A reference for Designing Servers and Peripherals for the Microsoft® Windows® 2000 Server Family of Operating Systems Intel Corporation and Microsoft Corporation Publication Date—June 30, 2000
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- 111. ATM adapter meets network adapter requirements
- 113. ATM adapter supports all service types defined by the ATM Forum
- 114. ATM adapter supports UBR service type
- 115. ATM adapter supports a minimum number of simultaneously active VBR or CBR connections
- 116. ATM adapter supports traffic shaping
- 117. ATM adapter enforces PCR on UBR virtual circuits
- 118. ATM adapter and driver support dynamic link speed configuration
- 119. ATM adapter supports OAM
- 120. ATM adapter supports buffer chaining (Tx + Rx)
ATM Adapter RequirementsThis section summarizes requirements for ATM hardware. The NDIS 5.0 extensions provide kernel-mode NDIS 5.0 client drivers with direct access to connection-oriented media such as ATM. The architecture for Windows 2000 extends native ATM support to Winsock 2.0, TAPI, and applications based on Microsoft DirectShow® by providing system-level components that map the applicable Winsock, TAPI, and DirectShow APIs to NDIS 5.0, extending direct ATM access to user-mode applications. ATM is not required for any of the server classes. If an ATM adapter is designed for operation under Windows 2000 in the server system, it must meet the requirements defined in this section. For more details about the following requirements, see “ATM Layer Specification” in ATM User-Network Interface Specification, Version 3.1. This specification also includes references to other relevant specifications.
ATM adapters must meet all requirements listed in “Network Adapter Requirements” earlier in this guide. 112. ATM adapter supports a minimum number of simultaneous connectionsRequired The Virtual Path Identifier (VPI) and Virtual Channel Identifier (VCI) ranges supported by the adapter affect the maximum number of simultaneous connections supported on a system. This affects the applicability of the adapter to ATM applications such as LAN Emulation, where at least one dedicated virtual channel is created between each pair of communicating ATM hosts.
A sample driver is provided in the Windows 2000 DDK to guide developers in properly supporting resources to meet this requirement. 113. ATM adapter supports all service types defined by the ATM Forum
The ATM adapter should support the constant bit rate (CBR), variable bit rate (VBR), available bit rate (ABR), and unspecified bit rate (UBR) service types as defined by the ATM Forum. 114. ATM adapter supports UBR service typeRequired UBR is used by default for standard ATM services such as LAN Emulation and IP over ATM. In addition, Point-to-Point Protocol (PPP) is a widely used model for residential network access and UBR is used by default for PPP over ATM virtual circuits. Therefore, it is required that ATM adapters support the UBR service type. 115. ATM adapter supports a minimum number of simultaneously active VBR or CBR connectionsRequired Support for at least two simultaneously active VBR or CBR connections is required for basic ATM signaling and management. Support for additional VBR/CBR connections is needed for ATM adapters that support multimedia or other traffic that demands QoS. These are listed in the following table.
116. ATM adapter supports traffic shapingRequired The ATM adapter must support and enforce all the traffic-shaping rules specified for each service type it supports, including CBR, VBR, ABR, and UBR. Note: This includes enforcement of peak cell rate on UBR virtual circuits. 117. ATM adapter enforces PCR on UBR virtual circuitsRequired ATM adapters will be used to connect router, remote access, and content servers to the public ATM network. High-speed residential broadband access networks such as ADSL and cable modem will use an ATM virtual circuit from home or small office computers to connect directly to these servers. When the Windows Dial-Up Networking UI is used to connect from a home or small business computer to a remote router or server, a PPP link is established over an ATM virtual circuit. The service type used on this PPP-over-ATM virtual circuit is UBR. When creating the UBR virtual circuit, Windows requests upstream and downstream line rates, or Peak Cell Rates (PCR), equal to the upstream and downstream line rates provisioned for the user. Windows uses the ATM Interim Local Management Interface (ILMI) protocol to obtain information, such as getting the user’s provisioned line rates from the public network. To avoid packet loss and ensure efficient network utilization, it is critical that all ATM, integrated ATM/ADSL adapters, and ATM/cable modem adapters enforce requested PCR on UBR virtual circuits. Because any ATM adapter might be installed in a server to which clients connect through the public network, this requirement applies to all ATM adapters.
When connected to a residential broadband network, ATM adapters must restrict the aggregate transmission rate across all active virtual circuits so that it does not exceed the provisioned upstream bandwidth of the residential broadband network. All integrated ATM/ADSL and ATM/cable modem adapters must support aggregate shaping of upstream bandwidth according to the provisioned upstream bandwidth or the trained bandwidth, whichever is lower. Some implementations can support rate adaptation, and lower-than-provisioned rates may be negotiated due to poor line conditions. All 25-Mbps ATM adapters must support this as well, because any 25-Mbps ATM adapter could be used to connect by way of an external ADSL modem to an ADSL network. This support is optional for ATM adapters with line rates higher than 25 Mbps. The Windows ATM Call Manager uses ILMI to query the public network to discover the provisioned maximum line rates for incoming and outgoing traffic. The Call Manager then uses the OID_GEN_CO_LINK_SPEED NDIS request (in SET mode) to set the line rate for both incoming and outgoing traffic. The adapter must shape the aggregate of ATM traffic within these incoming and outgoing rates. 119. ATM adapter supports OAMRequired Operation and maintenance (OAM) is needed for diagnostics. This capability is required for a server system. At minimum, the ATM adapter must respond to received F4 and F5 loopback OAM cells. Support for other layers, F1–F3 is optional. 120. ATM adapter supports buffer chaining (Tx + Rx)Required This feature is needed for large packets. This capability is required for server systems, but is recommended for client systems. Directory: download download -> Performance Tuning Guidelines for Windows Server 2008 May 20, 2009 Abstract download -> Northern England’s set-jetting locations download -> Bbc archives: Beyond the programme download download -> Occupational health and safety download -> Dynatest 3031 lwd light Weight Deflectometer download -> Forth coming competitive exams download -> English Olympiad Tasks: 10 th form Аудіювання, 10 клас. Текст download -> Brush High School Morning Announcements Friday, September 05, 2014 all school download -> Year 9 The Arts — Music download -> Years 7 and 8 standard elaborations — Australian Curriculum: Music draft Download 1.64 Mb. Share with your friends:
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