Cisco Systems 15216 EDFA2 manual Modem Signals, Modem Power Up, Modem Configuration Settings

Chapter 3 Installation

Communications

F I N A L D R A F T - C I S C O C O N F I D E N T I A L

Table 3-4 Communication Component List

Component		Notes
1	RJ-11 to RJ-11 telephone cable	For connection between the modem and
		PSTN dial-up telephone line.
1	PSTN dial-up telephone line

3.5.4.2 Modem Signals

The only signals required for communication are TXD (transmit), RXD (receive), and SIGNAL GROUND. By adjusting the modem manufacturer settings, the other signals can be ignored.

3.5.4.3 Modem Power Up

The modem has a DIP switch that overrides certain NVRAM settings during a power up. For consistent operation throughout the power cycles, the DIP switches must be set as displayed in Table 3-5.

Table 3-5 Modem DIP Switch Setting

DIP Switch Setting	Up (U) or Down (D)	Description
1	D	Data terminal ready override
2	U	Verbal result codes
3	U	Suppress result codes
4	D	No echo, offline commands
5	U	Auto-answer on first ring, or higher if
		specified in NVRAM
6	U	Carrier detect normal
7	U	Load NVRAM defaults
8	D	Smart mode

3.5.4.4 Modem Configuration Settings

After configuring the DIP switch settings, each modem configuration must then be set using a terminal program such as Microsoft Windows HyperTerminal.

Connect the modem to the PC serial port using a DB-25M to DB-9F modem cable as per the manufacturer recommendations.

Set the terminal communication parameters as follows:

•19,200 baud

•No parity

•8 bits per character

•1 stop bit, and no flow control

Table 3-6 on page 3-13gives a brief description of the modem settings that are stored in NVRAM. These settings survive power supply interruptions. Use these settings to configure each modem.

Cisco ONS 15216 EDFA2 Operations Guide

3-12 78-16033-01