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September 1999 P/N 880-503284-001-A1 - page 29 / 65





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Allows selection of any of five complete configurations which all use CSU mode (no DIU 21xx) and vary according to framing and line coding on EQ and Net sides.

Canned configuration #1, EQPT=SF/AMI Canned configuration #2, EQPT=ESF/AMI Canned configuration #3, EQPT=SF/AMI Canned configuration #4, EQPT=SF/B8ZS


Canned configuration #5, EQPT=ESF/B8ZS


Menu Option

C1-C5) canned config



S) save csu config

Stores the current CSU configuration.

Configuration information for other modules in the node can be saved in non-volatile RAM in the NCC 2020.

Q) restore csu config Restores stored configuration.

If the configuration for a module has been previously stored, a replacement module can be placed in the same slot and sent the stored configuration.

A) diu bus

Selects both the Mode” in which the CSU will operate (CSU, Mux or Drop and Insert) as well as which midplane data bus, if any, will be used to exchange data with any DIU 21xx modules.

(1)NONE — no data bus, CSU is in CSU mode. (2)A — Mux mode using data bus A. (3)B — Mux mode using data bus B. (4)C — Mux mode using data bus C.

(5)B,D&I EQ — Drop and Insert mode toward equipment (some DSX-1 timeslots routed to LOCAL DIU) rarely or never used.

In Mux mode, the NCC 2020 EQPT LED is always green.

(6)A,D&I NET — Drop and Insert toward the Net (some network timeslots routed to DSX-1 port, some others to one or more DIU modules). This is typical Drop and Insert.

B) diu clock

Selects the source of the Transmit Clock used by the CSU to transmit data toward the T1 network.

Note that in CSU mode (DIU Bus = NONE), this option is ignored, the NCC 2020 performs as though THRU timing were selected.

In Drop and Insert mode, use of THRU timing is suggested.

In Mux mode, if the far end CSU is set for INT clock or if the carrier is using a DACS to provide a clock, then NET (recovered network clock) is required.

(1)THRU — The CSU derives transmit clock from the transmit datastream of the DSX-1 equipment, automatically selected in CSU mode, recommended in Drop and Insert mode, and invalid in Mux mode.

  • (2)

    INT — The CSU uses an internal oscillator to generate a

    • 1.544

      MHz clock. Used only in Mux mode, and then only at

one end of a T1 on which the carrier uses no DACS.

(3)EXT 422 — The CSU uses a balanced clock signal provided by an external source through the DIN connector on the rear connector module.

(4)EXT TTL — The CSU uses an unbalanced (0V to +5V) clock signal provided by an external clock source through the DIN connector on the rear connector module.

(5)NET — The CSU uses the clock recovered from receive data on the T1 network port for the transmit clock, this is most often the desired option in Mux mode and is required if the network provides a clock (uses a DACS).

(6)EQ — The CSU recovers the DSX-1 T1 transmit clock to time the network transmit.

(7)TIU — The CSU uses a clock on data bus C produced by an optional TIU 2850 module installed in the same shelf.

(8)DIU — The CSU uses a clock provided by DTE connected to a data port on a DIU 213x module. Tail circuit timing requires this option.

Verilink NCC 2020 User Manual


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