Modem User's Guide
Table Of Contents
- Contents
- Warranty, Sales, and Service Information
- About This Guide
- About the Model 7986 Standalone Termination Unit
- Using the Asynchronous Terminal Interface
- Initial Startup and Configuration
- Monitoring the Unit
- Testing
- Messages and Troubleshooting
- Security
- IP Addressing
- Configuration Option Tables
- Standards Compliance for SNMP Traps
- Cables and Pin Assignments
- Technical Specifications
- Glossary
- Index
Initial Startup and Configuration
3-8
7986-A2-GB20-00
September 1998
Switchpack Definitions
Manually change configuration options by moving Switchpack S1 DIP switches
on the card. Table 3-1 lists Switchpack S1 definitions.
Table 3-1. Switchpack S1 Definitions
Switch # . . .
Allows you to . . .
Default in Bold
1 Enables or disables Switchpacks S1 and S2.
OFF = Switchpacks Disabled
ON = Switchpacks Enabled
2 Controls line termination.
OFF = 120 Ohm
ON = 75 Ohm
3 Selects the unit’s primary timing source. Only valid for units configured
as LTU.
OFF = Internal Clock
ON = External Clock
4 Controls the unit’s E1 line coding.
OFF = HDB3
ON = AMI
5 Not used
6 Enables CRC-4 monitoring.
OFF = Enable CRC-4
ON = Disable CRC-4 monitoring
7 Controls whether Channel 16 contains signaling information or data.
OFF = Channel 16 is used for signaling
ON = Channel 16 is used for data
8 Not used