CTM 100 Op Manual

Installation and Maintenance of the

CTM-100 Dual-Port Modem

PAQ1900 PreliminaryPrint Date: 11/20/00

Contents

1. Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1Flexible Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Data Rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Timing Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Specification Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2. Modem Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5LCD Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Menu/Select Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Back Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Chassis Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6AC Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6CDI Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7NRZ Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7RS-232 Serial (Terminal) Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3. Modem Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

The Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9LCD Display Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Menu Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Select Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Asterisk Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Configuration Using the Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Data Rate (RATE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11NRZ Electrical Mode (MODE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11NRZ Logical Mode (CONF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Clock Source (CK_SRC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13Clock Qualify (CK_EDGE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14Data Style (DATA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14Test Pattern (TPATT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Test Mode (TMODE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Loop Mode (LOOP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

CTM-100 Installation and Maintenance Guide iii

Bit Error Rate (BER). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Error Count (ERRORS). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Status (STATUS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Configuration Using the Terminal Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Command Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Command List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17Sample Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

iv PAQ1900 Preliminary

1. Introduction

1.1 Overview

This manual provides information to help you configure, operate and maintain your CTM-100 dual-port, stand-alone modem from Codem Systems, Inc. In addition to an overview, you will also find a description of:

• Modem features

• Hardware connections

• Software options

Codem Systems, Inc. is an ISO 9001 registered company with a commitment to quality. For more infor-mation, please visit our web site at:

http://www.codem.com/

1.2 Description

The CTM-100 is a dual-port, stand-alone modem that converts data between an NRZ format and Condi-tioned Diphase Interface (CDI). The multiformat data can be one of many standards, including RS-423, EIA-530A, X.21, V.35, RS-449, and RS-232. The primary use of this modem is to transport data over long distance (up to two miles) using CX-11230 coaxial cable, as shown in Figure 1-1.

Figure 1-1: Functional Layout

CHASSISGND

100V - 240V AC

GROUP 1

GROUP 1 GROUP 2

GROUP 2

TERMINAL RX TX RX TX

CTM-100-Block-02

OptionalConfig

Terminal

CDINRZ

CTM-100 Installation and Maintenance Guide 1

Introduction

The modem incorporates test functions such as local loopback and bit error rate test (BERT). The BERT functions can be used to test the error performance of a connected link or cable assembly. By using the modem as a repeater, the CTM-100 can also be used to extend the distance that CDI data can travel.

Each of the two ports can be configured independently to communicate with either of the following:

• Data Terminal Equipment (DTE)

An end unit that communicates with the user, converts user information into signals for transmis-sion or reconverts the received signals into user information.

• Data Circuit-terminating Equipment (DCE)

The equipment that performs functions, such as signal conversion and coding, at the network end of the line between the data terminal equipment (DTE) and the line.

By providing flexible communication options, the CTM-100 can connect to most standard RS-530 devices using standard communication cables.

1.2.1 Flexible Configuration

Each port can be configured using the front panel display, or by attaching an external terminal to the RS-232 DB-9 connector on the back of the modem. Flexible configuration allows the user to select the data rate, clock option, RS-530 mode and test options for each port. Data and clock polarity are also programmable, for ease of connection to non-standard devices.

Various test patterns can be selected for checking cables and far end equipment that is connected to the modem. A loopback option can be used with either the CDI or RS-530 port for testing of cables and the modem internal circuitry.

1.2.2 Data Rates

Communication is done through a CX-11230 cable, attached to an SMA connector. Data rate depends upon cable distance, as shown in Table 1-1.

Table 1-1: Data Rate and Cable Distance

To achieve this rate(kb/s)...

Maximum cable distance in km (mi) is...

64 3.2 (2)

72 3.2 (2)

128 3.2 (2)

144 3.2 (2)

256 3.2 (2)

288 3.2 (2)

512 3.2 (2)

2 PAQ1900 Preliminary

Specification Summary

1.2.3 Timing Considerations

Proper planning for timing considerations of master/slave and direction needs be followed for proper error free operation, whether the modem timing comes from the internal clock, the recovered CDI data, or the NRZ interface.

