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DIGITAL 2T-CCMHA-CB Central Office Memory Channel Hub Installation/Service Guide
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.