Compaq Switch Memory Channel Hub User Manual

DIGITAL 2T-CCMHA-CB Central Office  
Memory Channel Hub  
Installation/Service Guide  
Part Number: EK-MCHCO-IN. A01  
December 1998  
Compaq Computer Corporation  
Houston, Texas  
 
Table of Contents  
1 Introduction  
1.1 Overview .......................................................................................................... 1–1  
1.2 Components and Controls ................................................................................. 1–1  
1.2.1 Front Components................................................................................... 1–1  
1.2.2 Operator Control Panel............................................................................ 1–3  
1.2.3 Internal Components ............................................................................... 1–4  
1.2.4 Rear Components.................................................................................... 1–4  
1.3 Specifications.................................................................................................... 1–5  
2 Installation  
2.1 General ............................................................................................................. 2–1  
2.2 Site Preparation................................................................................................. 2–1  
2.3 Unpacking the Shipment................................................................................... 2–2  
2.4 Installing the 2T-CCMHA-CB Central Office Memory Channel Hub................ 2–4  
2.4.1 Determining the Installation Area............................................................ 2–4  
2.4.2 Attaching the Slide Assemblies to the Cabinet Rails................................ 2–6  
2.4.2.1 Attaching the Right Slide Assembly to the Cabinet Rails............... 2–6  
2.4.2.2 Attaching the Left Slide Assembly to the Cabinet Rails................. 2–7  
2.4.3 Attaching the Inner Races to the Tray ..................................................... 2–9  
2.4.4 Mounting the Memory Channel Hub, Front Bezel, and Interlock Actuator  
Bracket on the Tray ..................................................................................... 2–10  
2.4.5 Mounting the Chassis and Tray Assembly on the Slides ........................ 2–12  
2.5 Installing the Interlock System....................................................................... 2–14  
iii  
 
3 Removal and Replacement  
3.1 Introduction ...................................................................................................... 3–1  
3.2 Top Cover......................................................................................................... 3–3  
3.3 Power Supply.................................................................................................... 3–4  
Figures  
Figure 1-1 Front Components ................................................................................. 1–2  
Figure 1-2 Operator Control Panel.......................................................................... 1–3  
Figure 1-3 Rear Components .................................................................................. 1–4  
Figure 2-1 Installation Area and Rail-Hole Pattern (EIA Rail-Hole Pattern) ........... 2–5  
Figure 2-2 Attaching the Slide Assemblies to the Cabinet Rails.............................. 2–7  
Figure 2-3 Attaching the Inner Slide Races............................................................. 2–9  
Figure 2-4 Mounting the Memory Channel Hub, Front Bezel, and Interlock Actuator  
Bracket on the Tray.............................................................................................2–11  
Figure 2-5 Mounting the Chassis and Tray Assembly on the Slides .......................2–13  
Figure 2-6 The Interlock System............................................................................2–16  
Figure 3-1 Removing and Replacing the Top Cover ............................................... 3–3  
Figure 3-2 Removing the Power Supply.................................................................. 3–4  
Figure 3-3 Disconnecting the Power Cable Connector and Removing the Power  
Supply.................................................................................................................. 3–5  
Tables  
Table 1-1 2T-CCMHA-CB Central Office Memory Channel Hub Specifications... 1–5  
Table 2-1 Mounting Hardware and Component List ............................................... 2–3  
iv  
 
Preface  
Overview  
This guide provides the information necessary to install the 2T-CCMHA-CB central office  
Memory Channel hub in a 48.26-cm (19-in.) NEBS 2000/ETSI-compliant cabinet with an  
EIA rail-hole pattern. It also provides information on removing and replacing the top cover  
and the power supply.  
Intended Audience  
This guide is intended for Compaq service personnel or qualified Self-maintenance  
customers who are familiar with installing computer systems, and for system managers and  
others who perform system management tasks.  
How to Use This Guide  
Read this guide before installing the 2T-CCMHA-CB central office Memory Channel hub.  
Before installation review the warranty. The terms of the warranty agreement with  
Compaq may require that a qualified Compaq Customer Services representative install the  
system. Contact your local Compaq representative if you have any questions.  
Organization  
This guide is organized as follows:  
Chapter 1, Introduction – Provides an overview of the 2T-CCMHA-CB central office  
Memory Channel hub and a description of the basic components and controls.  
Chapter 2, Installation – Provides site preparation, unpacking, and system installation  
information.  
v
 
