User's Manual
Configuring E1 Cards
Overview of E1 configuration
APX 8000/MAX TNT/DSLTNT Physical Interface Configuration Guide   Preliminary May 9, 2000 9-3
“Configuring a back-to-back 
connection” on page 9-7
A back-to-back connection lets you connect 
two TAOS units to one another over a 
crossover E1 cable.
Back-to-Back
“Specifying the framing” on 
page 9-7
Framing specifies how the bits are sent on the 
line.
Frame-Type
“Specifying E1 signaling” on 
page 9-8
Specify the type of signaling used for your E1 
line. 
Signaling-Mode
 “Configuring ISDN PRI 
signaling” on page 9-8 
You must specify the type of network switch 
providing ISDN service on an E1 PRI line.
Switch-Type
“Configuring ISDN network-side 
emulation” on page 9-9
ISDN emulation enables you to build, send, 
receive, and process ISDN data. 
ISDN-Emulation-Side
“Configuring E1 R1 signaling” on 
page 9-10
R1 is a multifrequency inband signaling 
protocol that uses a set of register signals 
known as MFR1 tones as addressing signals. 
Signaling-Mode 
Switch-Type
“Configuring E1 R2 signaling” on 
page 9-10
Specify R2 signaling and specify R2-specific 
configuration options. 
Signaling-Mode 
Number-Complete
Group-B-Signal
Group-II-Signal 
Answer-Delay 
“Configuring DPNSS signaling” 
on page 9-12
Specify Digital Private Network Signaling 
System (DPNSS) signaling and associated 
options. 
Signaling-Mode 
Layer3-End 
Layer2-End 
NL-Value 
Loop-Avoidance
“Configuring overlap receiving on 
PRI lines” on page 9-13
T1 or E1 PRI lines with overlap receiving 
enable the TAOS unit to gather the complete 
called number from the network switch via a 
series of Information messages, enabling the 
use of features such as called-number 
authentication. 
Signaling-Mode
Overlap-Receiving
PRI-Prefix-Number
Trailing-Digits
T302-Timer
“Configuring clocking” on 
page 9-13 
Set Clock-Source to specify whether the E1 
line can be used as the master clock source 
for synchronous connections. 
Also specify the priority of the E1 lines to be 
used for clocking. 
Clock-Source
Clock-Priority
Table 9-1. E1 line configuration tasks (continued)
Section Description of task Associated parameters










