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Specifications
Release 3.3 91
Digital Service Unit Cards
• CEPT Formatter Card The system supports MSDN/DPNSS, DASS II (UK only), and Italian
CAS (Italy only) protocols. The system connects to CEPT links by using a CEPT Formatter
card that has two 30-channels links.
• Conference Card With the Conference card, the maximum number of conferees per sys-
tem is 64 and the maximum number of conferences per system is 21. Without the
Conference card, the maximum number of conferees per system is 24 (at one time) and
the maximum number of three-party conferences per system is 8.
• DS1 Formatter Card The system supports CO, DID, E&M, MSDN/DPNSS, and MSAN/AP-
NSS protocols. The system connects to DS1 links by using a DS1 Formatter card that has
two 24-channel links.
• Fiber Interface Module The FIM, with 16 circuits, provides for the interface with the 3300
ICP Controller.
• BRI Card The BRI card supports Euro-ISDN 2B+D, Basic Rate, or North American National
ISDN-1 and ISDN-2 protocols. There is a 6-circuit BRI card and a 15-circuit BRI card.
• PRI Card The PRI card supports DMS-100, DMS-250, Bellcore National ISDN, 4ESS,
NI-2, 5ESS NI-2, Q.SIG and Euro-ISDN (CTR4) protocols. The E1 PRI has two 30-channel
links; the T1 has two 24-channel links.
• R2 Card The R2 card is a protocol converter, converting incoming MF-R2 signals from the
PSTN to DPNSS and outgoing DPNSS to MF-R2 signals for the PSTN.
CEPT Formatter Card
The CEPT Formatter card is a microprocessor-controlled card which provides DASS and
DPNSS digital trunk interfacing. Each interface controls a 32-channel serial link. Two of the
channels are dedicated to signaling and synchronization. The remaining 30 channels (traffic
channels) transmit PCM voice or data samples.
In a DPNSS network, the connection from the PBX line terminating equipment and either the
BT terminating point or another PBX line terminating equipment must be made with RG59B/U
coaxial cable of characteristic impedance 75W. The maximum cable length is 700ft. Each traffic
channel is considered a trunk and is assigned a trunk number. Trunk numbers allow the
channels to be placed in trunk groups and accessed by the system’s Automatic Route Selection
feature. In the Trunk Service Assignment form, you can assign an incoming traffic channel to
a dedicated answer point for non-dial in trunk applications or provide digit modification for
direct-in dial trunk applications.
CEPT Formatter Card Specification
Card Type DSU
Channels Provided 60 (two 30-channel links)
Features Provided transfers data at 2.048 Mb/s over DPNSS digital links