|
|
The MGX 8240 shelf is a multi-slot chassis, supporting multiple CES modules and their associated Interface I/O assemblies. The shelf is designed as an integrated unit containing the following:
This section describes the types of physical interfaces supported by the
MGX 8240.
Table 2-1 lists the switch physical interfaces under different conditions.
| Physical Interface | Number of Ports Supported With | ||
|---|---|---|---|
| No Redundancy | 1 for 4 Redundancy Support | Each CES 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 |
OC3 ATM Trunk Ports | 15 (30 with APS) | 12 (24 with APS) | 1 (2 with APS) |
RS232 Serial Ports for CLI. | 16 | 16 | 1 |
10-BaseT Ethernet Ports for network management | 1+ 1 for backup | 1+1 for backup | 1 |
Channelized OC3 Access | 15 (30 with APS) | 12 (24 with APS) | 1 (2 with APS) |
Table 2-2 shows the dimensions of an unmounted MGX 8240 unit.
| Dimension | Value |
|---|---|
Depth |
18.5 in. 22.5 in. |
without cable management | |
with cable management | |
Width | 21.5 in. |
Height | 33.25 in.(19 RU) |
Weight |
|
empty | 100 lbs. |
fully loaded | 220 lbs. |
Shelf wattage (fully loaded) | 1500 Watts |
The shelf is designed to be center-mounted in a standard telecom 23 inch relay rack. Two CES shelves can be mounted in a standard 7-foot configuration.
The CES shelf has a 16-slot module cage. The CES modules are inserted from the front of the chassis and are secured in place using module insertion/extraction levers. The slots are numbered 1 through 16 (from left to right) on the bottom of the module cage.
Slot 1:
Slots 2 through 16:
The Mid-Plane design:
I/O Panels are installed in the rear of the chassis; three types of I/O modules exist:
1. The CES IOM I/O has two OC3 transceivers, three DS3 ports, and an RJ45 CRAFT port.
2. The IOO I/O has four OC3 transceivers (two for trunk; two for access) and an RJ45 craft port.
3. The Common Equipment I/O (not IMC) has:
The I/O modules are inserted and extracted using levers, and locked down with captive hardware. A blank I/O panel is supplied to cover slots that do not contain one of the above modules. (For pinouts, refer to the MGX 8240 Installation Guide.)
The MGX 8240 incorporates three fan tray assemblies. Each fan tray assembly:
Any eight of the nine fans are sufficient to cool a fully-loaded chassis. Each fan has a tachometer output. These nine outputs are bused to each of the 15 CES module slots.
During FDOS, the installer select at least one CES module to have the responsibility for monitoring and reporting fan status. All other CES modules have this feature disabled as the default.
Upon detection of any fan failure, the CES performs the following:
When a fan tray is removed, all three fans on the tray appear to fail. This condition generates fan failure alarms.
The shelf is equipped with a removable reusable air filter. Air intake is from the front and from the sides to maximize the intake air volume. Figure 2-3 represents the front and side air intakes.
On the chassis, faceplates are installed as follows:
The DC Input module provides the following features:
A cable management system is provided with the MGX 8240. It is removable for those customers who wish to use other commercially available systems.
The CES module has front panel LED indicators to display module alarm status (see Figure 2-4). All external connectivity to the CES module is through its midplane connector.
Multiple CES modules per chassis can be optionally installed to act as a backup for up to four other CES modules in the chassis. Each CES module has its own temperature sensor for detecting over-temperature conditions, and generates an individual over-temperature "major" alarm.
The LEDs indicate the following:
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 PSM1 cards in a switch—up to 15. The IMC has the following functions:
The MGX 8240 has 15 full-size slots and 2 half-size slots. An IMC fits into each of the two half-size slots. Each MGX 8240 uses two IMCs, one primary and one backup. Figure 2-6 shows the slot designation for the IMC.
The IMC I/O Panel has an RJ45 Connector for the Shelf Ethernet Interface, an RJ11 Connector for the Shelf RS232 serial interface, pin connectors for the 4 alarm relay contacts, and 2 BITS inputs
The "Redundant Switch Out" LED changes from yellow to green when the IMC becomes primary, and from green to yellow when the IMC becomes secondary.
The "RS232" connector is for factory use only. The "Reset" button, recessed behind the faceplate, does a hard reset of the card.
The front of the IMC card has five LEDs: READY, CRITICAL, MAJOR, MINOR, and PRIMARY STATUS. They indicate the following:
The Critical, Major, and Minor alarms reflect the status of all PSM1s in the chassis. The Ready and Primary Status relate only to the IMC itself.
The following alarms will be sent by the IMC card:
 |
Note If a primary card A fails and the backup B takes over, the backup B will become primary and will send the Backup Failure alarm, because its backup (previously primary A) has failed. This is a Major alarm. |
The CES I/O module provides external connectivity (physical termination) on behalf of a CES module. The CES I/O module normally connects to the CES module across the midplane in the same slot position. If a CES module fails, the I/O module can be switched (controlled by the backup CES module) to route its midplane connections to the backup CES module. The CES I/O module provides the following external connectors:
Release 1 chassis contain a common I/O module, which provides external connectors for all 15 CES modules in the chassis as follows:
The CES module with CES I/O module combined with the Common I/O module forms an independent logical CES module.
The Common I/O Module has been replaced in later releases by the IMC card.
Posted: Sun Sep 29 05:16:29 PDT 2002
All contents are Copyright © 1992--2002 Cisco Systems, Inc. All rights reserved.
Important Notices and Privacy Statement.