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

 

 

 

A/B SWITCH CONTROL

CONTROL

 

TOGGLE

A

A/B

A/B

 

MODULE

 

 

SWITCH

 

 

 

SWITCH

B

RELAYS

 

 

 

LOGIC

 

 

 

 

 

 

 

 

 

 

 

A/B

 

 

 

A

 

 

INTERLOCK

 

 

 

 

 

JUMPER

 

 

 

B

 

 

GROUP 1

 

 

 

 

 

2

 

 

 

 

 

A/B

TO CHASSIS

 

 

 

3

 

 

 

RELAYS

 

 

 

BACKPLANE

 

 

 

 

 

 

 

 

4

 

 

 

 

 

 

 

 

 

 

V

 

 

 

 

 

 

VERTICAL

 

 

 

 

 

 

INTERLOCK

 

 

 

 

 

A/B

 

 

UPPER

 

 

 

RELAY

 

DTE

 

 

 

 

 

INTERFACE

 

 

 

 

 

(A)

 

 

 

 

 

PORT

 

 

 

 

 

 

 

 

 

 

 

DTE

 

 

 

 

 

 

(B)

 

 

 

 

 

 

 

LOWER

 

 

 

 

 

DCE INTERFACE

 

 

 

 

 

 

PORT

 

 

 

 

1613-A

 

 

Figure 2-8. A/B Switching Module Simplified Circuit Diagram

5 LED/ALARM PATCH MODULE WITH A/B SWITCHING AND OFF-LINE ACCESS (PSM-04)

This module is the same as PSM-01 except that when it is in the A/B state, the off-line port provides direct test access to the off-line device (see Figure 2-2).

6PATCH MODULE WITH A/B SWITCHING AND OFF-LINE ACCESS (PSM-05)

This module is the same as PSM-04 except it does not have LEDs or Alarm.

7LED/ALARM PATCH INTERFACE (PSM-07)

This PS module provides interface patching together with status and alarm indications. A simplified circuit illustrating patching only is shown in Figure 2-9.

The COMPUTER patch cord jack connects directly to the chassis rear upper interface port. The MONITOR patch cord jack connects directly to the chassis rear lower interface port. The monitoring and alarm circuits of the PS module are shown in Figure 2-10. LEDs show the status of eight RS-232 leads. Each lead has a jumper connection to the alarm circuit control logic. The

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© 1999, ADC Telecommunications, Inc.