Verilink NCC 2020 (880-503284-001) Product Manual - Manual (Page 30)

Configuration
3-8 Verilink NCC 2020 User Manual
Mode The CSU portion of an NCC 2020, a TAC 2010 CSU, has three
distinctly different modes of operation. The mode is determined
by the selection for
DIU bus DIU bus DIU bus DIU bus on the Configuration Menu.
CSU Mode In CSU mode, the TAC 2010 does not use any data bus in the shelf
to pass data to any other module. All 24 timeslots in the T1 signal
are passed, unmodified, to the DSX-1 equipment port. In the
transmit direction, the DSX-1 device is the timing source and the
CSU behaves as if THRU timing is selected, despite what the menu
may indicate. Any DIU 21xx modules present in the shelf are
ignored in terms of data flow.
A TAC 2010 (or NCC 2020) is in CSU mode whenever the DIU bus
option is set to
NONE NONE NONE NONE. A typical use of CSU mode would be for
voice-only PBX applications.
Mux Mode In Mux mode, the DSX-1 equipment port is not used. All 24
timeslots of the T1 signal are available for use by some number of
DIU 21xx module(s) assigned to the CSU. The CSU is configured to
use one of the three data busses in the midplane of the shelf. Any
associated DIU 21xx modules use this bus to accept receive data
from and present transmit data to the CSU. The CSU multiplexes
data from up to 24 ports on up to 24 DIU modules into the T1
transmit datastream.
A TAC 2010 (or NCC 2020) module is in Mux mode when the DIU
bus option is set to
AAAA, BBBB or CCCC. A typical use of Mux mode would be
for data-only applications.
P) prm Performance
Response Messages
may optionally be
sent in the 4K FDL
portion of an ESF
framed T1.
1(NO) — Performance response messages received from the
network are ignored, no messages are sent.
2(USER) — Performance response messages are allowed
responses and information stored in the user ESF registers
is made available. Used by pro-active carriers.
O) poll far end If enabled on a point-
to-point ESF T1, far-
end polling can
monitor alarms at a
remote CSU.
(1) yes — far-end polling is used, requires FDL continuity
from end to end, a DACS in the T1 usually terminates the
FDL making this unusable, note that ESF is required to use
this option.
(2) no — far-end polling is not supported.
G) Alarm Determines whether
or not alarm
messages are
presented.
0(Disable) — Alarm reporting is turned off.
1(Enable) — Alarm reporting is enabled, messages will
appear on the Craft terminal as alarms occur and clear.
X) exit menu Exit this menu. Returns to the NCC 2020 Main Menu.
Menu Option Description Instructions