Digicom LCM16P Manuale utente
LCM16P
LCM16PR
USER'S MANUAL
II
III
LCM16P
LCM16PR
USER'S MANUAL
LCM16P LCM16PR rev.2.0 07/97 COD.7D0894
All right reserved; no part of this publication may be reproduced, stored in a retrieval system,
or trasmitted in any form or by any means, electronic, otherwise, without the prior written
permission of the publishers.
The contents of this booklet may be modified without prior permission.
Every possible care has been taken in testing and putting together all the documentation
contained in this booklet, however DIGICOM can not take any responsibility brought by
the use of this booklet.
IV
INDEX
PRECAUTIONS
1. INTRODUCTION 1.1
1.1. PRODUCT FEATURES 1.1
1.2. TECHNICALCHARACTERISTICS 1.1
1.2.1. DTE-DCE digital interface 1.1
1.2.2. Data input 1.2
1.2.3. Clock signal characteristics 1.4
1.2.3. RTS/ CTS circuits 1.4
1.2.4. Asynchronous Mode 1.5
1.2.5. Analog Interface: transmission line 1.5
1.2.6. Analog Interface: receive line 1.5
1.2.7. Receive time base (synchronous mode only) 1.6
1.2.8. C109 Circuit 1.6
1.2.9. Tests 1.7
1.2.10. Connection distance 1.7
1.2.11. Line connection 1.8
1.2.12. DTE connection 1.8
1.3. FUNCTIONAL BLOCK DIAGRAM 1.8
1.3.1. Datapump 1.8
1.3.2. Microprocessor 1.8
1.3.3. Line Interface 1.9
1.3.4. RS 232 Interface 1.9
1.3.5. Power supply circuit 1.9
1.3.6. Loop circuits 1.9
1.4. TRANSMISSION CIRCUIT 1.11
1.4.1. Digital section 1.11
1.4.2. Analog section 1.12
1.5. RECEIVER CIRCUIT 1.13
1.5.1. Analog section 1.13
1.5.2. Digital section 1.13
1.6. POWER SUPPLY 1.14
1.7. CCITT V54 RECOMMENDATION 1.14
2. THIS CHAPTER IS INTENTIONALLY BLANK 2.1
3. OPERATION MODE 3.1
3.1. DEVELOPMENT AND ACCESSORY 3.1
3.1.1. Technical characteristics 3.1
3.1.1.1. Mechanical Size 3.1
3.1.1.3. Power supply 3.2
3.2. COMMAND AND MESSAGE DEVICES 3.2
3.3. INSTALLATION PROCEDURE 3.4
LCM16P LCM16PR Index
V
3.3.1. Preliminary Operations 3.4
3.3.2. Modem installation 3.4
3.3.3. Electrical connections 3.4
3.3.3.1. Main power supply connection 3.4
3.3.3.2. Line connection 3.5
3.3.3.3. DTE interface 3.5
3.4. LCM16P AND LCM16PR PREDISPOSITION 3.5
3.4.1. Functional Description 3.6
3.4.2. Jumpers functional description 3.12
4. DIAGNOSTIC 4.1
4.1. INTRODUCTION 4.1
4.2. LOOP 3 ACTIVATION 4.1
4.3. LOCAL LOOP 2 ACTIVATION 4.2
4.4. REMOTE LOOP 2 ACTIVATION 4.2
4.5. TANDEM CONFIGURATION EXAMPLE 4.4
4.6. TEST DURING LOOP 4.5
DECLARATION OF CONFORMITY
TABLES INDEX
Tab.: 1.1. CCITT V24 INTERFACE SIGNALS USED IN LCM16P AND
LCM16/PR MODEMS 1.3
Tab.: 1.2. DELAY TIMES RTS/CTS 1.4
Tab.: 1.3. DCD DELAY TIME. 1.6
Tab.: 1.4. CONNECTION DISTANCE WITHOUT THE EQUALIZER 1.7
Tab.: 1.5. CONNECTION DISTANCES WITH EQUALIZER 1.7
PICTURES INDEX
Fig.: 1.1. FUNCTIONAL BLOCK DIAGRAM 1.10
Fig.: 1.2. MODULATION WAVEFORMS 1.11
Fig.: 1.3. BLOCK DIAGRAM 1.16
Fig.: 3.1. LCM16P FRONTAL VIEW 3.3
Fig.: 3.2. LCM16P BACK VIEW 3.3
Fig.: 3.3. LCM16PR FRONTAL VIEW 3.4
Fig.: 3.4. LINE CONNECTOR AND PINS ASSIGNMENT FOR LCM16P 3.5
