Verilink PRISM 4001 (34-00244) Product Manual - Manual (Page 27)

Terminal Operation 4-7 PRISM 4001
DDS Network Parameters
The DDS Network Parameters screen (Figure 4-9) allows
the user to review and set line parameters for the selected
element on the DDS circuit. The fields in this screen, all of
which have user-selectable options, are discussed below. To
send the new line configuration to the 4001, either press
ENTER on one of the fields, change the Element selection,
or exit the screen.
R ATE
Selects the network interface line rate. The 4001 must be
manually set to a specific line rate. The rate choices are: 2.4,
4.8, 9.6, 19.2, 38.4, 56, and 64 kbps.
D ATA M ODE
When set to TxPORT, the 4001 operates in proprietary
mode (TxPORT equipment must be located on both ends).
When set to STANDARD, the 4001 operates in industry-
standard mode (it interoperates with equipment from
another vendor).
T IMING
The DSU can source its timing from three choices: NET,
DTE, and INT. With NET selected, timing is derived from
the network recovered clock (the normal DDS mode). With
DTE selected, the 4001 synchronizes to the clock recovered
from the DTE port. With INT selected, the internal oscilla-
tor frequency is the standard for all timing. DTE timing is
allowed only in Standard mode.
C IRCUIT A SSURANCE
This option allows the CTS control lead to respond to the data
signal from the network. If ON is selected, the 4001 turns the
CTS lead OFF when receiving idle code (for example, if
DCD is OFF). If OFF is selected, the state of the CTS control
lead is not affected by data signal from the network.
A NTI -S TREAMING T IMER
This timer is used to prevent a streaming DTE, on a tribu-
tary DSU in a multi-point circuit, from locking up the cir-
cuit. If the RTS lead from the DTE stays constantly active
for the anti-streaming time, the 4001 shuts off data transmis-
sion into the network. Whenever RTS goes inactive, the
anti-streaming timer is reset. The timer can be turned OFF
or set for 10, 30, or 60 seconds.
Figure 4-11 Network Parameters
4001 DSU x.xx/x.xx PRISM 4001 Local Screen
4001 DSU x.xx/x.xx Unit Address: X
-------------------------- NETWORK PARAMETERS --------------------------
Element: [NEAR]
Rate: [56K ]
Data Mode: [STANDARD]
Timing: [NET]
Circuit Assurance: [OFF]
Antistreaming Timer: [OFF]