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Cisco MGX 8220 Installation and Configuration
Release 5.0, Part Number 78-6430-03 Rev. D0, November 2003
Chapter
Service Module Back Cards
HSSI Back Cards
The HSSI (High-Speed Serial Interface) back card supports two HSSI ports using a female SCSI-II
connectors.
DTE-to-DCE control is achieved through combination software controls and a “NULL MODEM”
connector.
Redundancy Back Cards
When the SRM is used to provide 1:N redundancy for T1/E1 service modules, the standby (redundant)
card set uses a special redundancy back card. There are three types of 4-port redundancy back cards:
R-DB15-4T1, R-DB15-4E1, and R-BNC-4E1. There are three types of 8-port redundancy back cards:
R-RJ48-T1-BC, R-RJ48-E1-BC, and R-SMB-E1-BC. The one you use depends upon the number of
ports, the line type (T1 or E1), and the connector type (RJ-48, DB-15 or BNC) of your service module.
(See Figure 4-16 and Figure 4-17.) When 1:N redundancy is invoked, the physical lines to the failed
service module back card are still used. However, the signals are still routed to and from the redundant
back card.