公开(公告)号：US5491692A

公开(公告)日：1996-02-13

申请号：US173719

申请日：1993-12-23

Applicant: Christopher W. Gunner ,  John A. Harper ,  Ian M. C. Shand

Inventor： Christopher W. Gunner ,  John A. Harper ,  Ian M. C. Shand

IPC: H04L12/56 ,  H04L12/46

CPC classification number: H04L45/04

Abstract: A communication network consists of end units (EUs) and distribution units (DUs) coupled together by links which may include local area networks (LANs). The units maintain neighbor tables by sending out Hello messages which indicate the unit type and contain the network service access point (NSAP) IDs or addresses of the units. Data messages (packets) mainly originate and end at EUs. An EU maintains only partial routing information about neighbors, while the DUs collectively maintain complete information about all NSAPs. So if an EU wants to send a packet to an EU which is not a neighbour (and sometimes even if it is), it need merely send it to a neighboring DU; that DU, along with the other DUs, must find a route to the destination EU. This invention provides a hybrid unit (HU), which acts as a DU to EUs but as an EU to DUs. The HU provides DU-like message forwarding but only on a local basis within a subnetwork of EUs and HUs.

Abstract translation: 通信网络由可能包括局域网（LAN）的链路耦合在一起的终端单元（EU）和分发单元（DU）组成。 这些单元通过发送指示单元类型的Hello消息来维护邻居表，并且包含单元的网络服务接入点（NSAP）ID或地址。 数据信息（数据包）主要来源于欧盟。 欧盟仅维护有关邻居的部分路由信息，而DU共同维护有关所有NSAP的完整信息。 因此，如果欧盟想向不是邻居的欧盟（有时甚至是）发送一个分组，那么它只需要发送给邻近的DU; 那DU以及其他DU都必须找到到目的地EU的路线。 本发明提供了一种混合单元（HU），其作为EU的DU，但作为EU的DU。 HU提供类似DU的消息转发，但仅在本地基于EU和HU的子网中。

公开(公告)号：US5307355A

公开(公告)日：1994-04-26

申请号：US647959

申请日：1991-01-30

Applicant: Anthony G. Lauck ,  Ian M. C. Shand ,  John Harper

Inventor： Anthony G. Lauck ,  Ian M. C. Shand ,  John Harper

IPC: G06F13/00 ,  H04L1/00 ,  G06F11/10 ,  H03M13/00

CPC classification number: H04L1/0061 ,  H04L1/0057

Abstract: A node operating in a network using the International Standard Organization (ISO) High-Level Data Link Control (HDLC) network protocol includes a mechanism for encoding information such that frames including the encoded information can be correctly interpreted by nodes operating in either of the standard 16-bit or 32-bit ISO-HDLC operating modes. The encoding mechanism produces a preliminary frame check sequence by encoding the information in an encoder using a generator polynomial G.sub.48 (x), which is a combination of the generator polynomials G.sub.16 (x) and G.sub.32 (x) which are used to produce frame check sequences for nodes operating in 16-bit or 32-bit modes, respectively. Before the information is encoded, the encoding mechanism sets the encoder to an initial condition using an initializing polynomial I.sub.48 (x). The preliminary frame check sequence is further encoded by adding to it a complementing polynomial C.sub.48 (x). The result is a 48-bit frame check sequence. The encoding mechanism appends the 48-bit frame check sequence to the information, and transmits the information and the appended 48-bit frame check sequence over the network as part of a frame.

Abstract translation: 在使用国际标准组织（ISO）高级数据链路控制（HDLC）网络协议的网络中运行的节点包括用于对信息进行编码的机制，使得包括编码信息的帧可以由标准中的任何一个运行的节点正确解释 16位或32位ISO-HDLC操作模式。 编码机制通过使用生成多项式G48（x）对编码器中的信息进行编码来产生初步帧校验序列，生成多项式G48（x）是用于产生帧校验序列的生成多项式G16（x）和G32（x）的组合） 对于分别以16位或32位模式运行的节点。 在信息编码之前，编码机构使用初始化多项式I48（x）将编码器设置为初始条件。 通过向其添加补码多项式C48（x），进一步对初步帧校验序列进行编码。 结果是一个48位的帧校验序列。 编码机制将48位帧校验序列附加到信息中，并且通过网络作为帧的一部分发送信息和附加的48位帧校验序列。

