DCB PPP-SR Manuale utente

8500056

PPP-SR

TABLE OF CONTENTS

SECTION 1 - DESCRIPTION.......................................................................2

SECTION 2 - SPECIFICATIONS.................................................................4

SECTION 3 - INSTALLATION.....................................................................5

SECTION 4 - CONTROLS AND INDICATORS .........................................6

SECTION 5 - NETWORK MANAGEMENT PORT.....................................9

SECTION 6 - INTERFACE SIGNALS AND CABLING...........................13

SECTION 7 - TROUBLESHOOTING .......................................................17

SECTION 8 - WARRANTY..........................................................................19

Data Comm for Business, Inc.

807 Pioneer Street

Champaign, IL 61820 March 1, 2000

217-352-3207 Firmware Version: 2.5

1. DESCRIPTION

The DCB PPP-SR is a simple router with one or four local

asynchronous ports, one synchronous WAN port, and synchronous to

asynchronous PPP translation. It connects remote PCs to the

Internet or an Intranet. The PPP-SR accepts IP encapsulated in

frame relay or synchronous PPP from a host router. It converts

these protocols to asynchronous PPP which is passed to the PCs

through its asynchronous com ports.

The PPP-SR also mimics a generic modem handshake to allow PCs

using Microsoft Windows95 (and similar Internet dialers) to use the

built in dial-up networking function, including its PPP protocol. Just

select the generic high speed modem, set up a fixed or dynamic

TCP/IP address, and go on-line.

The PPP-SR may contain a built-in 56/64Kbps DSU (PPP-SR01DSU

and PPP-SR04DSU models) for direct connection to leased telephone

lines. With a built-in DSU, it can be connected directly to DDS or

frame relay telephone company lines. Without the built-in DSU, it

must be connected to an external DSU, ISDN Terminal Adapter,

modem, radio, or FRAD.

Since it connects to the PC using a serial (COM:) port, the PPP-SR

provides a simple way to connect small remote offices or SOHO

locations to the host router without installing a complex LAN at the

remote office. It provides a dedicated remote connection without

the complexity that is normally associated with a LAN and remote

connections.

The PPP-SR is especially cost effective in areas with ISDN usage

billing and in areas where frame relay is economical. Multiple PPP-

SR sites can be connected to the same host router port through the

frame relay cloud. This allows a single host router port to support a

hundred or more remote sites.

The PPP-SR is easy to install and operate. Controls on the unit

include the loopback push button and the Setup switch used to set

the asynchronous terminal interface to 115,200 bps if the user

chooses not to use the default rate of 57,600 bps. The minimum

number of controls and comprehensive indicators make installation

and troubleshooting easy. Diagnostic aids built into the PPP-SR

include LED indicators, ping, a management interface, and statistics.

Features

•56 or 64 Kbps line speed with optional built-in DSU

•Up to 128 Kbps line speed with external DSU

•RS-232 interface rates to 115.2 Kbps

•Converts synchronous PPP protocol to asynchronous PPP

•“AT” command spoofing for Microsoft Windows95 dialer and

similar dialers

•Use over DDS or DDS/frame relay

•Ideal for Internet or Intranets

•Cost effective versus router + NIC + HUB + DSU

•Reliable, high speed private line service alternative to dial-up

modems

2. SPECIFICATIONS

2.1 General

PC port interface: RS-232 implemented in 8-wire RJ-45 jack per

EIA/TIA 561

PC port rate: up to 115.2 Kbps asynchronous

Router Indicators: Power, Activity, Line Error, Modem Ready,

Port 1 Setup

DSU Indicators: Transmit Data, Receive Data, Request to Send,

Clear to Send, Data Carrier Detect, Test

DSU Telco Interface: 8-wire RJ-48S DDS (with built-in DSU)

Composite rate: 56 or 64 Kbps synchronous with built-in DSU

up to 128 Kbps with external DSU

2.2 Environmental

Operation: 0 to 65° C, 10 to 85% relative humidity

Storage: -40 to 85° C, 10 to 85% relative humidity

2.3 Physical / Electrical

10¼” W x 9¾” D x 2½” H

9 VDC external power supply

2.4 Management Port Commands

Help

Show Configuration

Show IP Address

Show Status (Frame Relay)

Configure Ports

Configure IP Address

Configure Options

Frame Relay Configure

Set Identifier

Activity Counter

Zero Counter

Type

Repeat Last Command

Disconnect NMP

Test Tools

Ping IP Address

Show RS-232

Reset SR

3. INSTALLATION

3.1 Unpacking

The following is included with each PPP-SR:

•PPP-SR and external power supply

•Cable for connection to an external DSU or phone line

•Cable for connection to a PC

•Manual

•Information regarding warranty, maintenance contracts and

repair

3.2 Location

Place the PPP-SR in a clear area where you can reach the front

panel for setup and the rear panel to connect the cables. The PPP-

SR has an external power supply that requires a 120 VAC outlet.

The power cord length is about 6 feet.

3.3 Setup

If an IP address is desired, use the Network Management Port CI

command to assign a WAN IP address to the PPP-SR. If the default

PC port rate of 57.6 Kbps isn’t wanted, use the CP command to set

the PC port rate to 9.6, 19.2, 38.4, 57.6, or 115.2 Kbps.

