Functional Description; Oc3 Circuitry - Pulse O3-4D1L3 U2 Manual

3. FUNCTIONAL DESCRIPTION

A. OC3 Circuitry
Surge
- -48 VDC
Protection
Input
Alarm
Relays
Frame Ground
Up to four DS1 circuits are combined into a single OC3 signal by using VT1.5 and STS-1
mapping; DS1 numbers 1, 2, 3, and 4 are mapped into STS-1 VT1.5 #1 positions 1, 2, 3,
and 4, respectively. The DS1 payload is not modified. Figure 3 shows a functional block
diagram.
The optical interface for the 155 Mbps data stream conforms to the basic SONET structure
defined in GR-253-CORE.
Power
Converter
Instant
Default
Switch
Figure 3. O3-4D1L3 Functional Block Diagram
Transformers
T1
LIU
Surge
Protection
OC3 Framer
VT1.5 Mapper
T1 Framer
CPU
EEPROM
5
O3-4D1L3 U2
1631, Issue 4, October 2009
DS1
24-Pin
OC3
LC
RS-232
DB9
Driver
LEDs
DIP Switch