Instruction manual

Control Unit
The lines and stations that can be connected to the jack types shown in
Figure 2-1 are described below:
1. A DS1 line jack connects a Digital Signal 1 (DS1) facility provided by the
telephone company. The DS1 facility can be set for either T1 or Integrated
Services Digital Network Primary Rate Interface (ISDN-PRI) operation.
The DS1 facility programmed for T1 operation supplies 24-channel emulation
of any combination of ground-start (GS), loop-start (LS), and tie trunks. When
programmed for ISDN-PRI operation, the channels are used to connect ISDN
services such as Megacom® WATS.
2. Tie-trunk jacks connect private lines from other communications systems.
3. Line jacks (LS) connect loop-start lines from the telephone company.
4. Power failure transfer (PFT) jacks connect single-line telephones that work
during power failures. Analog multiline telephones and digital/lSDN (MLX)
telephones cannot be used as power failure telephones.
5. Line jacks (GS/LS) connect loop-start or ground-start lines from the
telephone company.
6. Off-premises telephone (OPT) jacks connect off-premises tip/ring equipment
such as single-line telephones, fax machines, or answering machines.
Tip/ring equipment connects directly to an outside line and works on a single
pair of wires.
7. Analog station jacks connect analog multiline telephones and adjuncts.
See the Data Guide for more information
8. Digital station jacks connect MLX telephones or data devices such as the
on data stations.
ISDN 7500B Data Module.
9. Basic telephone station jacks connect tip/ring equipment such as single-line
telephones, fax machines, or answering machines. Basic telephone station
jacks also connect optional applications such as MERLIN Attendant or
MERLIN MAIL Voice Messaging System for the MERLIN LEGEND
Communications System.
Table 2-1 shows the capacities of each module.
Modules 2-3