1.3 Specification Summary

Table 1-2 provides a specification summary for the CTM-100.

576 3.2 (2)

1024 1.6 (1)

1152 1.6 (1)

1536 1.6 (1)

2048 1.6 (1)

2304 1.6 (1)

4096 0.8 (.5)

4608 0.8 (.5)

Table 1-2: CTM-100 Specifications

Feature Values

Data Rates (in Kb/s) 64, 72, 128, 144, 256, 288, 512, 576, 1024, 1152, 1536, 2048, 2304, 4096, and 4608

CDI Drive Distance See Table 1-1

CDI Interface Dual SMA connectors

RS-530 Interface DB-25 connector

Power Consumption 15 W (typical use)

AC Power 110/220 VAC, 47-63 Hz

Size 1.75” H, 8.25” W, 14” D

Table 1-1: Data Rate and Cable Distance


Introduction


2. Modem Setup

2.1 Overview

Once the CTM-100 modem has been removed from its shipping carton, it can be placed on the desktop, or mounted into a standard 19” rack. The use of two dual-port modems mounted side-by-side in a 19” rack will allow four CDI ports to fit with 1.75” (1U) of space. Note that the dual-modem setup requires a rack-mount shelf kit (part #PAQ2106-XX).

This chapter provides an overview of the external interface of the CTM-100. This includes:

• Front panel description

• Back panel description

2.2 Front Panel

The front panel of the CTM-100 contains an LCD display and a set of menu/select buttons, as illustrated in Figure 2-1.

Figure 2-1: CTM-100 Front Panel

2.2.1 LCD Display

The LCD is a character device, capable of displaying two lines of 20 characters each. Each line is ded-icated to providing information for one of the two data ports. The display can be used to prompt for configuration input, or to display status values.

2.2.2 Menu/Select Buttons

Four push buttons are included on the front panel. Each port has two push buttons associated with it. They are used as follows:

• Menu

CODEMSYSTEMS INC.

CTM-100

0(18

0(18

6(/(&7

6(/(&7

�+2/' 72 (17(5�

�+2/' 72 (17(5�

CTM-100-Front-01


Modem Setup

The Menu button is used to select a menu item (field) to be displayed on the left-side of that port’s associated line of the display screen.

• Select

The Select button is used to cycle through the optional values for that menu item currently being displayed. The currently-enabled selection is marked with an asterisk. The current selection can be changed by holding down the Menu or Select button until the display blanks. When the button is released, the display is restored, and the new selection is active.

2.3 Back Panel

The back panel of the CTM-100 contains the following terminals used to connect to external cables and equipment, as illustrated in Figure 2-1:

• Chassis ground connector

• AC power connector

• CDI interface

• NRZ interface

• RS-232 serial interface

Figure 2-2: Back Panel

2.3.1 Chassis Ground

The back panel contains a connector used to ground the chassis. Use this as your configuration requires.

2.3.2 AC Power

The CTM-100 has a power usage of 110/220 VAC, 47-63 Hz at 15 Watts.

CHASSISGND

100V - 240V AC

GROUP 1

GROUP 1 GROUP 2

GROUP 2

TERMINAL RX TX RX TX

CTM-100-Back-01


Back Panel

2.3.3 CDI Interface

There are four jacks for the CDI interface. Each group uses two jacks (one for CDI input and one for CDI output). Connection to the CDI interface is done using 50 ohm coaxial cable, with SMA jacks. The mating connector for the CDI interface is a standard coaxial SMA plug.

2.3.4 NRZ Interface

There are two NRZ ports (one for each group). Each NRZ interface uses a male DB-25 connector. The pinouts for the NRZ interface are shown in Table 2-1. When the drivers are placed in a single-ended mode (e.g. RS-232), the B inputs and outputs are not used.

