Black Box 5000 manual This menu offers the following test options

Multiserver 5000

This menu offers the following test options:

Option	Description
Sync	Causes a sync port to be placed in
Channel	local echo loopback similar to the
Loopback	async echo.
	WARNING: This test will interrupt
	all channels connected across the
	link.
Remote	Sets up the unit to expect its own
Composite	databack. This function is required
Loopback	for tests intiated by external
	communication devices (modem or
	CSU/DSU) or telco.
	WARNING: This test will interrupt
	all channels connected across the
	link.

LED Test	Lights all of the indicator lights
	(LEDs) on all modules for five
	seconds.
Monitor Ch.	CCM indicator lights display the
Interface	status of the interface signals. See
Signals	Figure 13.4.
Terminate	Terminates all tests initiated at this
Test	menu (except LED Test, which
	automatically terminates).

Once a test is initiated, an [Active] message is

displayed on the LCD. All tests (except the LED Test) remain active until terminated with Terminate Test. The next time you cycle through the LCD Menus, an [Active] message is displayed, meaning the test was previously invoked and is still active. When a test is complete or is terminated, the LCD will display [Inactive].

VOICE/FAX

When this menu is selected, the screen will prompt for the channel number to be tested. If a voice/fax module is installed in the Multiserver, the following diagnostic options will be offerred:

Option	Description
Self-Test	Verifies that the memory and analog
	circuit of the voice/fax channel is
	working properly. When this test is
	initiated, the display will read
	[Started]. Press the EXEcute key
	again to ascertain the status of the
	test (Passing/Failing).
Local Loop	Causes the voice/fax channel to
	compress the local speech signal,
	and then passes this signal through
	the reconstruction process back to
	the local receiver. It sets the
	voice/fax channel to the off-hook
	condition during the test. When this
	test is initiated, the display will read
	[Active].
Input Level	Monitors the level of the incoming

AT BO A6 A5 A4 A3 A2 A1

RTS DTR Busy* Pin 11* CD DSR RI CTS

*Not used on links.

Figure 13.4 “Monitor Channel Interface Signals” Test.

172