Chapter 2 Introduction
A list of product variants to which this manual applies can be found in Section 2.11, “Applicability” on page 14.
2.3Power Supplies
An SS7G21 or SS7G22 product can be ordered with one of the following:
•
•
The Power Supply Cage, which is mounted towards the left rear of the chassis, contains the Power Supply Modules. Both the AC and
•One Power Supply Module installed (this is the factory standard setting). Units configured in this manner can supply a fully loaded product, but do not provide dual redundancy. The second position contains a filler module.
•Two Power Supply Modules installed. Units configured in this manner are dual redundant. In the event of a failure of any one Power Supply Module, the operation of the product is unaffected.
When the product is configured with two Power Supply Modules, the
Caution: The Power Supply Modules used in the
2.4Server Board
The chassis incorporates a Server Board incorporating dual Intel Xeon processors with 512 KB L2 cache and 1 GB DRAM DIMM memory. The Server Board has a Riser Board, which supports the fitting of up to three
2.5Hard Disk Drive
As standard, a Hard Disk Drive (HDD) is installed in a drive bay in the front of the chassis, accessible by removing the front bezel of the product. A spare assembly is available for the HDD, see Chapter 12, “Part Number Reference”.
2.6CD-ROM Drive
A
2.7SS7 Signaling Boards
The SS7G21 and SS7G22 use intelligent
The number of SS7 signaling links that can be terminated by an SS7 Signaling Board depends on the board type as described below. Signaling links may be presented either as a timeslot on an external PCM interface, or as a synchronous V.11 serial interface when provided by the board. Signaling links can operate at 64kb/s, 56kb/s or 48kb/s. The SS7 Signaling Boards also support configurable clock recovery priorities with automatic switching to a new clock source on failure, and automatic restoration on recovery of the failed clock source.
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