Table 5-28 Specifications of the interfaces on the AND3ML1A/AND3ML1B
Item Specification Requirement
Nominal bit rate (kbit/s) 2048
Interface impedance 75 ohms (ML1A)
120 ohms (ML1B)
Interface code HDB3
Pulse waveform at the output interface Complies with ITU-T G.703
Attenuation tolerance of the input interface at
the point with a frequency of 1024 kHz (dB)
0 to 6
Anti-interference capability of the input
interface
Complies with ITU-T G.703
Input jitter tolerance Complies with ITU-T G.823
Output jitter Complies with ITU-T G.823
Physical Specifications
Board dimensions (mm): 20.32 (H) x 225.75 (D) x 193.80 (W)(0.80 in.×8.89 in.×7.63 in.)
Weight (kg): 0.44(0.97 lb)
Power consumption (W, room temperature): 9.5
5.8 AND2MD1A/AND2MD1B - 32 Channels E1 Interface
Board
This section describes the AND2MD1A/AND2MD1B, a 32 channels E1 electrical interface
board, in terms of the overview, functions, features, working principle, front panel, and technical
specifications.
NOTE
The mapping impedance of an interface on the AND2MD1A is 75 ohm, and the mapping impedance of an
interface on the AND2MD1B is 120 ohm. Except the difference of mapping impedance, the functions and
features of the AND2MD1A and AND2MD1B are the same.
5.8.1 Overview
The AND2MD1A/AND2MD1B (MD1A/MD1B for short) is a 32 channels E1 interface board.
The function version of the MD1A/MD1B is AND1. The AND2MD1A/AND2MD1B is housed
in any of slots 1 to 6.
5.8.2 Functions and Features
The AND2MD1A/AND2MD1B is an E1 interface board. The AND2MD1A/AND2MD1B must
be used with the system control board to access and process 32 channels of E1 services. Services
ATN 950B Multi-service Access Equipment
Hardware Description 5 Physical Interface Card
Issue 03 (2012-07-23) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
74
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