Specifications

E&M Tie Lines
Ports three and four on each multipurpose board are the only ports that
support E and M tie lines. Tie lines are special circuits that allow the
DXP to communicate with remotely located equipment such as the
following: another DXP, a PBX, or other common carrier (OCC), for
long distance calls.
DID Lines
The DID board lets stations have their own telephone number without
having a separate line dedicated to that station. The central office
sends digits to the DXP, which interprets the digits and routes the call
to the appropriate station. For example, you can have fifty stations and
only ten DID lines, and each station can still have its own published
telephone number. However, only ten of the stations can be on calls at
one time. DID lines are incoming only, so if you need outward dialing,
you’ll need more than just DID lines.
Auxiliary Port
If you name a line port as an auxiliary port, you condition the line port
to interface with external paging equipment instead of a telephone line.
E&M DNIS Lines
Dialed Number Identification Service (DNIS) is a Tl service feature
for E&M lines. Long distance carriers offer DNIS as a feature to dial
800 and dial 900 lines. DNIS identifies the numbers that callers dial to
reach an internal telephone system. Businesses served by a dial 800 or
dial 900 service allow calls to ring on any available line within an
assigned block of lines and then have their internal telephone system
process the DNIS information to route the calls to their proper
destinations.
Line Programming 8 - 3