CX950 Hardware Reference Manual
1-6
3021M100-002
Digital
Interface
Module
The Digital Interface Module (DIM) provides up to two ports which may be used
to interface T1, E1 or PRI (Primary Rate Interface) lines for voice and data. The
DIM may support a maximum of 30 simultaneous voice channels across the two
ports. The card supports transmission rates of 8 Kbps (G.729) and 40, 32, 24, or
16 Kbps (G.726), or 64 Kbps (G.711).
1.2.5 Constraints
Certain I/O cards cannot coexist in the same CX950 chassis due to the use o
faster DSPs (Digital Signaling Processors). A C.54 DSP is used on the DAV I/O
card, the BRI-DV I/O card, the DIM I/O card. These cards therefore cannot be
used in the same chassis as the DDVC card (which must be used with the ISDN
S/T I/O Card) and the Analog Voice I/O card, which use a C.31 DSP.
1.2.6 Optional Cards
The following paragraphs describe optional plug-in cards that support the
functionality of specific I/O cards on the motherboard.
Serial
Expansion
Module
The Serial Expansion Module (SEM) provides Serial Communications
Controllers (SCCs) for I/O slots 5 through 8. The SEM must be installed
whenever an I/O card requiring access to a serial communication controller is
installed in one of these slots (5-8).
Ring
Generator
The Ring Generator supplies -12VDC, -48VDC, and 86VAC (ringing voltage) to
the Analog Voice I/O card. The Ring Generator is required for the Dual Analog
Voice I/O card (DAV I/O) as well, however, the LIDs on the DAV I/O card
generate their own ringing voltage.
1.3 Recommended Configurations
The motherboard accommodates up to eight I/O cards. All I/O cards support one
port with the exception of the Multi-I/O card, and the Universal I/O card, which
support five ports each.
Table 1-1 shows the recommended CX950 configurations:
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