ASAHI KASEI
[AK2500B]
FUNCTIONAL DESCRIPTION
The AK2500B provides the basic receiver functions of a high-speed line card as shown in Fig.7.
The receiver extracts data and clock from a B3ZS coded signal and outputs clock and synchronized data.
Signal Requirements
Pulse characteristics are specified at the DSX-3.
Table 1. DS3 Interface Specification
Parameter
Line Rate
Line Code
Test Load
Standards
44.736Mbps±20ppm
B3ZS
75
Ω±
5%
GR-499-CORE , ANSI T1-102 , T1.404
Specification
Table 2. STS-1 Interface Specification
Parameter
Line Rate
Line Code
Test Load
Standards
51.840Mbps±20ppm
B3ZS
75
Ω±
5%
GR-253-CORE , ANSI T1-102
Specification
Equalization
The incoming data may have the loss of cable and/or flat. Cable type and length from the cross-connect are
specified as shown in Table 3. Equalizer compensates appropriately for a nominal DSX-3/STS-1 pulse as
attenuated by 0 - 450 feet of 728A cable.
Table 3. DS3/STS-1 Cable Specification
Parameter
Cable Type
Cable Length
Specification
Type 728A coaxial cable (or equivalent)
0 – 450 feet (from DSX-3 point)
MS0005-E-00
-5-
1999/12
AKM [ ASAHI KASEI MICROSYSTEMS ]
