ADTRAN TSU 600 User Manual
Page 24
Chapter 1. Introduction
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TSU 600 User Manual
61200.076L2-1
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. Passthru for operation with a PBX (Terminal
Interface - TI).
• 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. It can also be used as a second DS1
interface to provide an up to 3 Mbit aggregate
throughput.
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. 2/4 channel FXS/FX0/E&M.
• OCU DP. Interfaces to DDS or 4-wire Switched 56.
• Dial backup.