Table 2-1: NRZ Interface Pinouts

Pin Acronym Description Dir. If DTE

1 SHIELD Cable shield

2 TXD A TX Data A Output

3 RXD A RX Data A Input

4 RTS A Request to send Output

5 CTS A Clear to send Input

6 DSR A Data set ready Input

7 SGND Signal ground

8 DCD A Data condition A Output

9 RXC B RX Clock B Input

10 DCD B Data condition B Output

11 SCTE B Source Clock B Output

12 TXC B TX Clock B Input

13 CTS B Clear to send B Input

14 TXD B TX Data B Output

15 TXC A TX Clock A Input

16 RXD B RX Data B Input

17 RXC A RX Clock A Input

18 LL A Local loopback Output

19 RTS B Request to send B Output

20 DTR A Data terminal ready A Output

21 RL A Remote loopback Output

22 DSR B Data set ready B Input


Modem Setup

2.3.5 RS-232 Serial (Terminal) Interface

A standard male DB-9 serial port connector is located on the CTM-100 rear panel. This allows an optional serial connection to an external terminal for command-level configuration and testing. The serial port uses a standard RS-232 port operating at 9600 bps, 8 data bits, no parity, one stop bit.

23 DTR B Data terminal ready B Output

24 SCTE A Source Clock A Output

25 TM A Test mode Input

Table 2-2: Serial Port Pinouts

Pin Acronym Description Direction

1 DCD Data Carrier Detect Not Used

2 RXD Receive Data Input

3 TXD Transmit Data Output

4 Not Used

5 GND Ground

6 DSR Data Set Ready Not Used

7 RTS Request To Send Not Used

8 CTS Clear To Send Not Used

9 Not Used

Table 2-1: NRZ Interface Pinouts (Continued)


3. Modem Configuration

3.1 Overview

The CTM-100 modem can be configured using the front display panel, or by connecting an optional ter-minal to the serial port provided on the back. Configuration settings are stored in non-volatile memory so that they are saved when the unit is turned off, and restored when it is turned back on.

This chapter will help you to configure your CTM-100, with discussions of:

• The front panel

• Configuration using the front panel

• Configuration using terminal commands

3.2 The Front Panel

The front panel includes an LCD display area, and four push buttons, as illustrated in Figure 3-1.

Figure 3-1: CTM-100 Front Panel

Dedicated to each of the two supported ports is:

• An LCD display line

• A Menu button

• A Select button

3.2.1 LCD Display Lines

The display lines provide status information in the form shown below.

GPn ITEM: VALUE *

CODEMSYSTEMS INC.

CTM-100MENU

MENU

SELECT

SELECT

�+2/' 72 (17(5�

�+2/' 72 (17(5�

CTM-100-Front-02

GP1 ITEM: VALUE *GP2 ITEM: VALUE *


Modem Configuration

The format of the display line is described in Table 3-1.

3.2.2 Menu Button

The Menu button is used to scroll through menu items. Each time the menu button is pressed, the next in a series of configurable items is displayed. When a menu item is displayed to the left of the “:” sym-bol, an optional value is displayed to the right.

Note that there are also non-configurable items that might be displayed, such as STATUS.

3.2.3 Select Button

The Select button is used to scroll through optional values. When the desired value is displayed, hold this Select button down until the LCD screen clears to make it the current selection. After the button is released, the screen will refresh.

3.2.4 Asterisk Display

The Asterisk symbol (*) is displayed when the VALUE field is displaying the currently selected value. It is not displayed when one of the optional values that is not the current selection is being displayed.

3.3 Configuration Using the Front Panel

The modem can be configured using the front panel by using the buttons, as described above. Table 3-2 lists the menu items that can be displayed for each group.

Table 3-1: Display Line Format

The field... Indicates...

GPn The group (or port) number

ITEM The menu item currently being displayed

VALUE An optional value for the menu option

* Asterisk indicates this is the currently selected value

Table 3-2: Front Panel Menu Items

The item... Is used to... Options include...

RATE Select the port data rate to be used. Rate from table 1 or AUTO

MODE Set NRZ signal electrical mode. OFF, 423, 530, X21, V35, 449, 232

CONF Set the equipment device type (logical mode) DTE or DCE


Configuration Using the Front Panel

(Didn’t see INS_ERR on the test modem in my office).

Each of the menu items is described in further detail in the following sections.

