11
Release Notes for Cisco RF Gateway 10 in Cisco IOS Release 12.2SQ
OL-18677-10
New and Changed Information
The most critical function of the TCC card is distribution of the system clocking, in particular the
DOCSIS Timing Interface (DTI). The TCC card is a DTI client interface. It supports dual DTI external
input allowing DTI server redundancy. Based on the DTI input information, the TCC card generates
DOCSIS 10.24-MHz clock and time-stamp information to every line card in the chassis. All clocks and
DOCSIS information are redundant. When there is no external DTI clock, the TCC card provides an
internal DOCSIS DTI clock and time-stamp reference.
When two TCC cards are installed, they are configured as active and backup (redundant). If the TCC
card in the first slot is working at system power-up, it automatically becomes the active card and the TCC
card in the second slot becomes the backup card (typically slot 13 boots as the primary TCC card and
slot 14 as the secondary, but this is not mandatory).
In terms of the overall system high availability, the TCC cards work autonomously from the centralized
control mechanisms. Redundant TCC cards monitor each other’s priority information so that when the
active card fails, the active card role is transferred to the redundant backup card without loss of data.
The following is a summary of the TCC card’s functions and features:
•
Generates and distributes 10.24-MHz clock references and 32-bit time-stamp references to every
cable interface line card
•
Drives the LCD module used to display the system configuration and status information
•
Proxy control mechanism (via Supervisor cards) for the RF Switch cards
•
Front panel LEDs providing status and alarm indicators
•
Provides two RJ-45 ports supporting redundant DTI server sources
RFGW-10-PWR-DC1 (DC PEM)
The Cisco RFGW-10 system is powered by redundant DC PEMs. An individual PEM is capable of
providing 4536 watts of total output. Redundant modules work as a 1:1 redundancy configuration
supporting current sharing and online insertion and removal (OIR) (hot swapping).
Each PEM includes two 60A input lines that operate between –40 VDC and –72 VDC input voltages.
Proper configuration and operation requires that both DC inputs are properly wired. The PEM also
includes an earth ground connection (this is not power return) for grounding the chassis.
DC PEM features:
•
Closed frame, NEBS-compliant module design
•
Front-to-back airflow (exhaust air exits out of the rear of the chassis)
•
Power input range: –48 VDC to –60 VDC
•
4536W power capacity
•
Supports OIR (hot swap) and current sharing
•
Supports 1:1 redundancy (system can run with a single PEM)
•
CLI support for status and configuration
•
Remote shutdown feature
•
Front panel LED status and alarm indicators
