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OPTION PORTS
Secondary Interfaces (SI)
Other Data Interfaces
Dial Backup
61200.129L1-1
The option ports vary depending on the option
modules installed.
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.
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.
Permits a dial up circuit to backup some or all of the
T1 bandwidth. Operates with an external DCE.
TSU 120 User Manual
Chapter 1. Introduction
9
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