Specifications

Operating Characteristics
August 08, 2000 68P81095E55-E 3-1
Chapter 3
Operating Characteristics
This section describes how the individual iDEN
®
system Network Elements are
physically and logically linked together and how the elements interact to perform
Dispatch, Interconnect, Circuit Switched and/or Packet Data operations.
Physical Interface
The iDEN system uses several interface types. The transport facilities between the
DACS may include microwave, fiber, and/or copper. The iDEN system uses:
• Air Interface
• Coaxial
•V.35
•EIA - 232
•Twisted Pair
•T1/E1
Air Interface
The network link between the mobile (MS) and the Fixed Network Equipment
(FNE) is Radio Frequency (RF). This is discussed in greater detail in Radio Link.
Coaxial
Within the system, coaxial cable is the physical interface between the EBTS BRs and
the antenna system. Coaxial cable is also used between the BRs and the cell site
(EBTS) distribution and control circuitry.
V.35
The OMC-R Operations and Maintenance Link (OML) uses V.35 cabling between
the OMC and the DAP. The connection to the BSC may also be V.35 cabling.
EIA-232
The OMC-R, OML also uses EIA-232 cabling to the switched circuits (MSC).
Twisted Pair
Thin-wire (10baseT) Ethernet may be used between the OMC and the T-DAP. A
minimum of Category 5 cable and connections is required. Other elements may be
optionally networked by Ethernet. With Software Release 8.0 and above OMC-Rs
may be networked using an Ethernet link.
T1/E1
The iDEN network has standardized on the T1 as the physical interface. The
exchange of information between the various pieces of equipment is over direct link
or dedicated facilities using T1 (E1) industry standards. Full or fractional T1s are
used. In the MSO, the network devices are interconnected with T1s. Optimization,
load balancing and capacity planning will be affected by the physical backbone used.
Network and iDEN equipment is ordered with the appropriate hardware to support
either E1 or T1 facility. The equipment may be re-configured between the span
types by replacing hardware. Since an E1s have a different configuration than T1s,
reconfiguring may impact the capacity of network elements.