Chapter 3,.Removal and Replacement – Provides the removal and replacement  
procedures for the top cover and power supply.  
Related Documents  
Other documents related to the 2T-CCMHA-CB central office Memory Channel hub  
include the following:  
Memory Channel User’s Guide (EK-PCIRM-UG)  
Memory Channel Service Information (EK-PCIRM-SV)  
Conventions  
This guide uses the following conventions:  
Convention  
Meaning  
Note  
A note calls the reader’s attention to any item of information that may be of  
special importance.  
Caution  
A caution contains information essential to avoid damage to the equipment.  
A warning contains information essential to the safety of personnel.  
Circled numbers provide a link between figures or examples and text.  
Warning  
Italic type  
Italic type emphasizes important information, indicates variables, and  
indicates complete titles of manuals.  
Reader’s Comments  
Compaq welcomes your comments on this or any other manual. You can send your  
comments to Compaq in the following ways:  
Internet electronic mail: [email protected]  
Mail:  
Compaq Computer Corporation  
Information Design  
PKO3-2/21J  
129 Parker Street  
Maynard, MA 01754-2199  
For additional information call 1-800-344-4825.  
vi  
 
1
Introduction  
1.1 Overview  
The 2T-CCMHA-CB central office Memory Channel hub is used to share and route data  
between two AlphaServer 4100 central office systems.  
1.2 Components and Controls  
System components and controls are located at the front, internally, and at the rear of the  
Memory Channel hub chassis.  
1.2.1 Front Components  
Figure 1-1 shows the components located on the front of the Memory Channel hub chassis.  
DIGITAL 2T-CCMHA-CB Central Office Memory Channel Hub Installation/Service Guide 1–1  
 
Introduction  
Figure 1-1 Front Components  
DIGIT  
AL  
Memor  
Central Office  
y
Channel Hub 100/8  
1
LJ-06497.AI7  
Operator control panel  
1–2 DIGITAL 2T-CCMHA-CB Central Office Memory Channel Hub Installation/Service Guide  
 
Introduction  
1.2.2 Operator Control Panel  
The operator control panel (OCP), shown in Figure 1-2, is located on the front of the  
Memory Channel hub chassis and consists of an On/Off switch, a Reset button, and three  
LEDs.  
Figure 1-2 Operator Control Panel  
3
4
5
DIGITAL Memory Channel Hub 100/8  
Central Office  
2
1
LJ-06498.AI7  
On/Off switch — Powers the system secondary dc power on or off.  
Reset button — Initializes the system.  
Turbo LED — Lit when computer runs at rated microprocessor speed. Not lit when in  
non-turbo mode.  
Disk LED — Indicates disk drive activity.  
Power LED — Lit when power switch is On.  
DIGITAL 2T-CCMHA-CB Central Office Memory Channel Hub Installation/Service Guide 1–3  
 
Introduction  
1.2.3 Internal Components  
The internal components of the Memory Channel hub chassis consist of the following:  
One motherboard  
Four to eight CCMLA hub linecards  
Cooling fan  
1.2.4 Rear Components  
Figure 1-3 shows the components located on the rear of the Memory Channel hub chassis.  
Figure 1-3 Rear Components  
3
1
2
7
6
5
4
3
2
1
0
LJ-06499.AI7  
Power supply  
-48 Vdc power receptacle  
CCMLA linecard slots  
1–4 DIGITAL 2T-CCMHA-CB Central Office Memory Channel Hub Installation/Service Guide  
 
