Selection and Testing of Electronic Components for LM

124
References
1. Lindquist, S. and Widl, W.: 30-
Channel PCM Terminal Equipment
in the M5 Construction Practice.
Ericsson Rev. 53 (1976):1, pp.
38-49.
2. Arras, J. and Tarle, H.: PCM Line
Equipment ZAD 2. Ericsson Rev.
49(1972):2, pp. 47-55.
3. Fredricsson, S.: Transmission Properties
of Paper-Insulated Twin
Cables at High Frequencies. Ericsson
Rev. 54 (1977):1, pp. 28-31.
4. Axelson, K., Harris, P.-O. and Storesund,
E.: M5 Construction Practice
for Transmission Equipment.
Ericsson Rev. 52 (1975):3/4, pp.
94-105.
and the possibilities offered by construction
practice M5, component development
etc. The two systems have
much in common. The use of the same
housing admits common equipping
and facilitates future conversion. ZAD
8-2 has several unique characteristics,
for example the possibility of using
both polythene and existing paper-insulated
cables, and a fault location
Technical data
Electrical data
Line signal
Bit rate/symbol rate
Code
Impedance
Pulse amplitude
Intermediate repeater
Equalization range
Power consumption per oneway
repeater, max.
Temperature range
Power supply
Primary current source
Feeding of intermediate
repeaters
Nominal regulated current
Output voltage, max
Mechanical data
Terminal repeater station
Shelf dimensions
Capacity per line terminating
shelf
Bay height
Capacity per bay
Intermediate repeater station
Dimensions hxwxl or hx®
Weight
Number of two-way 2 Mbit/s
repeaters or one-way 8 Mbit/s
repeaters (incl. fault location
and speaker circuit
equipment)
ZAD2-3
D1 interface S1 interface
2.048 Mb/s 2.048 Mbaud
Bipolar HDB-3 or AMI
75Q unbal 120L> bal.
±2.37 V
+ 3.0 V
5-35 dBat 1 MHz
8 2 V/48 mA
-40°Cto + 70"C
ZDD 532
310*280x430 mm
40 kg
8
system that permits measurements during
operation. Compared with the previous
generation of 2 Mbit/s line systems
ZAD 2-3 has lower power consumption
per repeater, i.e. larger power
feeding distance, better lightning protection
and a more advanced alarm system.
Furthermore the volume of the terminal
equipment is only half that of the
previous generation.
ZAD 8-2
D2 interface S2 interface
8.448 Mb/s 8.448 Mbaud
Bipolar HDB-3 or AMI
75Q unbal. 150Q bal
±2.37 V + 3.3 V
40-65 dB strappable
25-50 dBat 4.2 MHz
15.5 V/48 mA
-40'Cto + 70"C
Battery 24. 36, 48, 60 V
Rectifier tor 110, 127, 220 V (45-65 Hz)
Series feeding via the phantom circuit
48 mA DC
±106 V bal.
122x225-473 mm
ZAD 2-3: 4 systems
ZAD 8-2: 2 systems
Max. 2743 mm
ZAD 2-3: 64 systems
ZAD 8-2: 36 systems
ZDD 533
700x510 mm
110 kg
8
ZDD 534
320x480x610 mm
80 kg
23
ZDD 535
280x195 mm
10 kg
1 (2 Mbit/s)