User's Manual

Prism System Overview

FlexWave Prism Element Management System 7.1 User Manual Page 29

Serialized RF (SeRF) Digital Protocol

The SeRF (Serialized RF) digital protocol consists of digitized RF, Fast Ethernet,

and Host to Remote communication and management. The protocol provides you

with full access to the 100BASE-T (Ethernet) connection between the Host and

each Remote, and the ability to provision the RF spectrum of the DARTs. The

digitized RF portion of the SeRF protocol is divided into 12 timeslots, with each

timeslot representing roughly 5 MHz of digitized RF spectrum. Utilizing the full 12

timeslots yields between 60 and 75 MHz of total digitized RF on each SeRF Small

Form-Factor Pluggable (SFP) laser connection (single fiber pair).

The available RF bandwidth per timeslot is shown in Table 5.

For example, a user who wishes to transport PCS A block, Cellular A, and AWS B

block, the system would require the following:

PCS A 15MHz, 3 timeslots

Cellular A 10MHz, 2 timeslots

AWS B 10MHz, 2 timeslots

__________________________

Total = 35MHz, 7 timeslots

Each fiber pair supports 12 timeslots, or up to 75 MHz of bandwidth. Table 5 shows

the maximum bandwidth versus the number of timeslots.

If more than 70 MHz is required per Remote, up to three additional fiber pairs can

be brought to the Remote to get up to up to 280MHz per Remote (or 300MHz if all

four are GSM-1800).

Table 5. Available RF Bandwidth

Number of

Timeslots

Maximum Contiguous

RF Bandwidth (MHz)

Classic

DARTs

Single and Dual

SuperDARTs

1 5 6

2 12.5 12

3 20 18

4 25 25

6 35 39

8 --- 45

12 --- 60-75