LATENTRED

Overview

LATENTRED is a 1U layer-2 Ethernet switch.

Ports:

24x 10/100/1000 base-T, using TI DP83867 SGMII PHY
4x 10Gbase-R SFP+
1x 10/100/1000 base-T dedicated management port (management not possible from normal fabric interfaces)
RS-232 UART console using Cisco-style RJ45 connector

Block-level overview:

Power supply (TBD).
- COTS module of some sort
- 120V mains to 12V DC 5A (expected actual power usage is under 50W worst case)
- TODO: 48V DC input option
Main board (Multech 6-8 layer)
- FPGA: Xilinx Kintex-7, -2 speed grade, FBG484 package. Gate capacity TBD.
- Management / IO expander card: INTEGRALSTICK (FIXME link here)
- SFP+ interfaces
- Management PHY / console connector
Backplane (OSHPark 4-layer)
- Connect to main board and line cards via Samtec Q-strip (QTH-040-xx-DP)
- Possibly use DS25BR440TSQX (LVDS buffer) or DS110DF410SQ (LVDS retimer) if we have issues with SI
- First spin will be entirely passive
8x 1000base-T line card (OSHPark 4-layer)
- 3 cards, 8 PHYs each
- Backplane connection
  - 8x SGMII
  - 5V power (4 pins each power/ground)
  - Lots of signal grounds
  - MDIO
  - I2C
  - Hardware reset (broadcast to all PHYs)
  - Power-good output?
Tentative: 8x 1000base-X line card (OSHPark 4-layer)
- 8 SFP ports per card, using DS110DF410SQ to clean up signal from FPGA IO pins