TxPORT Transport PRISM 3021, Руководство пользователя

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4-16 Terminal Operation
PRISM 3021
P
ORT
C
ONFIGURATION
The Port Configuration screen (Figure 4-15) sets the operat-
ing parameters for the high-speed port. The unit does not
allow conflicting configurations for the DTE ports. There-
fore, the selections for each menu item are restricted to
those that do not conflict with the configuration of the other
port. The default is all channels disabled.
When channel assignment changes are made to the high-
speed ports, the remote communication link, or the E1-DTE
port, the 3021 reestablishes the mapping of all channels.
This interruption to traffic normally results in a brief burst
of data errors on other ports.
Channel Allocation: This display-only field indicates the
network channel assignments with Channel 1 on the left and
Channel 31 on the right.
Non-assigned idle channels are marked with a dash (-).
Remote communication channels are marked with an R.
Port numbers are used to represent channels assigned to the port.
When channels are assigned to a port in the Alternate assign-
ment mode (see DS0 Channel Assignment below), each data
channel is followed by an idle channel that is not assignable for
other ports and is marked with an X.
E1-DTE channels are shown with a D.
Channel 0 is always reserved for framing and does not appear
on the screen. Channel 16 is an S for signaling if CAS framing
is selected. If CAS is not selected, channel 16 is available for
other use.
Port #: The port number is always ONE.
Port Type: This field shows the type of DTE port: V.35 or
EIA-530. This field is controlled by the hardware.
Rate Multiplier: The unit can operate at any data rate that
is a multiple of 56 or 64 kbps. When Nx64K is selected, the
ones-density requirements of the E1 network line must be
ensured. When Nx 56K is selected, the unit maintains ones
density for the selected DS0 channel.
DS0 Channel Assignment: This field selects whether the
DTE channel assignment are made as a Contiguous group
or as Alternate channels. Selecting Alternate assures ones
density but reduces the available bandwidth from 1.984
kbps to 1.024 kbps.
Start Channel #: The starting channel in the 32-channel
bit stream must be selected in this field. The unit then
assigns the following channels automatically according to
the bit rate multiplier and the mode selected in DS0 Channel
Assignment. The choices are 1 through 31.
Figure 4-15 Port Parameters Screen
3021 DSU 1.00/1.01 P R I S M 3 0 2 1 Date: 03/15/96
No Far End Response Time: 13:53:19
--------------------------- PRISM Port Configuration -------------------------
Channel Allocation: 1111111 DDDDDDDD SDDDDDDD DDDDDDDD
Port # [ONE ]
Port Type: V.35 LL Detect : [Disable]
Rate Mult: [N x 64k] RL Detect : [Disable]
DS0 Ch. Assign: [Contiguous] V.54 Loop : [Enable ]
Invert Data: [No ]
Start Ch. #: ( 1) CTS Control: [Force True ]
Port Rate: [448 kHz ] DSR Control: [Force True ]
# of Channels: 7 DCD Control: [Force True ]
Tx Clock: [Internal ] Alarm On DTR Loss: [Disable]
----------------------------------- Messages ---------------------------------