Fig.: 3.5 LINE CONNECTOR AND PINS ASSIGNMENTS FOR LCM16PR 3.5
Fig.: 3.6. LCM16P TOPOGRAPHICAL VIEW 3.14
Fig.: 3.7. LCM16PR TOPOGRAPHICAL VIEW 3.15
Fig.: 4.1. LOOP 3 DIAGRAM 4.1
Fig.: 4.2. LOCAL LOOP2 DIAGRAM 4.2
Fig.: 4.3. REMOTE LOOP 2 DIAGRAM 4.3
Fig.: 4.4. TANDEM CONNECTION + MULTI- POINT 4.4
LCM16P LCM16PR Index
VI
LCM16P LCM16PR ENGLISH Index
PRECAUTIONS
The following installation rules should be respected in order to have the best working order of the
equipment an user’s safety.
Enviromental Conditions
Forall devices:
ENVIROMENTAL RELATIVE
TEMPERATURE HUMIDITY
from -5 to + 45°C from 20 to80% n.c.
Avoid rapid changes of temperature and humidity (0,03°C/ [min.]).
This system, including cables, should be installed in an area without or distant from:
lDust, humidity, elevated heat from direct sun light.
lObjects irradiating heat. These could cause damages to the container or other problems.
lObjects that cause a strong electromagnetic field. (HI-FI loudspeakers, Etc.).
lLiquids or chemical corrosive substances.
GENERALWARNINGSForallequipmentpowereddirectlyfromthenetwork
POWER SUPPLY 230 Volt 50Hz
ISOLATION CLASS only those indicated on the equipments label
NOMINAL CURRENTS only those indicated on the equipments label
To avoid electric shocks, the equipment should never be opened. Ask qualified personnel help.
To replace the fuse, remove the power supply cable.
Disconnect the power cable from the wall plug when the terminal is not used for a long period.
To disconnect the cable, pull it by the plug, never pull it by the cable itself.
If there should be a liquid or objet penetration in the equipment, disconnect the power cable and call the
qualified personnel for testing.
CLEANINGTHETERMINAL
Use a soft dry cloth. Wet the cloth with water or natural detergent if it is necessary to remove stains.
Never use chemical product such as petrol or solvents.
VIBRATIONS OR CRASHES Caution against vibrations and crashes.
WARNING
This is a class A product.
In a domestic environment this product may cause radio interference
in which case the user may be required to take adeguate measures.
SEDE LEGALE, DIREZIONE ed UFFICI
REGISTERED AND HEAD OFFICE
ITALY - 21010 Cardano al Campo VA
Via Alessandro Volta 39
Tel. 0331/702611 - Fax 0331/263733
Tel. +39/331/702611 - Fax +39/331/263733
http://www.digicom.it
ROMA
00194 Roma Via Dei Colli Della Farnesina 72
Tel. 06/36300015 - Fax 06/3293695
Tel. +39/6/36300015 - Fax +39/6/3293695
BOLOGNA
40122 Bologna Via Lame 116
Tel. e Fax 051/ 558709
Tel. and Fax +39/51/558140
TORINO
10129 Torino C.so De Gasperi 26
Tel. 011/504802 Fax 011/504627
Tel. +39/11/504802 Fax +39/11/504627
PADOVA
35030 Rubano PD Via Della Provvidenza 37
Tel. 049/8976528 Fax 049/8976524
Tel. +39/49/8976528 Fax +39/49/8976524
HOT LINE
Tel. 0331/261649 Fax 0331/730800
Tel. +39/331/261649 Fax +39/331/730800
1.1
LCM16P/LCM16PR Introduction
Digicom SpA
1. INTRODUCTION
1.1. PRODUCT FEATURES
The digicom LCM16P is a baseband modem in table top or rack version.
