Specifications

Digital Access Cross Connect Switch
iDEN® System
August 08, 2000 68P81095E55-E 2-7
Digital Access Cross Connect Switch
Physical Components
The Digital Access Cross Connect Switch (DACS) is the attachment point of T1/E1
span lines (trunks) between the iDEN system equipment and the external transport
facilities. The point-to-point connections are discussed in separate manuals and in
Interfaces. The DACS is not part of the iDEN network’s equipment but is required
to connect the remote locations to the Mobile Switching Office (MS)
Functional Characteristics
The DACS is a channel bank/multiplexer that distributes the DS0s (span lines) of the
T1s to EBTSs and the Fixed Network Elements that are connected though the
external equipment or transport facilities (Figure 2-3). These may include T1, DS3s
DS4s Fiber Optics or microwave.
• Dispatch and Packet Data DS0s (frame relay spans) are routed from the EBTS
to the Metro Packet Switch
• Interconnect paths and control signalling is wired from the EBTS spans to the
Base Site Controllers
• Operations and Maintenance information on a single DS0 between the EBTS
and the OMC
• External transport facilities are often connected to the iDEN system through a
DACS
Trunking and span line connections are discussed in Networking and in separate
manuals.