Introduction  
1.3 Specifications  
Table 1-1 contains the physical, environmental, and electrical specifications for the 2T-  
CCMHA-CB central office Memory Channel hub.  
Table 1-1 2T-CCMHA-CB Central Office Memory Channel Hub Specifications  
Physical Characteristics  
Chassis  
Weight  
13.6 kg (30 lb.)  
Length  
40.64 cm (16 in.)  
48.26 cm (19.0 in.)  
17.78 cm (7.00 in.)  
Width  
Height  
Environmental Requirements  
Temperature range  
Operating  
0°C to 40°C (32°F to 104°F)  
-20°C to 95°C (-4°F to 203°F)  
11°C/hr (20°F/hr) maximum  
28°C (82°F)  
Non-Operating  
Temperature change rate  
Wet bulb temperature  
(maximum)  
Dew point temperature  
(minimum)  
2°C (36°F)  
Relative humidity  
Altitude  
10% to 95% (noncondensing)  
60 m to 3050 m (-200 ft to 10,000 ft)  
Electrical Requirements  
Nominal voltage  
-48 Vdc  
Operational voltage range  
Input current (maximum)  
Input power  
-36 to -72 Vdc  
1.25 A at -48 Vdc  
60 W  
DIGITAL 2T-CCMHA-CB Central Office Memory Channel Hub Installation/Service Guide 1–5  
 
SES Template Word 7 Blank Page Fix by Peter LaQuerre  
 
2
Installation  
2.1 General  
This chapter covers the installation of the 2T-CCMHA-CB central office Memory Channel  
hub in a 48.26-cm (19-in.) NEBS 2000/ETSI-compliant cabinet with an EIA rail-hole  
pattern. The major topics covered in this chapter include:  
Site Preparation  
Unpacking the Shipment  
Installing the 2T-CCMHA-CB central office Memory Channel Hub  
– Determining the Installation Area  
– Attaching the Slide Assemblies to the Cabinet Rails  
– Attaching the Inner Races to the Tray  
– Mounting the Chassis and Front Bezel to the Tray  
Installing the Interlock System  
For information on configuration and verification, refer to the Memory Channel User’s  
Guide.  
2.2 Site Preparation  
The installation instructions that follow assume that:  
All cables that you plan to connect to the 2T-CCMHA-CB central office Memory  
Channel hub are in place and clearly labeled. These cables are the BC12N cables from  
the CCMAA adapters installed in the AlphaServer systems.  
The specifications and conditions listed in Section 1.3 have been met.  
DIGITAL 2T-CCMHA-CB Central Office Memory Channel Hub Installation/Service Guide 2–1  
 
Installation  
The system is located in an area that provides sufficient clearance for ventilation and  
servicing. A clearance of 61 cm (24 in.) at the rear and 129.6 cm (51 in.) at the front  
of the cabinet is required for service.  
________________________ Caution___________________________  
Do not impede airflow by obstructing the front and rear of the cabinet.  
Exceeding internal thermal limits can affect system reliability.  
___________________________________________________________  
_______________________ WARNING__________________________  
The 2T-CCMHA-CB central office Memory Channel hub can weigh up to  
13.6 kg (30 lb.). To prevent personal injury and equipment damage, ensure  
that the system is contained in an enclosure that can be stabilized when the  
system is pulled out on its slides.  
___________________________________________________________  
_______________________ ACHTUNG__________________________  
Der 2T-CCMHA-CB Central Office Memory Channel Hub kann bis zu 13,6  
kg (30 lb) wiegen. Um Personen- und Geräteschaden zu vermeiden, sollten  
Sie deshalb sicherstellen, daß sich das System in einem Gehäuse befindet,  
das stabilisiert werden kann, wenn das System an den Schienen  
herausgezogen wird.  
___________________________________________________________  
2.3 Unpacking the Shipment  
The 2T-CCMHA-CB central office Memory Channel hub shipment may include several  
cartons. Check the packing list to ensure that all items listed have been received.  
If the equipment is damaged or if any items are missing, notify the delivery agent and  
contact the Compaq sales representative.  
Save all shipping cartons in case the equipment needs to be moved to a new location, or  
needs to be returned for repair.  
2–2 DIGITAL 2T-CCMHA-CB Central Office Memory Channel Hub Installation/Service Guide  
 
