5-18
MAX Administration Guide
Administering E1 and T1 Services
Verifying E1 and T1 parameter settings
Table 5-7 summarizes the E1-specific parameters that are available.
T1-specific parameter settings
The VT100 interface of the MAX unit includes a NET/T1 menu. Specify T1 settings by using
three T1-specific parameters in the Line N subprofiles in the Line Config profile. You must
evaluate the settings of T1 parameters as you verify the proper configuration of the unit.
Table 5-7. E1 parameters and settings
Parameter
Description
Back-to-back
Enables you to set up DASS-2 and DPNSS lines in a back-to-back con-
nection. A crossover cable connects an E1 port of one MAX unit to an
E1 port of another unit. No switch is required, and the connection is
entirely local. One unit should be set up for DTE operation, and the
other for DCE operation. This parameter applies only to E1 lines
whose signaling mode is DPNSS. DPNSS is a standard that defines
how different Private Branch Exchange (PBX) systems can operate
together to produce a single virtual PBX.
L2 End
Specifies CCITT Layer 2, which is used to determine the address to
send when two PBX devices are connected back-to-back. In that case,
one side must act as a PBX and the other side must act as an ET.
L3 End
Specifies whether or not the MAX unit supports Layer2 Tunneling
Protocol (L2TP) and, if it does, whether the unit functions as an L2TP
Access Concentrator (LAC), an L2TP Network Server (LNS), or both.
LoopAvoidance
Specifies the number of transit PBX devices through which a call may
be routed.
NL Value
Specifies the number of retransmissions to send on this line. The
default value is required when the line connects to a DPNSS or DASS2
switch. It must be set to its default value when the line connects to a
DPNSS or DASS2 switch. The default is 64.
