Digital Link DL3800 DS1, Руководство пользователя

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4-22 DL3800 DS1 Inverse Multiplexer User Guide—February 1999
4
Primary Clock Source This allows the user to select either the Primary Clock Source, transmit (xmt),
and receive (rcv) for the individual T1 network ports.
To change the present Primary Clock Source, use the up and down arrow
keys to highlight either
Xmt
or
Rcv
on the Primary Clock Source line, and
use the Space Bar to toggle between the choices. For Xmt (transmit) the
choices are Network (
NET
), External (
EXT
), and Internal (
INT
). For Rcv
(receive) the choices are
Net-1
through
Net 8
(each of the individual T1
network ports), or Auto (the unit selects the best source).
The DL3800 can use several sources to generate the transmit clock. The
Internal selection uses an oscillator within the DL3800, the Network setting
recovers the clock from the selected T1 line, and the External setting
recovers the clock from the dB-9 Ext. Clock connector on the rear panel of
the unit. Typically, the clock source on one side of the link is set to Internal,
and the other is set to Network. (Default - Smt: Int., Rcv: Net 1)
Secondary Clock Source This allows the user to select either the Secondary Clock Source, transmit
(xmt), and receive (rcv) for the individual T1 network ports.
To change the present Secondary Clock Source, use the up and down arrow
keys to highlight either
Xmt
or
Rcv
on the Secondary Clock Source line, and
use the Space Bar to toggle between the choices. For Xmt (transmit), the
choices are Network (
NET
), External (
EXT
), and Internal (
INT
). For Rcv, the
choices are
Net-1
through
Net 8
(each of the individual T1 network ports)
or Auto (the unit selects the best source) until the desired choice appears.
(Default - Xmt: Int, Rcv: Net2)
DSU Mode This allows the user to set the DL3800 up as a DSU, with one DTE, and one
Network port.
To change the present DSU Mode level, use the up and down arrow keys to
highlight the
DSU Mode
item, and use the Space Bar to toggle between the
following selections until the desired choice appears:
Inverse MUX
(standard operation) or
Single T1 DSU
. Highlight
Confirm
, and press the
Enter
key to confirm the change. (Default-Inverse Mux)
Suppress Yellow Detect This item allows the user to configure the unit to ignore or report yellow
alarm conditions when in D4 framing.
To change the present Suppress Yellow Detect, use the up and down arrow
keys to highlight the item, and use the Space Bar to toggle between
Enabled
and
Disabled
until the desired choice appears. Highlight
Confirm
, and press the
Enter
key to confirm the change. (Default -
Disabled)
Table 4-7 NETWORK CONFIGURATION MENU Options (Continued)
Parameter Description/Action