Installation  
________________________WARNING __________________________  
The 2T-CCMHA-CB central office Memory Channel hub can weigh up to  
13.6 kg (30 lb.). Use sufficient personnel or the proper lifting equipment  
when lifting or moving the system.  
____________________________________________________________  
________________________ACHTUNG __________________________  
Der 2T-CCMHA-CB Central Office Memory Channel Hub kann bis zu 13,6  
kg (30 lb) wiegen. Beim Hochheben oder Transport des Systems sollten  
deshalb genügend Hilfskräfte vorhanden sein oder die richtigen  
Hebewerkzeuge benutzt werden.  
____________________________________________________________  
Table 2-1 lists the mounting hardware and components included with the 2T-CCMHA-CB  
central office Memory Channel hub shipment for installation in a 48.26-cm (19-in.) NEBS  
2000/ETSI-compliant cabinet with an EIA rail-hole pattern.  
Table 2-1 Mounting Hardware and Component List  
Description  
Part Number  
12-46387-01  
74- 53806-01  
74-53812-02  
74-53812-01  
74-53819-01  
74-53822-02  
74-48997-03  
90-00063-37  
90-06291-10  
90-09545-00  
90-00063-39  
90-11510-01  
90-06563-00  
90-06661-00  
90-07031-01  
EK-MCHCO-IN  
Quantity  
Chassis slide assembly  
Tray  
1 pair  
1
1
Front bezel (gray) or  
Front bezel (blue)  
Interlock actuator bracket  
Stabilizer bracket  
Actuator latch  
1
1
1
1
Screw, 10-32 truss-head  
Set screw, 6-32  
2
2
Screw, 8-32 pan-head  
Screw, 10-32 truss-head  
Standoff, 10-32  
6
23  
4
Kepnut, 8-32  
6
Flat washer, 8-32  
Tie-wraps  
5
10  
1
DIGITAL 2T-CCMHA-CB Central Office Memory Channel Hub  
Installation/Service Guide  
DIGITAL 2T-CCMHA-CB Central Office Memory Channel Hub Installation/Service Guide 2–3  
 
Installation  
2.4 Installing the 2T-CCMHA-CB Central Office Memory  
Channel Hub  
The following sections contain the procedure for installing the 2T-CCMHA-CB central  
office Memory Channel hub in a 48.26-cm (19-in.) NEBS 2000/ETSI-compliant cabinet  
with an EIA rail-hole pattern.  
Tools Required  
Phillips-head screwdriver  
Flat-blade screwdriver  
Adjustable wrench  
2.4.1 Determining the Installation Area  
The 2T-CCMHA-CB central office Memory Channel hub requires 22.23 cm (8.75 in.) of  
vertical space or 15 contiguous holes in a 48.26-cm (19-in.) NEBS 2000/ETSI-compliant  
cabinet with an EIA rail-hole pattern.  
The holes in the EIA rail-hole pattern cabinet rails follow a pattern of 1.27 cm (0.50 in.),  
1.59 cm (0.625 in.), and 1.59 cm (0.625 in.). This pattern is called a set and is repeated for  
the length of the cabinet rails.  
To determine the installation area, perform the following steps at the front and the rear  
cabinet rails (refer to Figure 2-1).  
1. Select a section of the cabinet rail where there is a 1.27 cm (0.05 in.) space between  
two holes and make a mark between these two holes. This is the starting point of the  
installation area.  
2. Count up or down 15 holes from the starting point and make a mark above or below  
the 15th hole. The area between these two marks is the installation area. The bottom  
hole of the installation area is identified as hole 1 of the installation area.  
3. Repeat steps 1 and 2 for the same holes on the front of both front rails and the rear of  
both rear rails.  
The total installation area for the 2T-CCMHA-CB central office Memory Channel hub is  
or 22.23 cm (8.75 in.) of vertical space.  
2–4 DIGITAL 2T-CCMHA-CB Central Office Memory Channel Hub Installation/Service Guide  
 
Installation  
Figure 2-1 Installation Area and Rail-Hole Pattern (EIA Rail-Hole Pattern)  
4
4
8 3/4"  
7"  
"Installation Area"  
5 1/4"  
3 1/2"  
1 3/4"  
0.625 inch  
0.625 inch  
0.500 inch  
0.625 inch  
3
2
1
3
2
1
0.625 inch  
0.500 inch  
0.625 inch  
"1.75 Rule"  
0.625 inch  
0.500 inch  
0.625 inch  
LJ-06500.AI4  
Hole 1 for attaching left and right slide  
brackets.  
Hole 3 for attaching left and right slide  
brackets.  
Hole 2 for installing standoffs on left  
and right front rails.  
Hole 14 for installing standoffs and nuts on  
left and right front rails.  
DIGITAL 2T-CCMHA-CB Central Office Memory Channel Hub Installation/Service Guide 2–5  
 