3.3.1 Data Rate (RATE)

The configuration RATE screen selects the port rate to be used. The options are 64, 72, 128, 144, 256, 288, 512, 576, 1024, 1152, 1536, 2048, 2304, 4096, 4608 Kb/s, or AUTO. The AUTO rate selection automatically determines the port rate from the clock source.

NOTE: If the clock source (CK_SRC) is the internal (INT) clock then AUTO is not an optional setting. If AUTO is selected then CK_SRC = INT is not an option.

3.3.2 NRZ Electrical Mode (MODE)

The configuration MODE screen selects the NRZ signal electrical interface type. The possible options are EIA-530A, RS-423, X.21, V.34, RS-449, RS-232, or Disable. The Disable option places the port in Tri-state mode.

CK SRC Set the clock source, including direction and where timing is derived from.

CDI, NRZ, INT, TXC

EDGE Set the clock edge, allowing for clock/data transmit change to make up for cable length difference.

NORM (normal) or INVERT (inverted)

DATA Describe the data style, allowing for normal or inverted.

NORM or INV

TPATT Specify the test pattern to be generated or detected.

511, ALT, 1, 0

TMODE Specify test mode, including direction of the test patterns are to be generated and detected.

OFF, NRZ, CDI

LOOP Set loopback mode, to allow data to loop back to the connected equipment.

OFF, NRZ, CDI, BOTH

BER Display or clear bit error rate (the calculated number of received bits in error over time).

? or CLEAR

ERRORS Display or clear error count (the actual number of bit errors received).

?, CLEAR, or INS

STATUS Display the status of the port. ? (status only)

Table 3-2: Front Panel Menu Items (Continued)

The item... Is used to... Options include...


Modem Configuration

3.3.3 NRZ Logical Mode (CONF)

The configuration CONF screen selects the equipment device type. The options are DCE/INT, DCE/EXT, DTE/INT, or DTE/EXT. The device type DCE or DTE describes the direction of data and clocks. The selection of INT or EXT describes how the Tx Data is clocked or qualified. The following figures show the difference between the four optional settings:

When the DCE/INT option is selected, as illustrated in Figure 3-2, the receive Tx Data is qualified by the generated internal port clock that is present at the Tx Clock leads. This is useful for DTE devices that do not produce SCTE timing.

Figure 3-2: Conf DCE/INT Selection

When the DCE/EXT option is selected, as illustrated in Figure 3-3, the receive Tx Data is qualified by the port clock that is present at the SCTE leads. This is for DTE devices that produce SCTE timing.

Figure 3-3: Conf DCE/EXT Selection

When the DTE/INT option is selected, as illustrated in Figure 3-4, the generated internal port clock that is present at the SCTE Clock leads clocks out the Tx Data. This is useful for DCE devices that do not produce a Tx Clock.

MODEMDCE/INT

RxD 3 (16)

RxC 17 (9)

TxD 2 (14)

TxC 15 (12)

SCTE 24(11)

REMOTEDTE

Q D

Internal Clock

Conf-DCE/INT

Conf-DCE/EXT

MODEMDCE/EXT

RxD 3 (16)

RxC 17 (9)

TxD 2 (14)

TxC 15 (12)

SCTE 24(11)

REMOTEDTE

Q D

Internal Clock



Figure 3-4: Conf DTE/INT Selection

When the DTE/EXT option is selected, as illustrated in Figure 3-5, the received Tx Clock is used to clock out the Tx Data. This is for DTE devices that produce Tx Clock timing.

Figure 3-5: Conf DTE/EXT Selection

3.3.4 Clock Source (CK_SRC)

The clock source (CK_SRC) option identifies which direction and where the port timing is derived from. The options are CDI, INT, SCTE, RxC, or TxC. The INT setting cannot be used when the RATE is set to AUTO. The following figures show the options depending on whether the device is of type DCE or DTE.

When the modem is in DCE mode (CONF=DCE/INT or DCE/EXT) then clock source options include CDI, INT and SCTE. While in this mode, the SCTE setting can be used, but RxC and TxC do not apply, as illustrated in Figure 3-6.

