Identifying the Internal Components 2-7
U30 - USB 4-Port HUB USB2513
The SMSC USB2513 4-port hub is part of a family of low-power, OEM configurable, MTT
(Multi-Transaction translator) hub controller ICs.
The USB2517 provides 7 downstream ports for Base Station.
The SMSC hub supports Low-Speed (LS), Full-Speed (FS), and High-Speed (HS) devices
on all downstream ports.
The Upstream port is driven by HS5 from Hub U65.
The downstream ports are configured as follows:
HS8, HS9 - to Base Station E-Series I/O Panel USB 2.0 Ports, USB1, and USB2
HS10 - to Base Station E-Series MCU
U6 XR21V1414 High Speed USB to Four Channel UART
U6 converts a single High Speed USB 2.0 input into four serial Universal Asynchronous
Receiver Transmitters (UARTS).
The XR21V1414 is attached to the HS6 downstream port of U65. The USB interface is
fully compliant with Full Speed USB 2.0 Specification.
Each UART contains a large transmit and receive FIFO to optimize data throughput as
detailed below.
Data rates up to 12 Mbps
Fractional Baud Rates up to 12 Mbps
128 byte TX FIFO
384 byte RX FIFO
7, 8, or 9 data bits - 1 or 2 stop bits - Odd, even, mark, space, or no parity
Automatic Hardware Flow Control - (RTS/CTS or DTR/DSR)
Automatic Software Flow Control (Xon/Xoff)
Multi-drop and Half-Duplex Modes
On the Base Station E-Series Main Board, the four channel UART drives the following
I/O Panel connectors:
URAT1
– COM1 DB9 Powered DB9
URAT2
– COM2 DB9 Powered
URAT3
– COM3 - Customer Display Port
URAT4
– COM4 - IDN (RJ45 RS422/RS232 multi-function port)
A serial driver running on Tablet E-Series establishes virtual COM ports.
U31 XR21V1412L32 High Speed USB to Two Channel UART
U31 converts a single High Speed USB 2.0 input into two serial Universal Asynchronous
Receiver Transmitters (UARTS).
The XR21V1412L32 is attached to the HS7 downstream port of U65. The USB interface is
fully compliant with Full Speed USB 2.0 Specification.
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