| |
|
|
This chapter includes procedures to:
- Install chassis cables
- Set rotary and toggle switches
- Reinstall EMI shelf cover
Customer Supplied Cables
Customer supplied cables are those cables that connect the SSR bay modules to the customer's equipment. All customer supplied cables must be available at the time of installation. Refer to Figure 4-1 for a list of customer supplied cables.
Avici Supplied Cables
Avici includes a kit of external cables (for use in troubleshooting) with each bay. These cables allow console access into each of the SSR bay components.
.
Ethernet Cable Specifications
The Ethernet cables required include a Category 5 cable with an RJ-45 connector for connecting to the network management station. This straight through, shielded connector is a standard Category 5 patch cable. .
Fiber Cable Routing
Single or multi-mode optical fiber cables provide the interface between router module and customer equipment.
Fiber optic cables route to router modules via external vertical cable channels and horizontal cable trays on the SSR chassis. In addition, cable management brackets on the router modules allow easy dressing and organization of fiber optic cables. Good organization of fiber optic cables allows easy installation and removal of router modules during operation.
Fiber Management Frames
The customer is responsible for purchasing and installing the fiber management frame for their fiber optic cables.
We recommend Siecor Fiber Management System for overhead cable routing of multiple system configurations.
Installing Module Cables
The following cabling applies to a minimum system configuration consisting of one route controller module and four router modules.
The cables required for route controller module connections include:
- Two Category 5 100BaseT Ethernet cables to connect to two router modules
- One Category 5 10BaseT Ethernet cables to connect to one bay controller module
- One Category 5 10BaseT Ethernet cable (customer supplied) to connect to an external network management system
The cables required for router module connections include up to eight fiber optic cables to connect the router module to customer equipment.
Installing Route Controller Module Cables
Route controller module and cable kits ship separately. Refer to the documentation that is packed with your route controller for installation information. The cable kit sent with each route controller includes the following:
Bay Controller Backplane
Ethernet cables connecting the bay controller backplane to the route controller connector panel ports (see Figure 4-1) are installed during manufacturing.
The SSR bay controller backplane interfaces between:
- Bay controllers and cooling modules
- Bay controllers and module backplanes (for communication between route controller and router modules)
- Bay controllers and the BIP (for monitoring power and alarm LEDs)
- Bay controllers in adjacent chassis (dual chassis systems only)
Figure 4-1. Route Controller Connector Panel Ports
Chassis Numbering
The bay controller backplane in the rear of the chassis includes a rotary switch and a toggle switch for setting the position and the number of each SSR chassis (see Figure 4-2). The toggle switch indicates the chassis position (top or bottom) and the rotary number indicates its number in the configuration.
When connecting SSRs in a top/bottom configuration, the toggle and rotary setting must be set as shown in Figure 4-3 and Table 4-4. For example, the bottom chassis is in position "0" and is numbered "1," and the top chassis would be in position "1" and is numbered "1."
Figure 4-2. Toggle and Rotary Switch Location
Figure 4-3. Toggle and Rotary Settings
For example, the bottom chassis is in position "0" and is numbered "1," and the top chassis would be in position "1" and is numbered "2."
Table 4-4. Chassis Numbering Chassis Toggle (SW2) Rotary (SW1) First Chassis
0
1
Second Chassis
1
1
PROCEDURE: Use the following steps to set the bay identifier switches for a bottom (0) chassis location:
Step 1 Set toggle switch to "0."
Step 2 Set chassis number SW1 rotary switch to "1."
Grounding Communication Links
The SSR chassis uses three main types of communications cables:
- Fiber-optic cables
- Twisted-pair Ethernet cables
- Coaxial cables
CAUTION (C:4-1) In a system with an Isolated Bonding Network (IBN) grounding topology, take care that communications cables going into and out of the system do not violate the topology. Links must be isolated to avoid signals being referenced to different ground potentials that can cause signal errors or damage to circuitry.
Potential differences can occur when signals and/or shields are connected to different ground references. This requires specific installation measures to offset possible risks or violations.
NOTE The installation measures that must be taken to eliminate different ground references are beyond the control of the supplier of the equipment or the installer. These measures are in reference to the grounding topology of the customer's central office. Customers have different methods of supplying and connecting these site specific grounds. This statement is intended only as a reminder to customers that there are possible risks involved when connecting to different ground sources.
For additional information on grounding network-communication links, refer to the International Telecommunications Union standards ITU-TS.
Central Office Alarms
This section describes "Central Office Alarms" for the SSR. These alarms set off audible and visual indicators in the Central Office (CO), as well as bay LEDs, see Figure 4-4.
When connected at the CO central office alarms report the occurrence of events such as a component failure. Alarms originate in either a bay controller or route controller.
The alarm task resides in the bay controller and is responsible for setting and clearing of alarms as well as maintaining an alarm database. A DB-15 connector on the SSR bay lets you connect the visual and audible alarms to your central office system.