Conf-DTE/INT

MODEMDTE/INT

RxD 3 (16)

RxC 17 (9)

TxD 2 (14)

TxC 15 (12)

SCTE 24(11)

REMOTEDCE

Internal Clock

D Q

Conf-DTE/EXT

MODEMDTE/EX

T

RxD 3 (16)

RxC 17 (9)

TxD 2(14)TxC 15 (12)

SCTE 24(11)

REMOTEDCE

InternalClock

D Q


Modem Configuration

Figure 3-6: Clock Source SCTE Setting

When the modem is in DTE mode (CONF=DTE/INT or DTE/EXT) then clock source options include CDI, INT, RxC and TxC. While in this mode, the TxC and TxC settings can be used, but SCTE does not apply, as illustrated in Figure 3-7.

Figure 3-7: Clock Source RxC/TxC Settings

3.3.5 Clock Qualify (CK_EDGE)

The CK_EDGE (clock edge) setting allows for changing of transmit clock/data phase relationship to make up the difference in cable length, or non-compliant equipment. The options are NORM (normal) or INV (inverse).

3.3.6 Data Style (DATA)

The DATA setting allows the option to invert the data for non-compliant equipment. The options are NORM (normal) or INV (inverse).

Clk-DCE-SCTE

MODEMDCE

CLK SRC

RxD 3 (16)

RxC 17 (9)

TxD 2 (14)

TxC 15 (12)

SCTE 24(11)

REMOTEDTEInternal Clock

CDIRECOVERY

OSCILLATORPLL-VCOTIMING

Clk-DTE-RxTx

MODEMDTE

CLK SRC

RxD 3 (16)

RxC 17 (9)

TxD 2 (14)

TxC 15 (12)

SCTE 24(11)

REMOTEDCE

Internal Clock CDIRECOVERY

OSCILLATOR

PLL-VCOTIMING



3.3.7 Test Pattern (TPATT)

The TPATT (test pattern) setting specifies which pattern is to be generated/detected in the direction determined by the TMODE setting for testing of the communications link. The options are 511, 1:0, all 1’s, or all 0’s.

3.3.8 Test Mode (TMODE)

The TMODE (test mode) setting enables and determines which direction the test patterns are to be gen-erated and detected. The options are OFF (default), NRZ, or CDI.

3.3.9 Loop Mode (LOOP)

The LOOP settings are used to loopback data toward the connected equipment. Care should be taken for clock source consideration. The options are OFF (default), NRZ or CDI.

3.3.10 Bit Error Rate (BER)

The Bit Error Rate (BER) status displays the calculated number of received bits in error over time. Pressing the SELECT button will reset the BER counters and restart the calculations.

3.3.11 Error Count (ERRORS)

The ERRORS menu item options depend upon the value of the test mode (TMODE). When test mode is off, this has little value. When a test mode has been selected, ERRORS will initially show the actual number of bit errors received.

When ERRORS is the current menu item, press SELECT until you see:

• CLEAR, then hold the SELECT button down until errors are cleared.

• INSERT, then hold the SELECT button down to insert a single bit error into the bitstream deter-mined by TMODE. This is used for a sanity check while testing of data link systems to ensure data paths are set according to a test plan. When an error is inserted, the error should be detected some-where in the link.

3.3.12 Status (STATUS)

The STATUS screen displays the current status of the Port. The contents displayed are the programmed rate, and port activity. The rate value is that which is programmed by the user or the value programmed by the auto-rate selection circuitry while in the RATE = AUTO mode. If the RATE programmed by the user is not equal to the rate sensed by the auto-rate circuitry, the rate will be followed by a “?”. The dis-played rate is in Kb/s.


Modem Configuration

Following the rate status is the CDI port activity status. It is used as follows.

Following the CDI port activity status is the NRZ port activity status. It is used as follows.

3.4 Configuration Using the Terminal Commands

By attaching an optional terminal to the serial port at the back of the modem, configuration can be done using the keyboard.

