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September 1999 P/N 880-503284-001-A1 - page 30 / 65





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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.

Menu Option

P) prm

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.

Determines whether or not alarm messages are presented.

(2) no — far-end polling is not supported. 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.

Exit this menu.

Returns to the NCC 2020 Main Menu.

O) poll far end

G) Alarm

X) exit menu


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 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. 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 A, B or C. A typical use of Mux mode would be for data-only applications.


Verilink NCC 2020 User Manual

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