User guide

System Administrator’s Guide – Release 7.5
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Revised: April 9, 2013
Page 112
be used to connect two PBX’s back-to-back, which is not possible with the FXO
configurations. To be clear, whichever mode is selected both ends must match and
only E&M is symmetrical.
The Allworx server supports the configuration of any of the above modes freely mixed
on the T1 line for any time slot, and enables delivering data simultaneously as desired,
commonly referred to as a fractional T1 line configuration. Additionally, while not
commonly needed, configure the PRI simultaneously as well.
13.4.6 Data Support
Configure the Allworx server to carry TCP/IP packets using PPP encapsulation on any
combination of slots constituting a full or fractional T1 interface. In fact, even when
configuring a T1 interface for circuit switched PRI operations, extra (non-voice) slots
can be used for dedicated data connections as long as the remote end service
provider enables such a configuration.
Each T1 interface that has data slots configured on it constitutes a single logical serial
channel using HDLC encapsulation of PPP packets per RFC-1662. Even though any
combination of slots can be used for data on each Digital Line, only one logical data
interface can be defined per T1 line.
To use a Digital Line as the system’s WAN interface (for Internet traffic, inter site, etc.),
you must select the Use a T1 port as the WAN interface option on the Network >
Configuration > Modify page after you have configured the T1 interfaces as desired.
Note: Even though Digital Lines can be configured and reconfigured without a system
reboot, changes to the Network Configuration settings do require a reboot after
updating them.
Note: Since the data support is fully symmetrical, it is possible to connect two Allworx
server devices back-to-back between their T1 interfaces. This can be done either
on the same site or across sites using a dedicated T1 line that spans between the
two sites via the service provider.
13.4.7 Restrictions
Designate only one interface as the logical WAN interface for the 24x and 48x
systems. That is, use only the Ethernet WAN port or one of the T1 interfaces for
routing TCP/IP traffic. You must pick either Ethernet WAN, T1-A, or T1-B ports to be
the data WAN interface for the system even though you are able to provision multiple
interfaces simultaneously. This restriction will be removed in a future software release
such that any combination of Ethernet interfaces or Digital Line interfaces can be used
as redundant/simultaneous WAN interfaces.
13.4.8 Configuration
The configuration of the Digital Lines is dictated by how the service provider provisions
the line to which the interface is. The settings must match the service provider’s
expected configuration or improper operation will result. Fully configure the line or lines
in use before physically connecting the server to the T1 line.