M34 微波通信设备 标准查询与下载

ITU-T G.737-1988 工作在2048kbit/s并提供384kbit/s和/或64kbit/s同步数字接入的外部接入设备的特性

The timing signal for the insertion side should be derived from the 2048 kbit/s incoming signal at the insertion side (Io): the timing signal for the extraction side should be derived from the 2048 kbit/s incoming signal at the extraction side (EI)

Characteristics of an External Access Equipment Operating at 2048 kbit/s Offering Synchronous Digital Access at 384 kbit/s and/or 64 kbit/s - General Aspects of Digital Transmission Systems; Terminal Equipments (Study Groups XV and XVIII) 7 pp

ITU-T G.738-1988 工作在2048kbit/s并提供384kbit/s和/或64kbit/s同步数字接入的外部接入设备的特性

The synchronous insertion of a digital sound-programme signal into a 320 kbit/s channel requires the internal regeneration of a timing signal T synchronized by the 2048 kbit/s signal Il. The timing signal is used for synchronizing the sampling frequency

Characteristics of Primary PCM Multiplex Equipment Operating at 2048 kbit/s and Offering Synchronous Digital Access at 320 kbit/s and/or 64 kbit/s - General Aspects of Digital Transmission Systems; Terminal Equipments (Study Groups XV and XVIII) 8 pp

ITU-T G.739-1988 工作在2048kbit/s并提供320kbit/s和/或64kbit/s同步数字接入的外部接入设备的特性

The timing signal for the insertion side should be derived from the 2048 kbit/s incoming signal at the insertion side (Io); the timing signal for the extraction side should be derived from the 2048 kbit/s incoming signal at the extraction side (El).

Characteristics of an External Access Equipment Operating at 2048 kbit/s Offering Synchronous Digital Access at 320 kbit/s - General Aspects of Digital Transmission Systems; Terminal Equipments Study Groups XV and XVIII; 7 pp

ITU-T G.733-1988 工作在1544 kbit/s的基群脉冲编码调制(PCM)复用设备的特性.数字传输系统的一般影响.终端设备(研究组XV和XVIII)

1.1 Fundamental characteristics The encoding law used is the p-law as specified in Recommendation G.711. The sampling rate, load The number of quantized values is 255. Two character signals are reserved for zero value (11111111 In some networks the all-O character signal (00000000) is eliminated to avoid loss of timing information to capacity and the code are also specified in that Recommendation. and 01111111). the digital line, resulting in 254 quantized values. 1.2 Bit rate The nominal bit rate is 1544 kbit/s. The tolerance on this rate is f 50 parts per million (ppm). 1.3 Timing signal It should be possible to derive the transmitting timing signal of a PCM multiplex equipment from an internal source, from the incoming digital signal and also from an external source.

Characteristics of Primary PCM Multiplex Equipment Operating at 1544 kbit/s - General Aspects of Digital Transmission Systems; Terminal Equipments (Study Groups XV and XVIII) 4 pp

ITU-T G.732-1988 工作在2048 kbit/s的基群脉冲编码调制(PCM)复用设备的特性.数字传输系统的一般影响.终端设备(研究组XV和XVIII)

1.1 Fundamental characteristics The encoding law used is the A-law as specified in Recommendation G,711. The sampling rate, load capacity and the code are also specified in that Recommendation. The number of quantized values is 256. Note -The inversion of bits 2, 4, 6, and 8 is covered by the encoding law and is applicable only to voice-channel time slots. 1.2 Bit rate The nominal bit rate is 2048 kbit/s. The tolerance on this rate is f 50 parts per million (ppm). 1.3 Timing signal It should be possible to derive the transmitting timing signal of a PCM multiplex equipment from an Note - Further study is required on the effect of jitter of the incoming signal on the timing signal, and internal source, from the incoming digital signal and also from an external source. on the measures to be taken in case of loss of the incoming signal or the external source.

Characteristics of Primary PCM Multiplex Equipment Operating at 2048 kbit/s - General Aspects of Digital Transmission Systems; Terminal Equipments (Study Groups XV and XVIII) 7 pp

ITU-T G.735-1988 工作在2048 kbit/s并提供384 kbit/s和/或64 kbit/s同步数字接入的基群脉冲

This detection is not mandatory when contradirectional interfaces are used.

Characteristics of Primary PCM Multiplex Equipment Operating at 2048 kbit/s and Offering Synchronous Digital Access at 384 kbit/s and/or 64 kbit/s - General Aspects of Digital Transmission Systems; Terminal Equipments (Study Groups XV and XVIII) 8 pp

ITU-T G.734-1988 工作在1544kbit/s的同步数字复用设备的特性

The encoding law used is the A-law as specified in Recommendation G.711. The sampling rate, load The number of quantized values is 256.

Characteristics of Synchronous Digital Multiplex Equipment Operating at 1544 kbit/s - General Aspects of Digital Transmission Systems; Terminal Equipments (Study Groups XV and XVIII) 4 pp

SJ 2325-1983 陆用微波通信设备环境试验条件及试验方法(暂行)

Environmental test conditions and test procedures for land microwave communication equipment

SJ 20623-1997 军用5GHz数字微波接力机通用规范

本规范规定了军用5GHz数字微波接力机的分类、要求、质量保证规定、交货准备等。 本规范适用于频率5650～5930MHz，传输容量为2.048，8.448，34.368Mbit/s的军用5GHz数字微波接力机设计、制造、检验和验收。

General specification for military 5GHz digital microwave relay equipment