Installation. Black Box MD1641A, MD1640A

SERIES II INTELLIGENT DATA/FAX MODEMS

2.2 Installation

The installation of the Series II Modem consists of making the physical connections necessary to render the modem functional with your computer. This includes making the proper serial, phone line, and power connections. Refer to Figure 2-1 below for the Series II Modem

336 (MD1641A) or to Figure 2-2 on the next page for the Series II

Modem 336+ (MD1640A). Following the installation instructions are some preliminary aspects of issuing AT commands and the Modem's

"Originating/Answering" capabilities.The installation process involves:

1.

Verify the settings of DIP switches #5 (Originate vs. Answer mode) and #10 (Lease Line vs. Dial-Up operation). See Chapter 9.

2.

Attach the Series II Modem to a dialup phone line and/or a 2-wire leased line using the included RJ11 telephone cords. For the 336

(MD1641A) model, run a cord from the LINE jack to the dialup

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CHAPTER 2: Installation and Connection wall jack or the leased-line wall jack or terminal (refer to Figure 2-1 below). For the 336+ (MD1640A) model, run a cord from the

PSTN jack to the dialup wall jack if you’re connecting to a dialup line; run a cord from the LEASE jack to the 2- or 4-wire leased-line wall jack or terminal if you’re connecting to a leased line (refer to

Figure 2-2 on the next page). 336+ (MD1640A) models only: For fourwire lines, the modem uses pins 1 and 6 to transmit and pins 2 and

5 to receive.

PHONE LINE

VOLUME

INTERFACE

ON

POWER

OFF

Figure 2-1. Series II Modem 336 (MD1641A) Connections

PHONE PSTN LEASE

VOLUME

INTERFACE

ON

POWER

OFF

Figure 2-2. Series II Modem 336+ (MD1640A) Connections

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SERIES II INTELLIGENT DATA/FAX MODEMS

2.

Attach your Modem to your PC or terminal with an RS-232

(or V.24) cable.

3.

Connect telephone set to phone jack (if desired).

4.

Attach your Modem to the AC Power transformer and plug t he AC connector into a live AC outlet.

5.

Turn on power by flipping the "ON/OFF" switch at the left rear of the Modem to the "ON" position.

6. Assuming you have already chosen Dial-Up mode (DIP Switch #10 in the UP/OPEN position) or Leased Line mode (DIP-Switch #10 in the DOWN/CLOSED position, assign your modem to either

“originate” or “answer” mode. It doesn’t matter which mode you select — just give the modem you’re connecting to the opposite setting. For example, if you place DIP-Switch #5 UP, that modem will be the answering modem. Then you should place DIP-Switch

#5 DOWN on the other modem so that it will be the originating modem. Again, it doesn’t matter which is which, as long as the local and remote modems have opposite settings.

7. Verify transmit dBm levels. The transmit level for dial-up lines is -

11dBm. The transmit level for leased lines is -9 dBm and may be set alternately to -15 dBm with DIP-Switch #3.

8.

Verify remote modem's current configuration settings with your

Series II Modem in terms of data compression, error correction, transmission rate, etc. (per Chapter 5, Section 5.7.12, ATL5 and

ATL7 Commands).

9.

Make sure modem and computer/terminal serial port baud rates are adjusted. (Note that several programs can check this for you.

If you have MS-DOS 5.0 or higher, a program called MSD.EXE

(Microsoft Diagnostics) is in your DOS directory. Typing MSD at the DOS prompt brings up a screen that provides a variety of information about your computer. Select COM ports and it lists information about your com port, e.g., UART Type, Address, and

IRQ to name a few. Once you know your serial port's UART type, you can set your communications's software appropriately.)

10. Verify self-test results (Section 2.2).

11. Proceed to Chapter 3 of this manual, or to your data communications software manual.

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