363-206-305
Circuit Pack Descriptions
7-20
Issue 3 June 2000
Table 7-2. DS1 Line Code Settings
DS1 Quick Reference Summary
7
Transmit Functions
7
Major transmit functions of the DS1 circuit pack are as follows:
a. Receives four AMI or B8ZS encoded DS1 signals from a DSX-1
b. Receives DS1and NRZ data from each DS1 signal
c. Synchronizes and maps each data signal to a VT1.5 synchronous payload
envelope (SPE)
d. Inserts VT path overhead
e. Multiplexes four VT1.5 SPEs to a byte-interleaved VT-G signal
f. Provides the VT-G signal to an OLIU circuit pack.
Receive Functions
7
Major receive functions of the DS1 circuit pack are as follows:
a. Receives a SONET VT-G frame synchronizing signal from its associated
OLIU
b. Demultiplexes the VT-G into four VT1.5 signals
c. Terminates VT path and the embedded DS1 signal from each VT1.5 SPE
d. Desynchronizes the DS1 signals
e. Encodes each DS1 signal into either AMI or B8ZS format
f. Preequalizes (with line build out) each DS1 and provides them to a DSX-1
as bipolar signals.
DS1 Line Code Settings (Notes)
Line Code
Format
DIP Switch Settings
S1-4
(Port 1)
S1-5
(Port 2)
S1-6
(Port 3)
S1-7
(Port 4)
B8Zs OFF OFF OFF OFF
AMI ON ON ON ON
Notes:
1. Switch section 8 (S1-8) is unused and ignored by the
system.
2. Line code is software overrideable.
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