Installation  
2.4.2 Attaching the Slide Assemblies to the Cabinet Rails  
The following sections contain the procedures for attaching the right and left slide  
assembles to the cabinet rails.  
2.4.2.1 Attaching the Right Slide Assembly to the Cabinet Rails  
To attach the right slide assembly to the cabinet rails, refer to Figure 2-2 and proceed as  
follows:  
1. Determine the proper mounting holes for the right slide brackets. The proper mounting  
holes are the 1st, 2nd, and 3rd holes of the installation area (see Figure 2-1).  
2. Locate the right slide assembly.  
3. Place the right front slide bracket on the inside of the right front rail and align the  
three slide bracket holes and with the 1st, 2nd, and 3rd holes of the installation area on  
the right front rail.  
4. Install two 10-32 truss-head screws in the 1st and 3rd holes of the installation area  
to secure the right front slide bracket to the right front rail, but do not tighten.  
5. Install a 10-32 standoff in the 2nd hole of the installation area on the right front rail.  
Tighten this standoff.  
6. Place the right rear slide bracket on the inside of the right rear rail and align the three  
slide bracket holes and with the 1st, 2nd, and 3rd holes of the installation area on the  
right rear rail.  
7. Install three 10-32 truss-head screws in the 1st, 2nd, and 3rd, holes of the  
installation area to secure the right rear slide bracket to the right rear rail, but do not  
tighten.  
8. Tighten the two 8-32 screws and nuts that secure the right rear slide bracket to the  
right slide assembly.  
9. Securely tighten all five 10-32 truss-head screws that secure the right slide assembly  
to the right front and rear cabinet rails.  
10. Install a 10-32 standoff in 14th hole of the installation area on the right front rail  
and secure it in place with a 10-32 nut.  
2–6 DIGITAL 2T-CCMHA-CB Central Office Memory Channel Hub Installation/Service Guide  
 
Installation  
Figure 2-2 Attaching the Slide Assemblies to the Cabinet Rails  
3
4
3
4
1
1
2
2
LJ-06501.AI7  
2.4.2.2 Attaching the Left Slide Assembly to the Cabinet Rails  
To attach the left slide assembly to the cabinet rails, refer to Figure 2-2 and proceed as  
follows:  
1. Determine the proper mounting holes for the left slide brackets. The proper mounting  
holes are the 1st, 2nd, and 3rd holes of the installation area (see Figure 2-1).  
2. Locate the left slide assembly.  
3. Place the left front slide bracket on the inside of the left front rail and align the three  
slide bracket holes and with the 1st, 2nd, and 3rd holes of the installation area on the  
left front rail.  
4. Install two 10-32 truss-head screws in the 1st and 3rd holes of the installation area  
to secure the left front slide bracket to the left front rail, but do not tighten.  
DIGITAL 2T-CCMHA-CB Central Office Memory Channel Hub Installation/Service Guide 2–7  
 
Installation  
5. Install a 10-32 standoff in the 2nd hole of the installation area on the left front rail.  
Tighten this standoff.  
6. Place the left rear slide bracket on the inside of the left rear rail and align the three  
slide bracket holes and with the 1st, 2nd, and 3rd holes of the installation area on the  
left rear rail.  
7. Install three 10-32 truss-head screws in the 1st, 2nd, and 3rd, holes of the  
installation area to secure the left rear slide bracket to the left rear rail, but do not  
tighten.  
8. Tighten the two 8-32 screws and nuts that secure the left rear slide bracket to the left  
slide assembly.  
9. Securely tighten all five 10-32 truss-head screws that secure the left slide assembly to  
the left front and rear cabinet rails.  
10. Install a 10-32 standoff in 14th hole of the installation area on the left front rail and  
secure it in place with a 10-32 nut.  
2–8 DIGITAL 2T-CCMHA-CB Central Office Memory Channel Hub Installation/Service Guide  
 
Installation  
2.4.3 Attaching the Inner Races to the Tray  
To attach the inner slide races to the tray, refer to Figure 2-3 and proceed as follows:  
_________________________Caution ___________________________  
When performing this procedure, ensure that the locking lever is on the outside  
of the inner slide race. Otherwise, the slide will be damaged when the system is  
installed on the slide assemblies.  
____________________________________________________________  
Remove the inner slide race from the right slide assembly and attach the right inner slide  
race to the right side of the tray (as viewed from the front) using three 8-32 pan-head  
screws  
.
Remove the inner slide race from the left slide assembly and attach the left inner slide race  
to the left side of the tray (as viewed from the front) using three 8-32 pan-head screws  
.
Figure 2-3 Attaching the Inner Slide Races  
3
1
2
2
LJ-06503.AI7  
DIGITAL 2T-CCMHA-CB Central Office Memory Channel Hub Installation/Service Guide 2–9  
 