It is possible to use LCM16 modem in systems of dedicated point to point,
multiple point and tandem two or four wire lines.
The line must have metallic continuity.
Do not insert channel amplifiers on the line.
Isitpossible toactivateremote digitalloop(Loop 2 “RDL”)andremote loop
3 for tandem configuration in accordance with CCITT V.54 standard.
It supports both asynchronous and synchronous communication modes.
DTE interface speed is from 225 up to 19200 bit/s, with a set of intermediate
speeds for the asynchronous mode.
Modulation and demodulation, synchronous to asynchronous conversion,
interfacesignaldelay,loopsandtime-outsareimplementedbyanewintegrated
ASIC circuit.
The LCM16P was designed in accordance with the Telecommunication
standard Nr. 687.
The modemrespects the normativeEN60950, EN41003 (safety standards)
and EN55022 EN50082-1 (electromagnetic compatibility standards). It
complies with V.24, V.28, and V54 CCITT recommendations and with
ISO2110 standard.
1.2. TECHNICAL CHARACTERISTICS
1.2.1. DTE-DCE digital interface
DTE(DataTerminalEquipment)isthedevice inwhichdata aregeneratedand used.
DCE (Data Circuit Terminating Equipment) is the device in which data are
converted from digital to analog and vice versa.
DTE-DCE interface data signal table
CCITT V28 signal level -3 ÷ -25 V; +3 ÷ +25 V
Binarydenomination BIT 1; BIT 0
Data type MARK (MK); SPACE (SP)
Asynchronousbit STOP (Z); START (A)
Control signal state PAUSE (OFF); WORK (ON)
1.2
LCM16P/LCM16PR Introduction
Digicom SpA
1.2.2. Data input
Synchronous mode operation speed
19200, 14400, 9600, 7200, 4800, 3600, 2400,
1800, 1200, 900, 600, 450, 300, 225 bit/s. It is
possible to change speed by the internal dip
switches.
Asynchronous mode operation speed
19200, 14400, 9600, 7200, 4800, 3600, 2400,
1800, 1200, 900, 600, 450, 300, 225 bit/s, with
extension to the following speeds:
Predisposition Minimumvalue Maximum value
300 292,5 (297,5) 301 (305,25)
600 585 (595) 602 (610,5)
1200 1170 (1190) 1204 (1221)
2400 2340 (2380) 2408 (2442)
4800 4680 (4760) 4816 (4884)
9600 9360 (9520) 9632 (9768)
19200 18720 (19040) 19264 (19536)
(Between parenthesis the extension value)
Type of characters no limit; the modem is transparent to the data
comingthrough.
Interface connector 25 leads female cannon with contacts in
accordance with ISO 2110 standard and CCITT
V24 recommendation.
1.3
LCM16P/LCM16PR Introduction
Digicom SpA
Cont. Circuit Direction Mnem. Description
Conn. V24 RS232 DTE-LCM16 Abbrev.
1 - AA <----> PG Earth protection
2 103 BA -----> TD Transmission data
3 104 BB <----- RD Received data
4 105 CA -----> RTS Request to send
5 106 CB <----- CTS Clear to send
6 107 CC <----- DSR Data set Ready
7 102 AB <----> SG Ground
8 109 CF <----- DCD Data carrier detect
9 - - <----- - + 12 volt
10 - - <----- - - 12 volt
11
12
13
14
15 114 dB <----- TC Transmission Clock
16
17 115 DD <----- RC Receiver Clock
18 141 CN -----> L3 Local analog loopback
application(CCITTLOOP3)
19
20 108.2 CD -----> DTR Data terminal ready
21 140 CF -----> RDL Local digital loopback
application (CCITT LOOP
2LOCAL)
22 125 CE <----- - 12 volt
23
24 113 From -----> ETC External transmission clock
25 142 - <----- TI Active Loop
NOTE: 1, 11, 12, 13, 14, 16, 19, 23 pins are not connected.
Tab.: 1.1. CCITT V24 INTERFACE SIGNALS USED IN LCM16P AND
LCM16/PR MODEMS
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