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
3-12
Cisco ONS 15216 EDFA2 Operations Guide
78-16033-01
Chapter 3 Installation
Communications
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
.
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 3-13
gives 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.
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
Table 3-4
Communication Component List
Component
Notes
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
