Adtran TRACERT1L7 Manual Do Utilizador
61280.003L1-1B
P
AGE
5
4/12/99
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.
“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
NTERFACE
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.”
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
INE
B
UILDOUT
OR
LBO
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.
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.
T
RACER
D
ESCRIPTION