Installation  
2.4.4 Mounting the Memory Channel Hub, Front Bezel, and Interlock  
Actuator Bracket on the Tray  
To mount the 2T-CCMHA-CB central office Memory Channel hub, front bezel, and  
interlock actuator bracket on the tray, refer to Figure 2-4 and proceed as follows:  
_______________________ WARNING__________________________  
The 2T-CCMHA-CB central office Memory Channel hub can weigh up to  
13.6 kg (30 lb.). Use sufficient personnel or the proper lifting equipment  
when lifting or moving the system.  
___________________________________________________________  
_______________________ ACHTUNG__________________________  
Der 2T-CCMHA-CB Central Office Memory Channel Hub kann bis zu 13,6  
kg (30 lb) wiegen. Beim Hochheben oder Transport des Systems sollten  
deshalb genügend Hilfskräfte vorhanden sein oder die richtigen  
Hebewerkzeuge benutzt werden.  
___________________________________________________________  
1. Turn the 2T-CCMHA-CB central office Memory Channel hub upside down on a  
proper work surface.  
2. Turn the tray (with inner races attached) upside down and place it on bottom cover  
of the 2T-CCMHA-CB central office Memory Channel hub  
.
3. Align the nine holes in the bottom cover of the 2T-CCMHA-CB central office  
Memory Channel hub with the nine holes in the tray.  
4. Install nine 10-32 truss-head screws through the bottom of the tray into the hub  
chassis to secure the 2T-CCMHA-CB central office Memory Channel hub to the tray.  
5. Turn the front bezel upside down and place flat washers on the five left most studs  
on the inside of the bezel. A flat washer is not required on the stud behind the  
indented label area.  
6. Align the six studs on the inside of the bezel with the six holes in the front of the tray  
and push the bezel onto the tray.  
7. Secure the front bezel to the tray with six 8-32 kepnuts  
.
8. Use two 8-32 screws to secure the interlock actuator bracket to the rear of the  
tray.  
2–10 DIGITAL 2T-CCMHA-CB Central Office Memory Channel Hub Installation/Service Guide  
 
Installation  
Figure 2-4 Mounting the Memory Channel Hub, Front Bezel, and Interlock  
Actuator Bracket on the Tray  
3
5
3
3
4
5
1
2
6
LJ-06502A.AI7  
7
DIGITAL 2T-CCMHA-CB Central Office Memory Channel Hub Installation/Service Guide 2–11  
 
Installation  
2.4.5 Mounting the Chassis and Tray Assembly on the Slides  
To mount the chassis and tray assembly on the slides, refer to Figure 2-5 and proceed as  
follows:  
_______________________ WARNING__________________________  
The 2T-CCMHA-CB central office Memory Channel hub can weigh up to  
13.6 kg (30 lb.). Use sufficient personnel or the proper lifting equipment  
when lifting or moving the system.  
___________________________________________________________  
_______________________ ACHTUNG__________________________  
Der 2T-CCMHA-CB Central Office Memory Channel Hub kann bis zu 13,6  
kg (30 lb) wiegen. Beim Hochheben oder Transport des Systems sollten  
deshalb genügend Hilfskräfte vorhanden sein oder die richtigen  
Hebewerkzeuge benutzt werden.  
___________________________________________________________  
Stabilize the cabinet before installing the chassis and tray assembly into the cabinet.  
1. Pull both slide assemblies out fully to their locked positions.  
2. Lift the chassis and tray assembly and position it so that the inner slide races fit into  
the front end of the slides.  
3. Push the chassis and tray assembly into the slides until it stops. Push in on the two  
locking levers and then push the system into the cabinet.  
4. Secure the chassis to the front cabinet rails using four 10-32 truss-head screws . The  
screws go through the front bezel and into the four standoffs previously installed in the  
2nd and 14th holes of the left and right front cabinet rails.  
2–12 DIGITAL 2T-CCMHA-CB Central Office Memory Channel Hub Installation/Service Guide  
 
