abstract: The present invention relates to novel 6-phenyl-5-alkyl substituted-4,5-dihydro-3(2H)-pyridazinones of formula I: ##STR1## in which R.sub.1 is halogen, lower alkyl, lower alkoxy, NO.sub.2, NH.sub.2, NHCOR.sub.3 (R.sub.3 is H or C.sub.1 -C.sub.4 alkyl), CN, carboxy, lower alkoxycarbonyl, carbamoyl, CF.sub.3, or OH and R.sub.2 is C.sub.1 -C.sub.4 alkyl; the tautomeric forms and salts thereof; as their racemic mixtures or as the individual optically-active forms.Compounds (I) are useful in pharmaceutical preparations having improved antithrombotic activity.

Abstract: The present invention relates to novel 6-phenyl-5-alkyl substituted-4,5-dihydro-3(2H)-pyridazinones of formula I: ##STR1## in which R.sub.1 is halogen, lower alkyl, lower alkoxy, NO.sub.2, NH.sub.2, NHCOR.sub.3 (R.sub.3 is H or C.sub.1 -C.sub.4 alkyl), CN, carboxy, lower alkoxycarbonyl, carbamoyl, CF.sub.3, or OH and R.sub.2 is C.sub.1 -C.sub.4 alkyl; the tautomeric forms and salts thereof; as their racemic mixtures or as the individual optically-active forms.Compounds (I) are useful in pharmaceutical preparations having improved antithrombotic activity.

Abstract: Compounds of the class of substituted or unsubstituted 4-amino-3-(5-nitro-2-furyl)-1H-pyrazolo[3,4-d]pyrimidine and their 5-N oxides have antimicrobial properties and are active ingredients in pharmaceutical compositions and animal feedstuff compositions, an illustrative example is 4-amino-1-methyl-3-(5-nitro-2-furyl)-1H-pyrazolo[3,4-d]pyrimidine.

Abstract: Compounds of the class of substituted or unsubstituted 4-amino-3-(5-nitro-2-furyl)-1H-pyrazolo[3,4-d]pyrimidine and their 5-N oxides have antimicrobial properties and are active ingredients in pharmaceutical compositions and animal feedstuff compositions, an illustrative example is 4-amino-1-methyl-3-(5-nitro-2-furyl)-1H-pyrazolo[3,4-d]pyrimidine.