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The loopback test can be used to verify that the ACC hardware
and software have been properly installed, and are functional. | | | |  | NOTE: This test assumes that at least one ACC multiplexer
card will be used. If no multiplexer cards will be used on the system,
refer to the section “Systems Without Mux Cards”. | | | | |
Loopback Configuration Requirements | |
The ACC product
provides a loopback protocol module (PORTTEST) which
is included in the download file. This can be used to run a loopback test
which exercises the ACC multiplexer card, any attached multiplexer interchange
panel or cable, and the specified multiplexer port. The loopback
test is run using the loopback test feature (the lb command of the zmntr utility.
(See the ACC Utilities Reference Guide.) The test requires the following: At least one ACC
Mux card must be installed into the system, and it must have a multiplexer
interchange panel (or output cable if the card is 2-Channel) attached. The ACC product must be installed and the system
must have been rebuilt and rebooted. The external loopback test, which can be used to test a specific
port, requires that a loopback hood be attached to that port. (If
a loopback hood is not available, an internal loopback test can
be run which just exercises the interface card.) For dual interface configurations, only one ACC
multiplexer card should be attached to the multiplexer panel at
a time.
| | | | | NOTE: The 4-channel E1/T1 and 8-channel PCI ACC cards do not
require any configuration to perform the ZMNTR "LB" loopback test,
with the exception that a loopback hood must be connected to a port
in order to run an "External" loop test. This section of the manual
does not apply for these card types. | | | | |
Cabling and Clock Source RequirementsWhen testing a single port looped back on itself, you connect
a terminated connector or loopback hood to one of the ports on either
the multiplexer panel or the (2-Channel) output cable. This serves
to connect the Receive Clock (RC) to the External Timing Clock (ETC),
or CCITT circuit 115 to CCITT circuit 113. Refer to the hardware
reference manual for more details. | | | | | NOTE: A Loopback hood and cable is supplied with the Interchange Panel
or Cable accessory. | | | | |
For this type of loopback test, the Internal clock
mode is required. (See the ACC Utilities Reference Guide for
a description of valid ACC clock modes.) Referring to the sample
configuration files in Appendix A “Files, Utilities, and Daemons” of this manual,
note that the Port-Definition statements, which are automatically
generated during installation, define clock mode for even-numbered
ports as “Int”, and for odd-numbered ports as “Ext” or
external clock mode as follows: Port-Definition
Port 0:0 RS232 57600 Int SDLC x1 NRZ
Port 0:1 RS232 57600 Ext SDLC x1 NRZ
Port 0:2 RS232 57600 Int SDLC x1 NRZ
Port 0:3 RS232 57600 Ext SDLC x1 NRZ
Port 0:4 RS232 57600 Int SDLC x1 NRZ
Port 0:5 RS232 57600 Ext SDLC x1 NRZ
Port 0:6 RS232 57600 Int SDLC x1 NRZ
Port 0:7 RS232 57600 Ext SDLC x1 NRZ
Port 1:0 RS232 57600 Int SDLC x1 NRZ
Port 1:1 RS232 57600 Ext SDLC x1 NRZ
| | | | | NOTE: If you are using an 8-port PCI
card with an external loopback cable, you need to specify the clocking
parameter "ExIn" for an external DTE configured
port. | | | | |
If you intend to test a single port looped back on itself,
it is convenient to choose one of the predefined even-numbered ports,
since the configuration file provides the required clock mode. Alternatively,
edit the loopback.answ configuration
file to reflect your needs. The .answ file is generated with entries
for an RS-232 panel, if you are using a different panel type (e.g.
RS-449, X.21, V.35), you must edit the loopback.answ and set the
port mode as appropriate for the specific card and panel type combination.
Note that the "Ext" clocking may need to be modified
to "ExIn" for other panel types (see note above). If either the .answ or .tmem file does not exist, or no
longer reflects the current location of the hardware, recreate this
file and run ttgen on this file: Do not proceed until ttgen has
been run successfully. More information on using /opt/acc/lbin/acc_bld_lpbk,
a sample loopback configuration file, and an example of running
ttgen is shown in the sections “Configuration Scripts” and “Sample ttgen Configuration File” of Appendix A. Bringing Up ZCOM Mux Subsystem | |
Before any of the features
of the ZCOM Mux Subsystem can be accessed, it must be started up
by running zmasterd (located
in /opt/acc/bin) with an appropriate
.tmem file. The /opt/acc/cfg/loopback.tmem file should be
used, followed by performing the loopback verification test: Messages indicating whether or not the ZCOM Mux subsystem
was started successfully will be logged to the file /var/opt/acc/log/XXX.tlog, where
XXX represents the day of the week (i.e. mon.tlog, tue.tlog, etc.). The following listing is an example of what might be displayed
when the ZCOM Mux subsystem is started successfully. Note that in
this example, the /opt/acc/cfg/loopback.answ file
is configured to start up two mux cards. Zmasterd starts the daemons
that are listed with “start” statements in the /opt/acc/cfg/zmasterd_list file.
For the base ACC product, zmasterd starts the zmlog logging facility, zmon, and znode. If any error is reported during the start up procedure, it
may be necessary to stop the ZCOM subsystem by running: The error should be addressed, and then the ZCOM subsystem
should be restarted. Refer to the ACC Error Guide,
for information on the messages reported by zmlog. Note that file /opt/acc/cfg/zmasterd_list refers
to /opt/acc/cfg/loopback.tmem by
default. If another .tmem file is
be used, you should update this file accordingly. Refer to the ACC
Utilities Reference Guide for more information on the
use of zmasterd. Performing the Loopback Test | |
The loopback test is run by using the lb command
of zmntr utility program. You should run both the internal and external loopback tests (as
well as either the RS-232 or V.35 test on 8-Channel interfaces).
This will verify the following: The ACC Mux card has been properly
installed, and has been recognized by the HP-UX system. The ACC driver software has been configured into
the system properly. The ZCOM Mux subsystem has been started up successfully. The ACC interface card, as well as the mux panel
(or cabling) and the mux ports within that panel can be communicated
with (at least those ports that have been specified in the test).
| | | | | NOTE: The .answ configuration
files provided with the ACC product include the appropriate configuration
for using the zmntr loopback
test. Refer to the ACC Utilities Reference Guide for
more information on zmntr,
its loopback test options, and the related configuration requirements. | | | | |
The following two examples show loopback tests being performed
on port 0 of mux 1 (Z7200A card). In the first example, the port is not connected to a loopback
hood. The i test option is
used which performs internal checks on the interface card only.
In this example, the interface card is good and all tests pass. Example 1 In the second example, both internal and external tests are
performed by using the ie test
option. In this example, the loopback hood is not connected to the
port being tested, and therefore the external tests fail. Example 2 For a 4-port E1/T1 Mux card, the results of these same test
would appear as follows: |
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