Installation  
Figure 2-5 Mounting the Chassis and Tray Assembly on the Slides  
1
3
1
3
DIGIT  
AL  
Memor  
Central Office  
y
Channel Hub 100/8  
2
4
LJ-06504.AI7  
DIGITAL 2T-CCMHA-CB Central Office Memory Channel Hub Installation/Service Guide 2–13  
 
Installation  
2.5 Installing the Interlock System  
The interlock system helps prevent cabinet instability by allowing only one system at a  
time to be pulled out of the cabinet.  
The interlock system consists of a vertical rod on which are mounted actuator latches for  
each product installed in the cabinet. These actuator latches engage the interlock actuator  
bracket on the rear of rackmount systems. When a rackmount system is pulled out of the  
cabinet, the actuator latches rotate to prevent any other rackmount system that has an  
interlock actuator bracket from being pulled out of the cabinet.  
If additional products are installed into the cabinet, actuator latches for those products  
should be installed. To install actuator latches, refer to Figure 2-6 and proceed as follows:  
1. Remove the screws securing the bottom mounting bracket to the cabinet.  
2. Slide the mounting bracket off the bottom of the vertical rod  
.
3. Slide the actuator latch for the new product onto the bottom of the vertical rod.  
4. Slide the stabilizer bracket for the new product onto the bottom of the vertical rod.  
5. Replace the bottom mounting bracket and install the screws removed in step 1 but  
do not tighten them.  
6. Position the stabilizer bracket so that the top surface of the stabilizer bracket is  
aligned just below the interlock actuator bracket on the installed system (see bottom  
expanded view). This may require the loosening and sliding of other latches and  
stabilizer brackets to accommodate the new configuration.  
7. Install and tighten the two 10-32 truss-head screws provided to secure the stabilizer  
bracket to the rear rail (see bottom expanded view).  
8. Position the new actuator latch to properly engage the interlock actuator bracket,  
and tighten the two 6-32 set screws to secure the latch (see bottom expanded view).  
9. Now tighten the screws to secure the bottom mounting bracket  
.
The expanded view (A) shows the position of the actuator latches when all systems are  
pushed into the cabinet. The expanded view (B) shows the position of all actuator latches  
after one system has been pulled out.  
2–14 DIGITAL 2T-CCMHA-CB Central Office Memory Channel Hub Installation/Service Guide  
 
Installation  
__________________________ Note _____________________________  
The interlock system is compatible with the 2T-CCMHA-CB central office  
Memory Channel hub. Other systems may not be compatible because the  
interlock actuator bracket may not engage properly. In these cases, do not install  
the interlock actuator bracket on those systems.  
____________________________________________________________  
________________________WARNING __________________________  
If a system is installed without an interlock actuator bracket or the vertical  
rod in the cabinet does not engage properly with the system interlock  
actuator bracket, it is the customer's responsibility to provide a stable  
cabinet.  
____________________________________________________________  
________________________ACHTUNG __________________________  
Falls ein System ohne Verriegelungsklammer installiert wird oder die  
vertikale Stange im Gehäuse nicht richtig in der Verriegelungsklammer des  
Systems einrastet, dann ist der Kunde selbst für die Bereitstellung eines  
stabilen Gehäuses verantwortlich.  
____________________________________________________________  
DIGITAL 2T-CCMHA-CB Central Office Memory Channel Hub Installation/Service Guide 2–15  
 
Installation  
Figure 2-6 The Interlock System  
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LJ-06471.AI7  
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2–16 DIGITAL 2T-CCMHA-CB Central Office Memory Channel Hub Installation/Service Guide  
 
