Defining Settings For Dpnss Or Dass 2 Switches - Lucent Technologies MAX 6000 Configuration Manual

Configuring WAN Access
Configuring E1 lines

Defining settings for DPNSS or DASS 2 switches

If you are connecting a MAX unit to a standard DPNSS or DASS2 switch, you do not have to
change the DPNSS/DASS2 settings. But connection to a nonstandard switch could require
changes in these settings. Also, if you connect two units back-to-back, you have to change
settings for the unit that acts as the network (PBX) side. Following are the relevant parameters,
which are in each Net/E1 > Line Config > Line Config profile > Line N profile
Parameter
L3 End
L2 End
NL Value
LoopAvoidance
For detailed information about each parameter, see the MAX Reference.
L3 End and L2 End parameters
When the switch is set to DPNSS or DASS2, make sure that the L3 End parameter is set to its
default setting of x-side, which specifies CCITT Layer 3. When two PBX devices are
connected back-to-back, specify CCITT Layer 2 by setting the L2 End parameter to specify
which of the PBX devices will send.
NLValue and LoopAvoidance parameters
When the E1 line connects to a DPNSS or a DASS-2 switch, you must set the NL Value
parameter to specify the maximum number of retransmissions that can be sent on the line. Set
the LoopAvoidance parameter to specify the maximum number of transit PBX devices through
which a call can be routed.
3-22
Specifies
Which call (outbound or inbound) the MAX unit's CCITT Layer 3
software processes if a collision occurs. With the default setting
(x-side), the unit processes the outbound call and drops the inbound
call. The default setting (x-side) is required for connection to a
DPNSS or DASS2 switch.
How the MAX unit's CCITT Layer 2 software differentiates between
the acting network (PBX) side and the acting user (ET) side of a
back-to-back DPNSS connection. On a functional level, the L2 End
parameter enables the DPNSS state machine to detect the difference
between Layer 2 command messages and Layer 2 response messages.
Maximum number of retransmissions to send on an E1 line.
Connection to a DPNSS or DASS2 switch requires the default setting
of 64.
Maximum number of transit PBX devices through which a call can be
routed.
MAX 6000/3000 Network Configuration Guide
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