System Adapters - AT&T MERLIN LEGEND Release 3.1 System Manager's Manual

Adapters
You can add one or two DSSs to the MLX-20L or MLX-28D telephone to provide
150 (3 pages for each of 50 buttons) or 300 (3 pages for each of 50 buttons for
each of 2 DSSs) of additional extension buttons. You cannot attach a DSS to an
analog DLC; however, the MERLIN II System Display Console provides a built-in
DSS, and Auto Dial buttons can be programmed on BIS phones for rapid
access to extensions.
Keep these facts in mind if you need to work with DLCs:
You can connect an analog DLC to an analog extension jack on either a
008 or a 408 analog multiline telephone module; an MLX DLC connects
to a digital extension jack on a 008 MLX or a 408 GS/LS-MLX module.
When you assign both DLCs and QCCs in Hybrid/PBX mode, the
maximum combined number of system operator positions is eight; no
more than four can be QCCs. You can assign a maximum of two DLCs
per MLX or analog module.
Only multiline telephones that are connected to the first and fifth
extension jacks on MLX or analog modules can be assigned as DLCs.
This includes DLCs assigned as calling group supervisors and Call
Management System (CMS) supervisors. CMS must be connected to two
extension jacks programmed to support analog DLCs.
You can use an MLX-20L telephone set up as a DLC for system
programming if you connect it to the first or fifth extension jack on the first
MLX module and then designate that jack for system programming.
Adapters
This section describes the adapters that connect adjuncts to the system and to
telephones. System adapters connect directly to the control unit; telephone
adapters connect adjuncts to telephones.

System Adapters

Four system adapters connect directly to the control unit: a channel service unit
(CSU), the Loop-Start Trunk Adapter, the PagePal paging access adapter,
and the Universal Paging Access Module (UPAM).
A channel service unit (CSU) is the interface between the 100D module and the
Digital Signal 1 (DS1) T1 facility provided by the telephone company.
The Loop-Start Trunk Adapter, UPAM, and PagePal connect loudspeaker
paging systems. The PagePac Plus loudspeaker paging systems require no
system adapter.
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System Components