Intelligent Transportation Systems - City of Oakland

This same hardwire configuration can be used for other low bandwidth devices such as
DMS, TBS and VDS, if desired.
6.6.2 High Bandwidth Devices
High bandwidth devices require a higher speed connection and can generally utilize fiber
optics, microwave or leased lines such as DSL, T1-T3. The two high bandwidth devices
being recommended in this Strategic Plan are CCTV cameras and kiosks.
When using fiber for CCTV communication, one fiber strand is required from the
backbone to connect to each CCTV camera. This single fiber strand is used to transmit
video in one direction and PTZ data in both directions. However, due to the high
bandwidth requirements of CCTV, the devices must be configured in a point-to-point
topology (see Figure 6-1). In this configuration, one fiber strand is dedicated to each
CCTV camera.
6.7 COMMUNICATIONS NETWORK RECOMMENDATIONS
This section introduces short-, medium-, and long-term communications to deliver the
needs of the City into the 21 st century. The main considerations for communications are
derived from the need for low and high-speed connections. High bandwidth ITS
elements such as CCTV will utilize fiber optics. Some of the low bandwidth ITS
elements will utilize existing conduit and TWP when it is more cost effective than
upgrading to fiber. TWP can be tied directly into the TMC or into field communications
hubs where it is connected to the City’s fiber backbone. Conduit and fiber infrastructure
should be built on the priority corridors mentioned in Section 2. The fiber cable should
be sized to accommodate future communications needs. At a minimum, a 96-strand
fiber cable is recommended on each priority corridor. In the remote areas of Oakland,
where building conduit infrastructure may be costly, CDPD wireless modems or 2.5 GHz
Spread Spectrum (802.11 A/B) would be cost effective solutions to transmit data back to
the TMC. A top-level phased approach to the communications requirements is provided
below.
6.7.1 Short-Term Communications Plan (0 to 5 years)
In the short-term plan the focus should be on the Airport/Coliseum area and some of the
high priority corridors (see Section 8 for specifics). The high priority corridors near
downtown such as Broadway and Telegraph should be tied directly into the TMC. The
high priority corridors near the Airport/Coliseum area should be connected to the MSY
communications hub. From the MSY, a leased T-1 line should be utilized to provide a
high-speed connection to the TMC for the near term. This T-1 line should be dedicated
to the Transportation Services Division and be used for traffic management purposes
only.
CCTV cameras should utilize a fiber network installed in existing or new conduits.
Traffic signals should utilize existing TWP interconnect, if available. If no TWP
interconnect exists, fiber could be used to interconnect signals and transmit CCTV
images. All other low speed ITS elements such as DMS and VDS should utilize wireless
connections or phone drops. Based on the actual deployment and commissioning
schedule of the City’s ITS projects, the best wireless network and service plan should be
City of Oakland ITS Strategic Plan
77 September, 2003