DIGICOM SPA

LCM16P

Card Type Modem (synchronous/asynchronous)
Chip Set Unidentified
I/O Options RJ-11 connector, DB-25 pin connector
Maximum Modem Rate 19.2Kbps
Data Modulation Protocol ITU-T V.1, V.24, V.28, V.54
Data Bus External


CONNECTIONS

Function

Label

Function

Label

DB-25 pin connector CN1 RJ-11 connector CN2


USER CONFIGURABLE SETTINGS

Function

Label

Position

 

 Select V.54 recognition of a 256 contiguous bit sequence DSA/8 Off
  Select V.54 recognition of a 128 contiguous bit sequence DSA/8 On
  Select V.54 loopback 2 to end 20 minutes after activation DSB/6 Off
  Select V.54 loopback 2 to end 5 minutes after activation DSB/6 On
  C140 signal disabled DSB/7 Off
  C140 signal enabled DSB/7 On
  C141 signal disabled DSB/8 Off
  C141 signal enabled DSB/8 On
  Asynchronous mode selected DSC/3 Off
  Synchronous mode selected DSC/3 On
  Extended range of frequency enabled in asynchronous mode DSC/4 Off
  Normal range of frequency enabled in asynchronous mode DSC/4 On
  V.1 modulation selected DSD/4 Off
  Inverted V.1 modulation selected DSD/4 On
  Fast carrier detect enabled DSD/5 On
  Fast carrier detect disabled DSD/5 Off
  C105 transmission impedance fixed (ohm level set by U13) DSD/6 Off
  C105 transmission impedance controlled by C105 signal DSD/6 On
  C105 line carrier is fixed DSD/7 Off
  C105 line carrier controlled by C105 signal DSD/7 On
  Front panel buttons disabled DSE/1 Off
  Front panel buttons enabled DSE/1 On
  Time-out function disabled DSE/2 Off
  Time-out function enabled DSE/2 On
  Time-out duration select 64000 bit-time (6.5 seconds at 9600bps) DSE/3 Off
  Time-out duration select 128000 bit-time (13 seconds at 9600bps) DSE/3 On
  C108 signal controlled by DTE DSE/4 Off
  C108 signal always on DSE/4 On
  Line speed equalizer select 19200 to 2400bps U3 Pins 1 & 2 closed
  Line speed equalizer select 1200bps U3 Pins 2 & 3 closed
  Low transmission line impedance while modem is off U6 Pins 1 & 2 closed
  High transmission line impedance while modem is off U6 Pins 2 & 3 closed
  Receive impedance select 150/600 ohm U13 Pins 1 & 2 closed
  Receive impedance select always high U13 Pins 2 & 3 closed
  Receiving signal level of -30dBm turns carrier detector on U16 Pins 1 & 2 closed
  Receiving signal level of -40dBm turns carrier detector on U16 Pins 2 & 3 closed


TRANSMISSION LEVEL

Setting

U4

-12 dBm

Pins 1 & 8 closed
-6 dBm Pins 2 & 7 closed
0 dBm Pins 3 & 6 closed
+6 dBm Pins 4 & 5 closed


LEASED LINE SELECTION

Setting

DSD/8

U7

2 wire leased line

On

Pins 1 & 2 closed
4 wire leased line Off Pins 2 & 3 closed


EQUALIZER CONTROL

Setting

 U9

Enabled in transmission

 Pins 1 & 2 closed
Enabled in the receive circuit Pins 2 & 3 closed
Disabled Pins 3 & 4 closed


TRANSMISSION IMPEDANCE SELECTION

Size

U2 U8 U12 U15

150 ohm

 Pins 2 & 3 closed Pins 2 & 3 closed Pins 2 & 3 closed Pins 2 & 3 closed

600 ohm

 Pins 1 & 2 closed Pins 1 & 2 closed Pins 1 & 2 closed Pins 1 & 2 closed


LOOP 2R ACTIVATION ADDRESS

Setting

DSA/1

DSA/2

DSA/3

DSA/4

DSA/5

01h

 Off Off Off Off Off

03h

  On Off Off Off Off

05h

 Off On Off Off Off

07h

 On On Off Off Off

09h

 Off Off On Off Off

0Bh

 On Off On Off Off

0Dh

 Off On On Off Off
0Fh On On On Off Off
11h Off Off Off On Off
13h On Off Off On Off
15h Off On Off On Off
17h On On Off On Off
19h Off Off On On Off
1Bh On Off On On Off
1Dh Off On On On Off
1Fh On On On On Off
25h Off Off Off Off On
27h On Off Off Off On
2Bh Off On Off Off On
2Dh On On Off Off On
2Fh Off Off On Off On
33h On Off On Off On
35h Off On On Off On
37h On On On Off On
3Bh Off Off Off On On
3Dh On Off Off On On
3Fh Off On Off On On
55h On On Off On On
57h Off Off On On On
5Bh On Off On On On
5Fh Off On On On On
6Fh On On On On On


