Panasonic DBS 576 Technical Manual page 52

Chapter 2. System Overview Section 300-Installation
PRI/23 card (VB-44540): PRI Card
The PRI/23 card is a T-point ISDN primary group interface (23B + D/24B: 1544
kbps) and also an S-point ISDN primary group interface accommodation card.
The PRI/23 card is mounted on a flexible slot to connect the system to ISDN (to
access ISDN services). It is possible to use either the T- or S-point ISDN primary
group interface by setting a switch on the card or by a program setting. By selecting
the mode switch on the card, 8/16/24 channel modes can be selected, however, there
are restrictions to the position of the slot to which the card is mounted. This depends
on the number of accommodating channels. For details on the restrictions of the slot
position, see page 2-39.
A maximum of three cards can be mounted in each cabinet. When there are six
cabinets, a maximum of 18 cards can be mounted.
The PRI/23 card has an on-board lightening arrester, so that the card can be
connected to the carrier trunk corresponding to the T-point primary group interface
through a CSU. (The CSU is not provided.)
This clock provides a network clock synchronizing function.
2-30 DBS 576 (USA), issued 6/2/98 576-13-300