Ds1/Dsx-1 Interface; Line Buildout Or Lbo - ADTRAN TRACER User Manual

61280.003L1-1B
For the T1 receiver to operate correctly, a minimum number of
"1s" must exist on the T1 facility. If the data cannot be guaranteed
to meet this requirement, then another line coding format is used.
In the bipolar 8 zero substitution (B8ZS) scheme, a string of eight
"0s" is replaced by a special sequence of eight bits that contains a
bipolar violation. The receiver, upon recognizing this sequence,
reinserts the eight "0s" and the data is recovered intact.
DS1/DSX-1 I
When connecting the interface to the public switched network,
an ADTRAN-provided cross-over cable (part number
3125.M011@A) is required to meet FCC part 68 and IC CS03
requirements. This cable is required to cross-over the Tx and Rx
pairs to meet the connecting arrangement of a network interface
device. This cable is included with the BBP and is labelled "T1
Crossover."
L B
INE UILDOUT OR
The DS1/DSX-1 interface provides two different types of line
buildouts (LBOs), respectively. When set for DS1, LBOs for 0 dB,
-7.5 dB, -15 dB, and -22 dB are available. The DS1 interface can
operate on line lengths up to 6,000 feet. When set for DSX-1
interface, LBOs for 0-133 feet, 266-399 feet, 399-533 feet, and
533-655 feet are available.
4/12/99
NTERFACE
LBO
P 5
AGE
T D
RACER ESCRIPTION