D i a l o g i c P C I L i n e c a r d s
1 5
1081-50821-00 Rev 01
October 2011
Dialogic D/480JCT-T1 PCI Linecard Technical
Specifications
Each Dialogic D/480JCT-T1 linecard provides voice channel support for two T1 links or spans.
Installations that use ―robbed-bit‖ signaling, such as most OneBox applications, provide a 1.544-
megabit-per-second bit stream carried by each T1 span. Typically, each T1 span contains
twenty-four 64-KB (kilobit-per-second) voice channels, plus some additional bits for signaling.
The physical cabling for each T1 span includes two pairs of wires (transmit and receive), one
pair for each direction in which the bit stream must travel.
Although T1 spans can be fitted with connectors of various types, the end of the span that
connects to each port of the D/480 card must have an RJ-48C connector on it. The section
―
Cabling D/480JCT-T1 PCI Linecards to the Telephone System
,‖ provides a pin-out of the RJ-
48C connector for your reference.
NOTE
The D/480 cards that Aastra sells all require high-impedance (120-ohm) wiring. By
comparison, low-impedance (75-ohm) T1 wiring is attached using two BNC-type coaxial
connectors.
Table 7 lists the technical specifications for the Dialogic D/480JCT-T1 PCI linecards approved
for use with OneBox. Figure 12 shows the general layout of the D/480JCT-T1 linecards.
NOTE
Your local telephone company may require some of these specifications. For example, in
the United States, some telephone companies require an FCC registration number if the
linecard is connected directly to central office (CO) lines. Contact your local telephone company
for its requirements.
