IBM PowerPRS Q-64G
Packet Routing Switch
Preliminary
The PowerPRS Q-64G is designed to provide OC-192 attachment. To meet these transmission requirements
and provide 16-Gbps throughput per port, multiple PowerPRS Q-64Gs are configured for speed expansion.
There are two standard multiple-device configurations:
• 512-Gbps configuration (with eight devices providing 32 input and output ports)
• 256-Gbps configuration (with four devices providing 16 input and output ports)
Synchronization is not required between input ports. However, packets on a given port are always received
or transmitted at a fixed rate according to the packet length. Four levels of packet priority provide quality-of-
service support. A serial grant mechanism controls ingress and egress data flow.
The PowerPRS Q-64G supports redundant switch-plane operation. It includes color-coded scheduled
switchover that operates without packet loss. Scheduled switchover is a system-level function that requires
hardware and software interaction. The PowerPRS Q-64G performs the hardware assist for this function.
1.3 Ordering Information
Part Number
Description
Single-Device Throughput
64 Gbps
Aggregate Throughput
For OC-192 attachment:
256 Gbps (four devices) or
512 Gbps (eight devices)
IBM3229P2815
IBM Packet Routing Switch
1.4 Conventions and Notation
Throughout this document, standard IBM notation is used, meaning that bits and bytes are numbered in
ascending order from left to right. For a four-byte word, bit 0 is the most significant bit (MSB) and bit 31 is the
least significant bit (LSB).
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Notation for bit encoding is as follows:
• Hexadecimal values are preceded by an x and enclosed in single quotation marks. For example: x‘0A00’.
• Binary values in sentences appear in single quotation marks. For example: ‘1010’.
Differential pairs are designated by an _P for the positive signal and an _N for the negative signal at the end
of the signal name. For example: PortDataIn[0]_P and PortDataIn[0]_N.
Nondifferential signals that are active low are designated by a # symbol at the end of the signal name. For
example: InterruptOut#.
General Information
Page 14 of 199
prsq-64g.01.fm
December 20, 2001
IBM [ IBM ]
