ADTRAN T3SU 300, Руководство пользователя

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Chapter 3. Configuration
61202217L1-1B T3SU 300 User Manual 53
F
RAMING
Select the framing format for each individual DSX-1 interface. The
default setting is
ESF
. Select
ESF
if your DTE device is configured for
Extended Superframe framing. Select
D4
if your DTE device is
configured for D4 framing. Select
A
UTO
to allow the interface to detect
the framing type (ESF or D4) automatically. When in A
UTO
mode, the
selected interface toggles between ESF and D4 approximately every ten
seconds until it detects valid framing.
Note: D4 is equivalent to superframe format (SF).
L
INE
C
ODING
Set the line code for each individual DSX-1 interface to match the
connected DTE device. Three choices are available: B8ZS, AMI, and
AMI
W
/
STUFFING
(AMI coding with bit stuffing).
L
INE
L
ENGTH
Set the line length for each DSX-1 interface according to the distance
from the T3SU 300 to your DTE device. Set to 7.5 dB if the attached
DTE device only supports DS-1 levels.
DSX-1 T
IMING
S
OURCE
For each Quad DSX-1 card pair (the near- and far-end Quad DSX-1
cards), there must be only one source of timing. The available timing
sources are described below:
DS3
: The timing for both the near- and far-end Quad DSX-1 cards is
derived from the DS3 interface. All DTE devices connected to the
DSX-1 interfaces must be slave timed since both cards source the timing
reference derived from the DS3. Both the near- and far-end units must
be set to DS3.
R
EMOTE
: The timing source for the Quad DSX-1 card is derived from
the far-end Quad DSX-1 card. Use this mode if the far-end card has a
DSX-1 T
IMING
S
OURCE
configuration of DSX-1 #1, DSX-1 #2, DSX-1 #3,
or DSX-1 #4.
DSX-1 #
X
(x is 1,2,3, or 4): The timing source for the Quad DSX-1 pair
is derived from one of the four DSX-1 interfaces. When configured in this
manner, one of the DSX-1 interfaces is slaved to the DSX-1 interface
from your DTE. The remaining three DSX-1 interfaces, if enabled,
source the timing as derived from the slaved port. The far-end DSX-1
interface must be configured for R
EMOTE
.
Note: If more than one Quad DSX-1 card is installed, each card can
have a different timing source configuration.
A
PPLY
S
ETTINGS
Select this field after making all configuration changes for the selected
port. The changes are then applied to the unit immediately.
Table 3-3. DSX-1 Interface Port Configuration Selections (Continued)
Selection Description