Chapter 2. Installation

Chain In (PC)

The unit can be controlled from an external PC connected directly or via modem to the Chain-In port. When using Chain-In, the selection of the Control Port baud rate from 9600 (factory default), 1200, 2400, or 4800, 19200, or 38400 must be made using the UNIT CONFIGURATION menu. See Unit Menu on page 5-14 for details.

Chain In/Chain Out

TDU 120e units and other TDUs and TSUs can be linked together to form a chain. Figure 2-3 provides an example of a chain-in arrangement with a PC or a modem. The first TDU 120e in the chain receives controlling input from the PC or modem.

PC or Modem

 

 

 

 

Control

Chain

Chain

Chain

Chain

Chain

Input

Out

In

Out

In

Out

TDU 120e

TDU 120e/

TDU 120e/

 

 

TSU 100/TSU

TSU 100/TSU

Figure 2-3. Example of Chain-in

Subsequent TDU/TSUs in the chain are in a position to in- take information from another TDU or TSU. This in-tak- ing of information from another TDU in the chain is identified as Chain In. The baud rate for the chained units must match that of the first unit.

Unless locked out externally, the front panel can also con- trol the unit.

2-10

TDU 120e User Manual

61202156L2-1

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ADTRAN TDU 120e user manual Chain In PC, Chain In/Chain Out