3.4 Connections

Using the cable provided, connect the line port to the DSU or phone

line. Connect PCs to the PC ports using the cable illustrated in

paragraph 6.3.1. One PC connection cable is supplied with the unit.

To connect more than one PC, optional cables must be ordered.

4. CONTROLS AND INDICATORS

4.1 Front Panel Controls (shown with built-in DSU)

4.1.1 Loopback Switch

Not Implemented

4.1.2 Setup Switch

Enables the unit to be configured using the PC connected to port 1. The

Port 1 Setup indicator will light. This makes port 1 operate as a

temporary set-up management port. In this state, port 1 should be

accessed using a terminal emulator program such as Hyperterm. Press

the switch again to return to normal operation.

4.1.3 Reset Switch

Performs a hardware reset. Configuration settings are retained

through the reset.

TXD RXD RTS CTS DCD TEST

SR DATA MULTIPLEXER

LINE MODEM PORT 1

POWER ACTIVITY ERROR READY SETUP LOOPBACK LOOPBACK SETUP RESET

DCB

4.2 Rear Panel Controls

4.2.1 Dip Switches (for built-in DSU only)

The DSU switches are located at the rear of the unit. Switch

functions are shown in the following table:

Switch Down Up

156K 64K (optional)

2Slave Clock Master Clock

3Must Be Down

4RTS Normal RTS Forced ON

5Normal Local Loop ON

6Not Used

NOTE

RTS mode (sw 4) is active in 56Kbps mode only. In 64Kbps mode,

RTS is forced on.

For normal operation with a telephone company line, set the DSU for

SLAVE clock timing (switch position 2 DOWN). For in-house line

driver applications (56K only), set the host DSU for MASTER timing

(switch position 2 UP). The remote unit should remain set for Slave

clock.

Network Network Switches DSU Telco

Power Management Port Composite 4 3 2 1

4.3 Indicators

Indicator Condition Meaning

Power ON Unit has power.

Activity ON Unit is in on-line mode.

Line Error Not Used

Modem Ready ON Network DCD is high.

Port 1 Setup ON

OFF

Network Management Port functions have

been mapped to Port 1 for unit

configuration. To return to normal

operation, press the front panel Port 1 Setup

switch.

Normal operation. Configuration must be

done from the Network Management Port.

Loopback Not used.

TxD Flashing Data is being sent over the link.

RxD Flashing Data is being received from the link.

RTS ON

OFF Forced on or high from the router

No RTS from the router.

CTS Follows RTS CTS signal to the DTE device

DCD ON

OFF Normal condition.

No carrier signal received from the far end.

TEST Flashing Telephone line in loopback.

5. NETWORK MANAGEMENT PORT

5.1 Introduction

The Network Management port (NMP) provides access to vital

statistics and troubleshooting tools. By connecting a terminal or

modem to the NMP a vast array of information is at your finger tips.

This information can also be accessed via a terminal device (or PC

using terminal emulation software) on port 1 when the port 1 setup

switch is depressed.

5.2 Connections and Setup

Connection to the NMP is made either through a port on the rear of

the router or by using Port 1 Setup.

5.2.1 Port 1 Setup

The easiest way to access the NMP functions is by using a terminal

or PC connected to port 1 of the router. A switch located on the front

panel performs this function. See paragraph 4.1.2 for information.

Once the switch is set, no further setup is required.

5.2.2 Dedicated Terminal

The NMP functions are also available through a port on the rear of

the unit labeled Network Management Port. To connect a dedicated

terminal to this port, use the cable described in paragraph 6.3.3. Set

the terminal for 9600 bps, 8 data bits, no parity and one stop bit.

5.2.3 Dedicated Modem

For remote access to NMP functions, a dial-up modem may be

connected to the Network Management Port. You must fix the DTE

interface speed of the modem at 9600 bps, 8 data bits, no parity and

one stop bit. Refer to your modem manual for appropriate setup

procedures. Use the appropriate cable from paragraph 6.3.3 for

connection.

5.3 Using the Network Management port

To activate the NMP, press the ENTER key. When you see AT

YOUR COMMAND >>, the NMP is active and ready for your

commands. Type H <Enter> to display the command set.

5.4 Commands

5.4.1 Help

Displays all available commands.

COMMAND PARAGRAPH

Show Configuration SC 5.4.2

Show IP Address SI 5.4.3

Frame Relay Status SS 5.4.4

Change Port Configuration CP 5.4.5

Change IP Address CI 5.4.6

Change Options CO 5.4.7

Change Frame Relay Conf. FR 5.4.8

Set ID ID 5.4.9

Activity Counters/Zero AC/Z 5.4.10

Test Tools TT 5.4.14

Type TY 5.4.11

Repeat Last Command *5.4.12

Disconnect NMP BYE 5.4.13

5.4.2 Show (Port) Configuration

Displays the current PC port rate. All PC ports are set at the same

rate.

5.4.3 Show (WAN/Port) IP Address

The Show IP Address (SI) command displays the assigned and actual

IP addresses for all ports and the PC port status. It also displays a

WAN IP address for the PPP-SR unit.

5.4.4 Frame Relay Status

The SS command displays the status of the frame relay connection to

the telephone company. This includes DLCI(s), counters, and other

management information

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