Panasonic DBS 576 Technical Manual page 43

Section 300-Installation
LTRK / 8 card (VB-44510): Loop Start Trunk Card
The LTRK/8 card is an interface that accommodates loop start type analog trunks.
This card is mounted on a flexible slot to connect analog telephone lines. An optional
"piggyback" daughter circuit card (VB-44513) may be installed on this card to
receive Caller ID. See "CID card (VB-44513): Caller ID Interface Card" on page 2-
23 for more information.
The LTRK/8 card provides 8 circuit trunk interface, detection and answering of call
signals from the trunk, sending signals to the trunk, dialing and speech.
The LTRK/8 card provides a lightening arrester and a safety circuit to directly
connect with general telephone lines.
Figure 2-16. LTRK/8 card
576-13-300 DBS 576 (USA), issued 6/2/98
Chapter 2. System Overview
2-21