3.4.1 Command Format

The format for a serial command is as follows:

[cmd][ch][param]

Where:

cmd (command) is the menu item to be set or viewed

ch (channel) is the group on which to perform the command

param (parameter) is the parameter value to assign to the menu item

Using the ? character for:

cmd will display the help screen

param will display current settings for that menu item

Valid channel values are 1 or 2. The channel number 0 can be used in both the SHOW and the STS com-mands, to display status for both channels.

The value displayed is... If the CDI port is...

“C” active and is also the system clock source

“c” active, but is not the system clock source

“ “ not active

The value displayed is... If the NRZ port is...

“N” active and is also the system clock source

“n” active, but is not the system clock source

“ “ not active


Configuration Using the Terminal Commands

3.4.2 Command List

Table 3-3 lists the available commands, and their functions.

3.4.3 Sample Commands

Example 3-1 shows the results of the ? command, used to provide the user with the current release num-ber, as well as on-line help with command syntax.

Example 3-1: Help Command

ctm-100> ?

Codem CTM-100 CDI Modem, Build $Name: REL_1_1_2 $

Command syntax is [cmd][ch][param]. Param of ’?’ gets status.

ber <ch> <?|clear> = read/clear bit error rate

conf <ch> <dte|dce>/<int|ext> = set dte or dce

Table 3-3: Configuration Terminal Commands

Command Item Optional Values

BER Bit Error Rate ? or CLEAR

CONF NRZ Logical Mode DTE or DCE

COUNT Error Count ?, CLEAR, or INS

DATA Data NORM or INV

EDGE Clock Qualify NORM (falling) or INV (rising)

LOOP Loop Mode OFF, NRZ, CDI, BOTH

MODE NRZ Electrical Mode OFF, 423, 530, X21, V35, 449, 232

MRATE Measured Rate ? (provides status only)

PORTS Port Activity ? (provides status only)

RATE Data Rate Rate from Table 1-1 or AUTO

RESET Reset System N/A

SHOW Show Configuration ? (provides status only)

SRATE Auto-Set Rate ? (provides status only)

SRC Clock Source CDI, NRZ, INT, TXC

STS Status Summary ? (provides status only)

TMODE Test Mode OFF, NRZ, CDI

TPATT Test Pattern 511, ALT, 1, 0

? Help Screen N/A


Modem Configuration

count <ch> <?|clear|ins> = read/clear bit error count

data <ch> <norm|inv> = set normal or inverted data

edge <ch> <norm|inv> = qualify on falling or rising edge

loop <ch> <off|nrz|cdi> = enable loopback on ports

mode <ch> <off|423|530|x21|v35|449|232>

= set electrical mode

mrate <ch> ? = report measured rate

portsr <ch> ? = report port activity status

rate <ch> <auto|64-4608> = set data rate

reset = reset modem

show <ch> ? = dump config (ch = 0 means all).

srate <ch> ? = report rate set by auto mode

src <ch> <cdi|scte|int|txc|rxc> = set clock source

c sts <ch> ? = status summary (ch = 0 means all).

tmode <ch> <off|nrz|cdi> = enable test mode on port

tpatt <ch> <0|1|alt|511> = set test pattern

ctm-100>

Example 3-2 shows the results of the show command, used to display current parameter values.

Example 3-2: Show Command

ctm-100> show 0 ?

RATE 1 1024

MODE 1 530

CONF 1 DCE/EXT

SRC 1 SCTE

EDGE 1 NORM

DATA 1 NORM

TMODE 1 OFF

TPATT 1 511

LOOP 1 OFF

RATE 2 AUTO

MODE 2 530

CONF 2 DCE/EXT

SRC 2 SCTE

EDGE 2 NORM

DATA 2 NORM

TMODE 2 OFF

TPATT 2 511

LOOP 2 OFF

ctm-100>

Example 3-3 shows the use of the rate command, used to set data rate.


Configuration Using the Terminal Commands

Example 3-3: Rate Command

ctm-100> rate 1 1024

ctm-100>

Example 3-4 shows the output provided when a command is used incorrectly.

Example 3-4: Command Error

ctm-100> rate 3 1024

E-1: Out of Range

-error-

ctm-100>


Modem Configuration


Documents

CTM 100 Op Manual