Datasheet

2-11
Cisco ONS 15454 SDH Reference Manual, R7.0
October 2008
Chapter 2 Common Control Cards
2.3.1 TCC2P Functionality
The TCC2P also originates and terminates a cell bus carried over the module. The cell bus supports links
between any two cards in the node, which is essential for peer-to-peer communication. Peer-to-peer
communication accelerates protection switching for redundant cards.
The node database, IP address, and system software are stored in TCC2P nonvolatile memory, which
allows quick recovery in the event of a power or card failure.
The TCC2P card performs all system-timing functions for each ONS 15454. It monitors the recovered
clocks from each traffic card and two BITS ports for frequency accuracy. The TCC2P card selects a
recovered clock, a BITS, or an internal Stratum 3 reference as the system-timing reference. You can
provision any of the clock inputs as primary or secondary timing sources. A slow-reference tracking loop
allows the TCC2P to synchronize with the recovered clock, which provides holdover if the reference is
lost.
For Software Release 6.0 and later, the TCC2P card supports a 64 kHz + 8 kHz composite clock BITS IN
as well as a BITS OUT clock of 6.312 MHz. The BITS on the system is configurable as E1, 2.048 MHz,
or 64 kHz, with E1 being the default. The BITS OUT clock runs at a rate determined by BITS IN, as
shown in Table 2-11.
A BITS output interface configured as 6.312 MHz complies with ITU-T G.703, Appendix II, Table II.4,
with a monitor level of –40 dBm +/– 4 dBm.
The TCC2P monitors both supply voltage inputs on the shelf. An alarm is generated if one of the supply
voltage inputs has a voltage that is out of the specified range.
Install TCC2P cards in Slots 7 and 11 for redundancy. If the active TCC2P fails, traffic switches to the
protect TCC2P. All TCC2P protection switches conform to protection switching standards when the
BER counts are not in excess of 1 * 10 exp – 3 and completion time is less than 50 ms.
The TCC2P card has two built-in RJ-45 Ethernet interface ports for accessing the system: one on the
front faceplate for on-site craft access and a second by means of the backplane to the port that is
accessible on the MIC-C/T/P FMEC, for user interfaces. The FMEC Ethernet interface is for permanent
LAN access and all remote access via TCP/IP as well as for Operations Support System (OSS) access.
The Ethernet interfaces have different IP addresses that are in different subnets.
An EIA/TIA-232 serial port on the faceplate allows for a craft interface in TL1 mode.
Note When using the LAN RJ-45 craft interface or back panel wirewrap LAN connection, the connection must
be 10BASE T, half duplex. Full duplex and autonegotiate settings should not be used because they might
result in a loss of visibility to the node.
Note Cisco does not support operation of the ONS 15454 SDH with only one TCC2P card. For full
functionality and to safeguard your system, always operate with two TCC2P cards.
Table 2-11 BITS Clocks
BITS IN BITS OUT
E1 E1 (default)
2.048 MHz (square wave clock) 2.048 MHz (square wave clock)
64 kHz 6.312 MHz