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CHAPTER 2
Description
Physical Description
The MGX 8240 shelf is a multi-slot chassis, supporting multiple PSM cards and their associated
interface I/O assemblies. The shelf is designed as an integrated unit containing the following:
• 16-slot card cage (15 slots usable for PSMs; 1 divided slot for IMC or common equipment card).
• Single 16-slot mid-plane.
• Three independent, hot-swappable fan trays (any two of which can adequately cool the fully loaded
chassis).
• Removable air filter.
• -48 V
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Chapter 2 Description Figure 2-1 MGX 8240 Front View Physical Interfaces & Specifications This section describes the types of physical interfaces supported by the MGX 8240. Table 2-1 lists the switch physical interfaces under different conditions. Table 2-1 Switch Physical Interfaces Supported Number of Ports Supported 1 for 4 Redundancy Physical Interface No Redundancy Support Each PSM Blade DS3 Access Port 45 36 3 DS1 ports under DS3 1,260 1,008 84 DS0 ports under DS3 30,240 24,192 2,016
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Chapter 2 Description Table 2-1 Switch Physical Interfaces Supported Number of Ports Supported 1 for 4 Redundancy Physical Interface No Redundancy Support Each PSM Blade RS232 Serial Ports for 16 16 1 CLI. 10/100BaseT Ethernet 1 Ports for network management Table 2-2 shows the dimensions of an unmounted MGX 8240 unit. Table 2-2 Unmounted MGX 8240 Dimensions Dimension Value Depth (without cable management) 18.5 in. Depth (withcable management) 22.5 in. Width (without mounting brackets) 21.25
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Chapter 2 Description Figure 2-2 MGX 8240 Physical Dimensions The shelf is designed to be center-mounted in a standard telecom 23-inch relay rack. Two chassis can be mounted in a standard 7-foot configuration. There should be at least 5” betweenthe two chassis. Module Cage and Slot Designation The MGX 8240 shelf has a 16-slot card cage. There are 15 full-size slots and 2 half-size slots. The two half-sized slots are for IMCs. An MGX 8240 with IMC redundancy uses two IMCs, one primary and on
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Chapter 2 Description Figure 2-3 Slot Designation (Front View) The PSM slots are numbered 1 through 16 (from left to right) on the bottom of the card cage. Slot 1: • Reserved for common equipment purposes (the IMC card). • Divided into two slots (A and B) for the IMC card. These slots are wired in parallel. • Provides: – Ethernet connectivity for remaining 15 slots. – BITS A and B connections for the user. – Alarm relay connections for the user. Slots 2 through 16: • Are identical with resp
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Chapter 2 Description Fan Trays The MGX 8240 incorporates three fan trays. Each fan tray: • Is a self-contained card installed from the front of the shelf. • Contains three fans. • Is hot-swappable for ease of servicing. • Has a bi-colored LED to show Ready (green) and Fault (red). Any two of the three fan trays are sufficient to cool a fully-loaded chassis. Each fan has a tachometer output. These nine outputs are bused to each of the 15 PSM card slots. During configuration, the installer s
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Chapter 2 Description Figure 2-4 Air Flow Power Module The DC input module provides the following features: • Integral On/Off Switch with Circuit Breaker. • EMI Filtering. • Terminal Block for A and B Power, A and B Power RTN, and a single Chassis and Logic Ground Terminal. Cable Management System A cable management system is provided with the MGX 8240. It is removable for those customers who wish to use other commercially available systems. Cisco MGX 8240 Hardware User’s Guide Release 3.0,
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Chapter 2 Description PSM Module and Faceplates On the chassis, faceplates on each PSM card provide EMI protection and visual indicators as to the card’s status. The PSM faceplate has LED indicators to display alarm status (see Figure 2-5). Unused slots have blank faceplates. All external connectivity to the PSM module is through its midplane connector. Each PSM module has its own temperature sensor for detecting over-temperature conditions, and generates an individual over-temperature majo
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Chapter 2 Description Figure 2-5 PSM Modules (Front View) LED Indications The LEDs indicate the following : • Critical—On a Critical Event, this LED goes from green to red. • Major—On a Major Event, this LED goes from green to red. • Minor—On a Minor Event, this LED goes from green to yellow. • Ready—When the Boot-up Process has successfully completed, this LED goes from red to green. Cisco MGX 8240 Hardware User’s Guide Release 3.0, Part Number 78-10728-01, July 2000 2-9
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Chapter 2 Description • Redundant Switch Over—applies only to Primary PSM modules. It indicates that the Backup PSM has switched out this primary. To indicate that the module is switched out, this LED goes from green to yellow. • The RS232/RJ11 connector is for Factory Use only. The PSM I/O Modules are shown in Figure 2-6. Figure 2-6 PSM I/O Module Cisco MGX 8240 Hardware User’s Guide 2-10 Release 3.0, Part Number 78-10728-01, July 2000
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Chapter 2 Description The PSM I/O module provides external connectivity (physical termination) on behalf of a PSM module. The PSM I/O module normally connects to the PSM module across the midplane in the same slot position. If a PSM module fails, the I/O module can be switched (controlled by the backup PSM module) to route its midplane connections to the backup PSM module. The PSM I/O module provides the following external connectors: Cisco MGX 8240 Hardware User’s Guide Release 3.0, Part N
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Chapter 2 Description • Three DS3 (BNC) connectors for channelized DS3 service interfaces. • Two OC3 connectors (second connector used for SONET 1+1 APS) for ATM trunk. • RS232/RJ45 Console port for CMDR. IMC Card The Integrated Management Controller (IMC) provides centralized out-of-band management connectivity to the MGX 8240 switch. The IMC can manage (detect and reset) all PSM cards in a switch—up to 15. The IMC has the following functions: • Allows the MGX 8240 to be seen and accessed
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Chapter 2 Description Figure 2-7 IMC Module (Faceplate and I/O) The IMC I/O card has an RJ45 Connector for the Shelf Ethernet Interface, an RJ45 Connector for the Shelf RS232 console interface, a 15-pin connector for the 4 alarm relay contacts, and 2 BITS inputs. The Ready LED changes from yellow to green when the IMC becomes primary, and from green to yellow when the IMC becomes secondary. The RJ11/RS232 connector on the IMC front card is for factory use only. Cisco MGX 8240 Hardware User’
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Chapter 2 Description Cisco MGX 8240 Hardware User’s Guide 2-14 Release 3.0, Part Number 78-10728-01, July 2000