LOOP 2R RECEIVER ACTIVATION ADDRESS

Setting

DSB/1

DSB/2

DSB/3

DSB/4

DSB/5

01h

 Off Off Off Off Off

03h

  On Off Off Off Off

05h

 Off On Off Off Off

07h

 On On Off Off Off

09h

 Off Off On Off Off

0Bh

 On Off On Off Off

0Dh

 Off On On Off Off
0Fh On On On Off Off
11h Off Off Off On Off
13h On Off Off On Off
15h Off On Off On Off
17h On On Off On Off
19h Off Off On On Off
1Bh On Off On On Off
1Dh Off On On On Off
1Fh On On On On Off
25h Off Off Off Off On
27h On Off Off Off On
2Bh Off On Off Off On
2Dh On On Off Off On
2Fh Off Off On Off On
33h On Off On Off On
35h Off On On Off On
37h On On On Off On
3Bh Off Off Off On On
3Dh On Off Off On On
3Fh Off On Off On On
55h On On Off On On
57h Off Off On On On
5Bh On Off On On On
5Fh Off On On On On
6Fh On On On On On


FRONT PANEL BUTTON FUNCTIONS

Button

 Function

P1

 LOOP 3 - Enables local line loop on modem.  Enables local modem correct function.  No data is transmitted or received.

P2

 LOOP 2 - Enables local interface loopback.
P3 LOOP 2R - Enables interface loopback on remote modem - multi-point and tandem configurations.
P4 Enables test pattern while modem is in LOOP 3 or LOOP 2R.


DIAGNOSTIC LED(S)

LED

Color

Status

Condition
C103

Red

On

   DTE is sending data to modem
C103

Red

Off

 DTE is not sending data to modem
C104

Red

On

 Data is being sent to DTE
C104

Red

Off

 Data is not being sent to DTE
C106

Red

On

 CTS signal is on
C106

Red

Off

 CTS signal is off
C109

Red

On

 Carrier is present in line
C109

Red

Off

 No carrier is present
C142

Red

On

 Modem is in loop condition
C142

Red

Off

 Modem is not in loop condition
PWR Green On Power is on
PWR Green Off Power is off
RDL

Red

On

 Modem has received a remote loop sequence
RDL

Red

Off

 No loop sequences are being received
TEST

Red

On

 Modem is performing a test
TEST

Red

Off

 Modem is not performing a test


V.54 NETWORK TYPE SELECTION

Setting

DSA/6

DSA/7

Disabled

Off

Off
Tandem mode On Off
Multi-point mode Off On
Point to Point mode On On


CLOCK SOURCE SELECTION

Setting

DSC/1

DSC/2

External clock

On

On
Slave clock On Off
Internal clock Off On
Not used Off Off
Note:   DSC/3 must be set to synchronous mode (On)


DATA LENGTH/STRUCTURE SELECTION

Setting

DSC/1

DSC/2

1 Start, 6 Data, 1 Stop bit

On

On
1 Start, 9 Data, 1 Stop bit Off On
1 Start, 8 Data, 1 Stop bit On Off
1 Start, 7 Data, 1 Stop bit Off Off
Note:   DSC/3 must be set to asynchronous mode (Off)


BAUD RATE SELECTION

Setting

 DSC/5 DSC/6 DSC/7 DSC/8

300bps

 On On On On
600bps Off On On On
1200bps On Off On On
2400bps Off Off On On
4800bps On On Off On
9600bps Off On Off On
19200bps On Off Off On
Auto
(2.4bps to 19.2Kbps)		 Off Off Off On
225bps On On On Off
450bps Off On On Off
900bps On Off On Off
1800bps Off Off On Off
3600bps On On Off Off
7200bps Off On Off Off
14400bps On Off Off Off
Auto
(3.6bps to 14.4Kbps)		 Off Off Off Off


RTS/CTS DELAY

Setting

DSD/1

 DSD/2

DSD/3

0 bit-time

On

 On

On
16 bit-time Off On On
32 bit-time On Off On
64 bit-time Off Off On
128 bit-time On On Off
256 bit-time Off On Off
512 bit-time On Off Off
C105 always active Off Off Off