Chapter 1. Introduction
61200.129L1-1
TSU 120 User Manual
9
OPTION PORTS
The option ports vary depending on the option
modules installed.
Secondary Interfaces (SI)
The secondary interface is an additional interface to a
DS1, a DSX1 facility, or some other network service,
and it offers a source of timing. The type of interface
depends on the option module installed. The interface
includes the following:
• DSX1 An additional DSX-1 interface can be added
for data or voice applications.
• Full Drop and Insert Permits the dropping of data
and insertion of new data into the same DS0 time
slot. This SI module includes a long-haul DS1
interface.
Other Data Interfaces
Additional data interfaces can be installed in the
option slot, and include the following:
• Nx56/64 Serial Interface This module is the same as
the base Nx interface but offers single or dual V.35
ports.
• Voice Interface
• OCU DP Interfaces to DDS or 4-wire Switched 56.
Dial Backup
Permits a dial up circuit to backup some or all of the
T1 bandwidth. Operates with an external DCE.
Summary of Contents for TSU 120
Page 1: ...TSU 120 PART NUMBER 1200129L1 USER MANUAL 61200 129L1 1A July 1997...
Page 52: ...Chapter 2 Installation 38 TSU 120 User Manual 61200 129L1 1...
Page 132: ...Appendix C System Configuration Charts 118 TSU 120 User Manual 61200 129L1 1...
Page 138: ...Appendix D TSU 120 System Messages 124 TSU 120 User Manual 61200 129L1 1...
