A certification path is an ordered list of certificates starting with a certificate issued by the relying
party s trust root, and ending with the target certificate that needs to be validated. Certification
path validation procedures are based on the algorithm supplied in ITU-T Recommendation X.509
and further defined in Internet Engineering Task Force (IETF) Request for Comments (RFC)
3280. Certification path processing verifies the binding between the subject distinguished name
and/or subject alternative name and the subject public key defined in the target certificate. The
binding is limited by constraints, which are specified in the certificates that comprise the path,
and inputs that are specified by the relying party. To ensure secure interoperation of PKI-enabled
applications, the path validation must be done in accordance with the X.509 and RFC 3280
specifications. This document provides the test assertions and the test cases for testing path
validation software against these specifications.
The 4.0 kbit/s speech codec described in this paper is based on a
Frequency Domain Interpolative (FDI) coding technique, which
belongs to the class of prototype waveform Interpolation (PWI)
coding techniques. The codec also has an integrated voice
activity detector (VAD) and a noise reduction capability. The
input signal is subjected to LPC analysis and the prediction
residual is separated into a slowly evolving waveform (SEW) and
a rapidly evolving waveform (REW) components. The SEW
magnitude component is quantized using a hierarchical
predictive vector quantization approach. The REW magnitude is
quantized using a gain and a sub-band based shape. SEW and
REW phases are derived at the decoder using a phase model,
based on a transmitted measure of voice periodicity. The spectral
(LSP) parameters are quantized using a combination of scalar
and vector quantizers. The 4.0 kbits/s coder has an algorithmic
delay of 60 ms and an estimated floating point complexity of
21.5 MIPS. The performance of this coder has been evaluated
using in-house MOS tests under various conditions such as
background noise. channel errors, self-tandem. and DTX mode
of operation, and has been shown to be statistically equivalent to
ITU-T (3.729 8 kbps codec across all conditions tested.
HUAWEI MH5000-31 5G模塊AT命令手冊，用于開發(fā)華為MH5000-31模塊使用。本文根據(jù)終端設(shè)備的需求，實現(xiàn)了國際標(biāo)準(zhǔn)（如 3GPP 和 ITU-T）中的部分 AT 命
令。本文還描述了終端設(shè)備實現(xiàn)的私有 AT 命令接口，私有 AT 命令接口是為了更好
或更方便地實現(xiàn)某種功能。
本文不描述標(biāo)準(zhǔn)已經(jīng)定義或 MT 已實現(xiàn)，但華為終端產(chǎn)品需求涉及不到的接口。對于
AT 命令接口的描述，僅限于接口數(shù)據(jù)包本身，以及 TE 和 MT 對接口的使用方法和
使用流程，不包括與接口不直接相關(guān)的內(nèi)容。本文也僅限于描述 TE 和 MT 之間 Rm
接口范圍內(nèi)的 AT 命令接口，而不描述 MT 與 IWF 之間 Um 接口范圍內(nèi)的 AT 命
令接口。
AT 命令是 TE 和 MT 之間的通信命令協(xié)議。如果有新款 MT 產(chǎn)品需要和現(xiàn)有 TE
對接，而現(xiàn)有 TE 是按照本 AT 規(guī)范實現(xiàn)的，則新款 MT 必須遵守此規(guī)范才能保證
兩者成功對接。比如新款模塊和現(xiàn)有 PC 統(tǒng)一后臺對接，那么新款模塊必須遵守此規(guī)
范；反之亦然，比如新開發(fā)某 PC 后臺或 PC 工具，也要遵守此規(guī)范，才能和現(xiàn)有的
終端產(chǎn)品對接。若 TE 和 MT 不用 AT 命令通信，則不受本規(guī)范限制。
