Patton electronic 2710 - Manual (Page 20)

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– ESF Data Link: ANSI T1.403 (default)
Options: ANSI T1.403, AT&T TR54016
ANSI T1.403: This ANSI developed standard (see ANSI T1.403-
1995: Network-to-Customer Installation—DS1 Metallic Interface)
uses the FDL to send and receive one second Performance Report
Messages (PRMs). The messages contain the NI performance over
the last four seconds. Thus, up to three consecutive messages may
be lost without loss of information. It is available only with ESF.
When ANSI T1.403 is selected, requests to send AT&T performance
reports (ref. AT&T TR 54016) are ignored
AT&T TR54016: Developed by AT&T, this FDL method differs princi-
pally from the ANSI method in two ways: First, the ANSI method
transmits messages continuously, whereas the AT&T method trans-
mits a performance report only upon a request from the remote end
for a report. Second, the AT&T method provides a historical sum-
mary, up to the last 24 hours, of NI performance. Only the service
provider or special test equipment can send these requests. When
AT&T TR54016 is selected, ANSI PRMs are still transmitted by the
unit, but only PRMs sent by the carrier will be recognized. To receive
PRMs from another customer unit (i.e., in a campus application),
select ANSI T1.403. When the frame is not ESF, the FDL is disabled.
– ESF Carrier Loops: Enabled (default)
Options: Enabled, Disabled
The ESF format provides the CO the ability to put the customer installa-
tion’s NetLink-T1™ into loopback mode. The NetLink-T1™ recognizes
these special messages that are sent over the FDL. When enabled, the
unit will respond to these loopback commands and go into or out of loop-
back mode. When disabled, the unit will not respond, although it still rec-
ognizes the loopback commands. When in loopback, the unit will remain
in loopback until a loopback exit command is received or when the loop-
back timer times out. See “Unit Options” on page 29 to make Loop Time-
out choices. This feature allows the remote user to regain control should
one be locked out after a loopback is initiated.