CO Alarm Levels
There are three levels of central office alarms:
- Critical
- A critical alarm indicates the occurrence of a severe, service-affecting condition and requires immediate corrective action. Two Bellcore examples of a Critical alarm would be either a fire or an access transport entity (DLC), which must generate a critical alarm if 128 access lines are out of service.
- Major
- Major alarms indicate serious hardware or software conditions such as disruption of service or failure of an important circuit. A major alarm requires immediate attention to restore full system performance, but has less immediate impact on service or system operation than a critical alarm. Bellcore's example for a Major alarm, is a Public Packet Switch Network (PPSN) trunk "declared link failure."
- Minor
- A minor alarm indicates a problem that does not have a serious affect on service to customers or indicates trouble with a circuit that is not essential to system operation. Bellcore's example of a Minor alarm would be all non-service affecting issues, such as, a line carrier problem where transmission was switched to a protection line.
Bellcore GR-474-CORE states that each trouble requiring a crafts person action shall result in an alarm condition and shall be reported by three concurrent methods:
CO Alarm LEDs and Audible Bells
The CO alarms are both visual and audible. Three labeled LEDs located on the SSR chassis visually display alarms signals. See Figure 4-4.
Figure 4-4. Central Office Alarm LEDs
On the SSR, the critical and major LEDs are red; the minor LED is amber. LEDs remain lit until all detected events are cleared.
Whether the alarm signal originates from the route controller or bay controller, the appropriate LED, or visual and sound combination in the central office will activate. Logging of messages occurs when an alarm is activated.
IPriori provides CLI commands to silence alarms that are sounding, to display alarms, and to test the SSR bay LEDs. For more information about IPriori and CLI commands for the CO alarms, see "IPriori Configuration Guide."
Installing Remote Central Office Alarm Cables
To install the CO alarm cables, the bay controller back plane cover must be temporarily removed. After cables installation is complete, reinstall the backplane cover.
Central office alarm cables route to the SSR bay using customer supplied alarm cables. The alarm cables connect to the SSR bay via a D-type, 15-pin connector. The DB-15 connector is located on the bay controller backplane at the bottom rear of the chassis (see Figure 4-5).
PROCEDURE: Use the following steps to connect the central office alarm to the SSR:
Step 1 Locate the CO alarm on the rear of the SSR chassis (see Figure 4-5).
Figure 4-5. CO Alarm Connection
Step 2 Attach the DB-15 central office alarm cable to the alarm out CO Alarm connector to the bay controller backplane (see Figure 4-5).
Step 3 In the event you need to isolate the customer alarm system from the SSR during service or repairs, bypass the alarm by inserting a switch between the alarm cable and the alarm system. Be sure to reset the switch to the ON position after completion of the service or repair.
For long cables, ensure that your alarm system is not impeded by cable resistance.
Configuring Central Office Alarm Cable Connections
The SSR has three sets of relays to generate central office alarms. When connected at the CO, the relays provide audible (bells, chimes, gongs) and visual (red, amber) indicators in the CO. Refer to Figure 4-6 for the pinout.
Figure 4-6. DB-15 Pinout
Normally CLOSED/OPEN refers to the un-energized relay position.
If no power is supplied to the bay controller:
- Critical_LED_Normally_Closed will be shorted to Critical_LED_Common pin.
- Critical_Alarm_Normally_Closed will be shorted to Critical_Alarm_Common_Pin.
- Under normal power and operating conditions: Critical_LED_Normally_Closed will be open to Critical_LED_Common pin.
- Critical_Alarm_Normally Closed will be open to Critical_Alarm_Common pin.
If an alarm condition occurs, the "Alarm Cutout" push button located on the BIP deactivates the Critical, Major, and Minor alarm (Klaxtron) relays while leaving the LED relays active. The LED relays will remain activated until the fault condition is cleared by software. All relay contacts are capable of maximum current rating of 2A at 30 Vdc, 0.5A at 115VAC.
Installing the Front EMI Covers
After installing and cabling modules, reinstall the front EMI cover.
Each SSR bay has two shelves numbered from 1 (top) and 2 (bottom). The EMI cover is a stand-alone unit and requires no hardware. The EMI cover attaches to the chassis frame with latch screws on the top and pull knobs on the bottom (see Figure 4-7).
PROCEDURE: Use the following procedure to reinstall the EMI shelf cover:
Step 1 Position the notches on the inside top of the EMI cover onto the two protruding screws on the chassis frame and slide the shelf cover down onto the screws (see Figure 4-7).
Step 2 Pivot the shelf cover towards the bottom of the shelf and snap it into place (see Figure 4-7).
Figure 4-7. Reinstalled Front EMI Cover
| |
|
|
Copyright © 2005
Avici Systems Inc.
Avici® and TSR®
is a registered trademark of Avici Systems Inc.
IPriori™, Composite Links™, SSR™, QSR, and NSR® are
trademarks of Avici Systems Inc.
Source
File Name: c4-instcbls.fm
HTML File Name: c4-instcbls.html
Last Updated: 04/04/05 at 16:10:28