Cyan Z-Series Engineering and Planning Guide Release 5.0
700-0023-05-00 Rev. 1 © 2013 Cyan, Inc. – All Rights Reserved. Page 129
2.17 Broadband Operating System Supervisor
The Broadband Operating System Supervisor (BOSS) card provides common control functionality to Cyan
Z77 nodes. At least one BOSS card is required in each Z77 shelf. Slots 1 and 2 of the chassis house
redundant BOSS cards. BOSS cards power the management plane, provide management and timing
interfaces, and contain the main system memory. In a network of Cyan nodes, BOSS cards on each Z77
node communicate with other nodes via a dedicated management LAN carried over the Optical Supervisory
Channel (OSC).
This release introduces the BOSS2 shelf control card.
The BOSS2 supports enhanced packet scalability,
including support for more than 500 Flow Domains.
The BOSS2 card is recommended for Z77 shelves
configured with the XC-2800 switch fabric modules.
BOSS or BOSS2 shelf control cards are typically
deployed in fault-tolerant pairs. The Cyan operating
system (CyOS) c
ontinually monitors both cards, elects
master and standby processors and checkpoints all data
between cards to ensure consistency. Going beyond
typical master/slave capabilities, CyOS maintains
existing dataplane connections even if both
BOSS/BOSS2 cards are removed from the chassis.
Each BOSS/BOSS2 control card maintains a gigabit
Ethernet connection to all other line cards. This
network is used for all inter-shelf communications.
BOSS/BOSS2 cards serve as staging locations for code
upgrades, distributing
code to all the line cards on each
shelf to simplify and accelerate the upgrade process.
BOSS/BOSS2 cards receive status, alarm, and
statistical information from all line cards. The
information is presented on standard interfaces (e.g.,
SNMP, syslog).
Loca
ted in the rear termination area of each Z77 shelf,
a BOSS Termination Module (BTM) houses the
physical connectors for management and timing
interfaces. A single BTM connects to both BOSS cards
in a redundant design. The BTM contains no active
electronics that can affect system reliability.
The BOSS/BOSS2 card includes a Stratum 3 compliant
timing subsystem. Timing inputs include DS1/E1, 64K
composite clock, 2M, and backplane sources. Line
cards supply clock references on one of two available
backplane busses. The BOSS/BOSS2 card distributes
8 kHz and 19.44
MHz references to all line cards in the
Z77 shelf and also supports DS1/E1 derived timing
outputs.
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