3
Removal and Replacement  
3.1 Introduction  
This chapter contains the procedures for removing and replacing the top cover and power  
supply of the 2T-CCMHA-CB central office Memory Channel hub:  
For troubleshooting information and the procedure for removing the CCMLA linecards,  
motherboard, hub fan assembly, and hub control panel, refer to the Memory Channel  
Service Information manual.  
________________________WARNING __________________________  
Before servicing the 2T-CCMHA-CB central office Memory Channel hub  
chassis or performing any of the following removal and replacement  
procedures, ensure that the DC On/Off button on the OCP is in the OFF  
position and disconnect the power cable from the power supply dc input  
receptacle on the rear of the chassis.  
____________________________________________________________  
________________________ACHTUNG __________________________  
Vor der Wartung des Gehäuses des 2T-CCMHA-CB Central Office  
Memory Channel Hub bzw. vor der Durchführung der folgenden Verfahren  
zum Entfernen oder Auswechseln von Komponenten müssen der On/Off-  
Netzstromschalter auf dem OCP auf OFF eingestellt und das Netzkabel aus  
der Netzsteckereingangsbuchse an der Rückseite des Gehäuses gezogen  
werden.  
____________________________________________________________  
DIGITAL 2T-CCMHA-CB Central Office Memory Channel Hub Installation/Service Guide 3–1  
 
Removal and Replacement  
_______________________ WARNING__________________________  
Only a qualified service person should remove and replace components in  
the 2T-CCMHA-CB central office Memory Channel hub. A qualified  
service person should have the technical training and experience necessary  
to be aware of the hazards to which they are exposed in performing a task  
and the measures that should be taken to minimize the danger to themselves  
or other persons.  
___________________________________________________________  
_______________________ ACHTUNG__________________________  
Die Komponenten im 2T-CCMHA-CB Central Office Memory Channel  
Hub dürfen nur von qualifiziertem Wartungspersonal entfernt bzw.  
ausgewechselt werden. Qualifiziertes Personal sollte entsprechend technisch  
geschult sein und über die nötige Erfahrung verfügen, um die möglichen  
Gefahren zu kennen, denen sie bei der Ausführung der notwendigen  
Wartungsarbeiten ausgesetzt sein könnten, und um die entsprechenden  
Schritte zur Minimierung dieser Gefahren für das Wartungspersonal und  
für andere Personen unternehmen zu können.  
___________________________________________________________  
Tools Required  
The following tools are required for servicing the 2T-CCMHA-CB central office Memory  
Channel hub chassis:  
Phillips-head screwdriver  
Flat-blade screwdriver  
Adjustable wrench  
3–2 DIGITAL 2T-CCMHA-CB Central Office Memory Channel Hub Installation/Service Guide  
 
Removal and Replacement  
3.2 Top Cover  
_________________________Caution ___________________________  
Use care when removing and replacing the cover to prevent damage to the RFI  
gaskets that are located around the cover and opening.  
____________________________________________________________  
Perform the following procedure to remove the top cover:  
1. Unlock the top cover by turning the key, located on the rear of the chassis, clockwise  
to the unlock position (see Figure 3-1). The lock is unlocked when the key is in the  
vertical position.  
2. Insert two fingers into the finger grip on the rear edge of the top cover.  
3. Slide the top cover toward the rear of the chassis and remove (see Figure 3-1).  
To replace the top cover, refer to Figure 3-1and reverse steps 1 through 3 of the removal  
procedure.  
Figure 3-1 Removing and Replacing the Top Cover  
DIGIT  
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Memor  
Centra  
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LJ-06508.AI7  
DIGITAL 2T-CCMHA-CB Central Office Memory Channel Hub Installation/Service Guide 3–3  
 
Removal and Replacement  
3.3 Power Supply  
Perform the following procedure to remove the power supply:  
1. Remove the top cover (see Section 3.2).  
2. Remove the four screws on the rear of the chassis that secure the power supply (see  
Figure 3-2).  
3. Loosen the two screws and disconnect the power cable connector from the power  
supply (see Figure 3-3).  
4. Slide the power supply toward the front of the chassis until it is free and then lift the  
power supply out of the chassis.  
To replace the power supply, refer to Figure 3-2 and Figure 3-3 and reverse steps 1  
through 4 of the removal procedure.  
Figure 3-2 Removing the Power Supply  
LJ-06509.AI7  
3–4 DIGITAL 2T-CCMHA-CB Central Office Memory Channel Hub Installation/Service Guide  
 
Removal and Replacement  
Figure 3-3 Disconnecting the Power Cable Connector and Removing the  
Power Supply  
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LJ-06514.AI7  
DIGITAL 2T-CCMHA-CB Central Office Memory Channel Hub Installation/Service Guide 3–5  
 
SES Template Word 7 Blank Page Fix by Peter LaQuerre  
 

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