ADCP-50-304 • Issue 19 • June 1999 • Section 2: Functional Description

FRONT PANEL

BACKPLANE

CONNECTIONS

CONNECTIONS

 

J1 DTE-A

 

A

COMPUTER

B

J2 DTE-B

MODEM

J3 DCE

LED/ALARM

ELECTRONICS

(PSM-01

ONLY)

1607-A

MONITOR

Figure 2-1. PatchSwitch with In-Line Access (PSM-01, PSM-02)

3 A/B SWITCHING WITH OFF-LINE MONITOR ACCESS

The capability for accessing the off-line DTE device is illustrated in Figure 2-2. The upper port

(A)provides patch cord access to the upper “D” subminiature connector (J-1) on the chassis rear panel. When the module is in the “A” or normal state, this provides a monitor function. If the module is in the “B” or “sub” state, this provides direct test access to the off-line device.

The middle port (B) functions in the same manner for the middle connector (J-2) on the chassis backplane; “B” state, monitor access. “A” state, test access to the off-line “B” device.

The lower port (C) provides “intrusive” test access to the lower (J-3) connector on the chassis backplane. Insertion of a patch cord in this port, regardless of switch status, breaks the circuit and connects the patch cord to the common (DCE) device.

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© 1999, ADC Telecommunications, Inc.