Adtran L128 用户手册

Chapter 2: Installation

Express L128/L128T User Manual

61202.070L1-1

The Express L128T supports an analog DTMF telephone type (AT&T 2500) 
with the POTS interface, part number 1202070L2.  Two telephones or other an-
alog devices (like a fax machine or modem) plug into either RJ-11 jack (labeled 
with drawings of telephones) on the rear of the unit.  Using a multipoint line 
allows the POTS and data port to have unique phone numbers. 

Supplementary services such as call holding, three- or six-way conferencing, 
call transfer, and call waiting are fully supported by the  Express L128/L128T 
on a touch-tone telephone. Table 2-A explains how the flash-hook is used for 
handling multi-call situations.

The following functions are performed on a touch-tone phone:

•

Disable call waiting:  

Press **0

•

Enable call waiting:

Press **1

•

Redial last number:

Press **5

•

Enable ExpertISDN:

Press **6

•

Enter Area Code:

Press **7XXX

(where XXX is a 3-digit area code.  
This must be entered first, before 
enabling ExpertISDN.)

•

Enter Phone Number 1:

Press **8XXXXXXX

(where XXXXXXX is the 7- digit 
phone number.  This must be entered
before enabling ExpertISDN.)

•

Enter Phone Number 2:

Press **9XXXXXXX

(where XXXXXXX is the 7-digit 
phone number.  If only one phone
number is assigned, this does not have
to be entered.)