Function
The DDF performs the following functions:
l
Transfers signals through the trunk cables between the communication devices and the
transmission devices.
l
Transfers signals through the alarm cables between the communication devices and the
external alarm devices.
Feature
The DDF has the following features:
l
Provides wall-mounting pieces and supporting the installations in a 19-inch cabinet and on
a wall.
l
Transfers 16 alarm signals and eight E1s with each E1 grounded.
l
Supports wire punching from the front.
Technical Specification
describes the technical specifications of the DDF.
Table 6-2
Technical specifications of the DDF
Item
Specification
Dimensions (height x width x depth)
44 mm x 483 mm x 59 mm
Weight
1 kg
Working rate
2 Mbit/s
Characteristic impedance
120 ohms
Inter-wire-bundle cross noise prevention
class
≥
60 dB
Insertion loss
≤
0.4 dB
Return loss
≥
18 dB
6 BTS3900 Auxiliary Equipment
BTS3900
Hardware Description
6-4
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Issue 04 (2011-02-15)