GDSFs can be configured to provide GDG transceiver circuits.
Two TTFs can be assigned in an SM if the SM is equipped with two global digital service units (GDSUs). Thirty-two
GDSFs can be assigned in an SM-2000 and one or two GDSFs are available in an SM. Any number of SMs can be
equipped with TTFs or GDSFs. To make use of the additional TTFs or GDSFs, ROTL ports would have to be
assigned across the respective SMs.
Other ROTL functions are determining the test call instructions, seizing the trunk, and causing outpulsing over the
trunk under test to the distant office.
7.2 EQUIPMENT
In the
5ESS
®
-2000 switch, the ROTL hardware functions are provided by the TTF or GDSF. The TTF is a group of
circuit packs in the global DSU and the GDSF is a unit in the DSU3 or CSU. These circuit packs are not provided
exclusively for ROTL, but ROTL utilizes the capability provided by this hardware to perform its functions. The ROTL
software uses the TTF and GDSF to perform the following functions:
Detect tones from CAROT (not MF-priming digits)
Perform call disposition analysis for the trunk under test
Perform measurements, encode the results, and send them to CAROT
Send a detailed error code to CAROT in response to a ring forward
Internally connect a digital path from the trunk under test to the CAROT path.
The TTF and GDSF accesses voice-frequency channels only through the bit stream as provided over the peripheral
interface data bus (PIDB). Direct control resides within the module controller of the module in which it is located, and
such control is exercised by software interaction over the peripheral interface control bus (PICB).
7.3 TRUNK CONDITIONING
7.3.1 GENERAL
The CAROT Test Center can perform the following functions:
Perform a security callback
Remove trunks from service
Restore trunks to service
Request the status of a trunk or group of trunks [in-service or out of service (locked out or disabled)].
These functions are requested by the test center via MF commands.
7.3.2 TRUNK MAKE-BUSY AND RESTORE
When the
5ESS
®
-2000 switch system software receives a request to make a trunk remote maintenance-busy or a
request to restore the trunk to service, the response is as follows:
(a)
A determination is made whether or not authorization has been established for the make-busy or restore
request. If authorization has not been established (that is, a security callback has been performed), a
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October 1999
Copyright © 1999
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Summary of Contents for 5ESS-2000
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