User Manual

16
 LNA Module, described on page 3.
 Downconverter, described on page 3.
 Test Points, described on page 3.
 Monitoring Modems, described on page 3.
The following sections describe each component in detail. For the technical
specifications of the Base Station rack and of each of the components, refer to
Appendix A: Technical Specifications, on page 3.
WMTS
The WMTS chassis includes the following cards (see Figure 8):
 Host card – The host card serves as a PCI bus arbiter and provides system clock
and timing.
 Quad Downstream module – The quad downstream module consists of a
universal card inserted in the front portion of the chassis matched with a modulator
card inserted in the rear of the chassis. This downstream module generates IF of
four downstream channels. It also serves as the interface to backbone data traffic.
 Hex Upstream module – The hex upstream module consists of a universal card
inserted in the front portion of the chassis matched with a demodulator card. It
demodulates the data from the six US channels and extracts the Ethernet packets.
 C&F card – The C&F card runs the WMTS control application. It also serves as the
interface to backbone management data traffic.
 Sharp IF Filter card – The filter card is inserted in the rear of the chassis. It rejects
unwanted signals, ensuring that the signals received by the base station are free of
interference. This is an optional card.
The system cards communicate and handle traffic over a standard internal Compact
PCI bus.
 To extend the system, more upstream and downstream modules can be inserted
into the WMTS. Each module consists of a universal card, a rear card (Upstream or
Downstream), and an appropriate software application. Two slots are reserved, one
for the host card and one for the C&F card. The system can be extended to any
combination of 6 communication modules.
WMTS Physical Description
The WMTS is mounted in a standard 19” by 6U high rack-mounted chassis, as
illustrated in Figure 8. The chassis has a fan tray above the unit, bringing the total
height required in the rack, to 8U. The eight bay chassis contains 8 slots in the front, 6
slots in the rear, and a mid-plane card in between, used to interface the cards. Blank
panels cover unused slots.
A standard Compaq PCI bus is used to transfer traffic and data between the system
cards. The power supplies, host card and the universal cards are inserted in the front of