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LED Status Indicators LED STATUS INDICATOR COLOR SIGNAL DEFINITION A Red DTE-A B Green DTE-B TD Green Transmitted Data RD Green Received Data DCD Green Data Carrier Detect SQ Green Signal Quality Detect RTS Red Request To Send CTS Red Clear To Send DSR Red Data Set Ready DTR Red Data Terminal Ready ALM Yellow Alarm On Table 2-5. Alarm Time Delay Settings ARC LENGTH TIME DELAY 50 HZ AND 60 HZ ENVIRONMENT g 1 .sec Shortest 64 msec 256 msec 0.51 sec 1.02 sec 8.19 sec 32.75 sec Longest 65.5 sec 3.3 Patch Module with A/B Switching and In-Line Patch Access (PSM-02) This PS module operates similarly to the PSM-01 by providing patching, switching, and switch status indication, except it does not contain LED status indicators and alarm circuitry. A detailed circuit diagram of this module is shown in Figure 2-7. Page 2-11 © 1999, ADC Telecommunications, Inc. ADCP-50-304 • Issue 19 • June 1999 • Section 2: Functional Description 4 A/B SWITCHING MODULE (PSM-03) This module provides A/B switching only. A simplified circuit diagram of this module is shown in Figure 2-8. The A/B switch activates the A/B relays. The A/B relays complete the channel between the DCE and either DTE-A or DTE-B. The relays also switch in the interlock jumper. Interlocking from the control module protects the user from accidentally switching common backup equipment onto two or more different data lines. The three classes of interlock groups available are: 1. Global Interlock: Groups 1 and 2 are global and may be extended to all chassis in a system, using a 20-pin interchassis interlock cable. With this grouping, all modules having a jumper placed on group 1 make up one group, and all modules with a jumper on group 2 make up the other group. Interchassis interlock cables must be installed between chassis. Each module interlock group may have no more than one jumper installed at one time. 2. Horizontal Interlock: Groups 3 and 4 are horizontal and they include only modules in the individual chassis. With this grouping, all modules having a jumper placed on group 3 make up one group and all modules with a jumper on group 4 make up the other group. These groupings do not extend out of the chassis and are not affected by the interchassis interlock cable. Each module interlock group jumper block may have no more than one jumper installed at a time. 3. Vertical Interlock: The vertical interlock jumper position is labeled V. Placing a jumper in this position interlocks all modules in the same slot location in other chassis having a jumper installed on the came V position. Interchassis interlock cables must be installed between chassis. The interchassis interlock cable is a 20 position ribbon cable (4WC-03) with a 20-pin connector for each chassis. Each module interlock group jumper block may have no more than one jumper installed at a time. A/B SWITCH LOGIC A/B REPLAYS A/B INTERLOCK JUMPER GROUP 1 2 3 4 VALARM A/B REPLAYS INDICATORS TOGGLE SWITCH A B A B BACKPLANE 1612-A Figure 2-7. Patch Module with A/B Switching Detailed Circuit Diagram Page 2-12 © 1999, ADC Telecommunications, Inc. ADCP-50-304 • Issue 19 • June 1999 • Section 2: Functional Description TOGGLE SWITCH A B A B A/B SWITCH LOGIC A/B SWITCH CONTROL A/B RELAYS A/B RELAYS A/B INTERLOCK JUMPER GROUP 1 2 3 4 V CONTROL MODULE A/B RELAY VERTICAL INTERLOCK TO CHASSIS BACKPLANE DTE (A) DTE (B) DCE UPPER INTERFACE PORT LOWER 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). 6 PATCH 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. 7 LED/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 Page 2-13 © 1999, ADC Telecommunications, Inc. ADCP-50-304 • Issue 19 • June 1999 • Section 2: Functional Description alarm is thus user selectable for any one of eight leads of the lower patch port. The EIA RS-232/ CCITT V.24 modem interface signal leads are shown in Table 2-3. The alarm circuit control logic supplies the alarm signal to the control module and an alarm indicator. This logic is also controlled by the RST (Reset) touch switch, toggle switch OFF (LED off, audible alarm off), ALM (LED and audible alarm on), LED (LED on, audible alarm off), and rotary switch DLY (ala...

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