公开(公告)号：US5553085A

公开(公告)日：1996-09-03

申请号：US482166

申请日：1995-06-07

Applicant: Anthony G. Lauck ,  Ian M. C. Shand ,  John Harper

Inventor： Anthony G. Lauck ,  Ian M. C. Shand ,  John Harper

IPC: G06F13/00 ,  H04L1/00 ,  H03M13/00 ,  G06F11/10

CPC classification number: H04L1/0061 ,  H04L1/0057

Abstract: A node operating in a network using the International Standard Organization (ISO) High-Level Data Link Control (HDLC) network protocol includes a mechanism for encoding information such that frames including the encoded information can be correctly interpreted by nodes operating in either of the standard 16-bit or 32-bit ISO-HDLC operating modes. The encoding mechanism produces a preliminary frame check sequence by encoding the information in an encoder using a generator polynomial G.sub.48 (x), which is a combination of the generator polynomials G.sub.16 (x) and G.sub.32 (x) which are used to produce frame check sequences for nodes operating in 16-bit or 32-bit modes, respectively. Before the information is encoded, the encoding mechanism sets the encoder to an initial condition using an initializing polynomial I.sub.48 (x). The preliminary frame check sequence is further encoded by adding to it a complementing polynomial C.sub.48 (x). The result is a 48-bit frame check sequence. The encoding mechanism appends the 48-bit frame check sequence to the information, and transmits the information and the appended 48-bit frame check sequence over the network as part of a frame.

Abstract translation: 在使用国际标准组织（ISO）高级数据链路控制（HDLC）网络协议的网络中运行的节点包括用于对信息进行编码的机制，使得包括编码信息的帧可以由标准中的任何一个运行的节点正确解释 16位或32位ISO-HDLC操作模式。 编码机制通过使用生成多项式G48（x）对编码器中的信息进行编码来产生初步帧校验序列，生成多项式G48（x）是用于产生帧校验序列的生成多项式G16（x）和G32（x）的组合） 对于分别以16位或32位模式运行的节点。 在信息编码之前，编码机构使用初始化多项式I48（x）将编码器设置为初始条件。 通过向其添加补码多项式C48（x），进一步对初步帧校验序列进行编码。 结果是一个48位的帧校验序列。 编码机制将48位帧校验序列附加到信息中，并且通过网络作为帧的一部分发送信息和附加的48位帧校验序列。

公开(公告)号：US5557745A

公开(公告)日：1996-09-17

申请号：US407802

申请日：1995-03-20

Applicant: Radia J. Perlman ,  Ian M. C. Shand ,  Christopher W. Gunner

Inventor： Radia J. Perlman ,  Ian M. C. Shand ,  Christopher W. Gunner

IPC: H04L12/56 ,  H04L29/06 ,  G06F9/00 ,  G06F15/00

CPC classification number: H04L45/02 ,  H04L29/06 ,  H04L45/04 ,  H04L45/52

Abstract: A method of transferring foreign protocol information across a hierarchical backbone network is disclosed. The hierarchical backbone network operates according to a first protocol and includes multiple areas, some of which have a destination that operates according to a second protocol. Additionally, each area has at least one router located therein. The locations of the destinations in each area are identified to the router in that area. Information that identifies the locations of the destinations in each area is transferred to a router in each of the other areas regardless of whether the destinations are located in the same area as the router. Finally, information formatted according to the second protocol is transferred among any of the destinations.

Abstract translation: 公开了一种跨分层骨干网传送外部协议信息的方法。 分层骨干网根据第一协议操作，并且包括多个区域，其中一些区域具有根据第二协议操作的目的地。 另外，每个区域至少有一个位于其中的路由器。 每个区域中的目的地的位置被识别到该区域中的路由器。 识别每个区域中目的地的位置的信息被传送到每个其他区域中的路由器，而不管目的地是否位于与路由器相同的区域中。 最后，根据第二协议格式化的信息在任何目的地之间传送。