Category Archives: IT

Canada Phone provider network band frequence

IT, Phone

 

chart

 

LTE

Bell/Telus :  LTE AWS (1700 MHz) or LTE 700 MHz bands, or UMTS/HSPA compatible on 850/1900 MHz bands.

 

Device:

Ipad mini Cell:

  • UMTS/HSPA/HSPA+/DC-HSDPA (850, 900, 1700/2100, 1900, 2100 MHz); GSM/EDGE (850, 900, 1800, 1900 MHz)
  • CDMA EV-DO Rev. A and Rev. B (800, 1900 MHz)
  • LTE (Bands 1, 2, 3, 4, 5, 7, 8, 13, 17, 18, 19, 20, 25, 26)3

Sumsung:

  • Network compatibility
    LTE
  • Maximum download speed
    Up to 75 Mbps
  • LTE compatibility
    Yes
  • HSPA/UMTS compatibility
    850/1900/2100 MHz
  • GPRS/EDGE compatibility
    850/900/1800/1900 MHz

1. Telus (Koodo)
2G
CDMA 850/1900
EVDO 850/1900

3G (and fake 4G)
HSDPA 850/1900
HSPA+ 850/1900
UMTS 850/1900
WCDMA 850/1900
1x EV-DO CDMA2000

4G (called 4G+)
LTE 1700/2100
——————————————————————–
2. Bell (Virgin Mobile, PC Mobility)

2G
CDMA 850/1900
EVDO 850/1900

3G (and fake 4G)
HSDPA 850/1900
HSPA+ 850/1900
UMTS 850/1900
WCDMA 850/1900
1x EV-DO CDMA2000

4G
LTE 1700
—————————————————————————
3. Rogers (Fido, Petro-Canada Mobility)

2G
GSM 850/1900
GPRS 850/1900
EDGE 850/1900

3G (and fake 4G)
HSDPA 850/1900
HSPA+ 850/1900
UMTS 850/1900
WCDMA 850/1900

4G
LTE 1700

TRACE for win32

IT 
// TRACE macro for win32
#ifndef __TRACE_H__850CE873
#define __TRACE_H__850CE873

#include <crtdbg.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>

#ifdef _DEBUG
#define TRACEMAXSTRING	1024

char szBuffer[TRACEMAXSTRING];
inline void TRACE(const char* format,...)
{
	va_list args;
	va_start(args,format);
	int nBuf;
	nBuf = _vsnprintf(szBuffer,
				   TRACEMAXSTRING,
				   format,
				   args);
	va_end(args);

	_RPT0(_CRT_WARN,szBuffer);
}
#define TRACEF _snprintf(szBuffer,TRACEMAXSTRING,"%s(%d): ", \
				&strrchr(__FILE__,'\\')[1],__LINE__); \
				_RPT0(_CRT_WARN,szBuffer); \
				TRACE
#else
// Remove for release mode
#define TRACE  ((void)0)
#define TRACEF ((void)0)
#endif

#endif // __TRACE_H__850CE873

study note ideas

ideas, IT

Pages online are good to read.  when we want to use it, learn it, study it, note it, it’s diffcult to use it as if I own the page as my book.  where i can

put highlight

comment

or even draw something

and it need to be private my version , so it’s easier to read next time for me.

 

List system Normal user account ONLY

IT

PNET_DISPLAY_USER pBuff, p;
DWORD res, dwRec, i = 0;

do // begin do
{
//
// Call the NetQueryDisplayInformation function;
// specify information level 3 (group account information).
//
res = NetQueryDisplayInformation(NULL, 1, i, 100, MAX_PREFERRED_LENGTH, &dwRec,(PVOID *) &pBuff);
//
// If the call succeeds,
//
if((res==ERROR_SUCCESS) || (res==ERROR_MORE_DATA))
{
p = pBuff;
for(;dwRec>0;dwRec–)
{
//
// Print the retrieved group information.
//
CW2A name( p->usri1_name );
bool bNormalAccount=false;

if(p->usri1_flags & UF_NORMAL_ACCOUNT&& !(p->usri1_flags & UF_ACCOUNTDISABLE)&& !(p->usri1_flags & UF_PASSWD_NOTREQD))
{
bNormalAccount=true;
TRACE(“Normal account %s\n”,name.m_szBuffer);
}

//
i = p->usri1_next_index;
p++;
}
//
// Free the allocated memory.
//
NetApiBufferFree(pBuff);
}
else
printf(“Error: %u\n”, res);
//
// Continue while there is more data.
//
} while (res==ERROR_MORE_DATA); // end do

TCP window scaling (Windows)

IT

Tcp1323Opts

Tcp1323Opts

HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters

 

http://technet.microsoft.com/en-us/library/cc757402(v=ws.10).aspx

 

Windows 2003

http://support.microsoft.com/default.aspx?scid=kb;en-us;912222

Data type Range Default value
REG_DWORD 0 | 1 | 2 | 3 3

Description

Specifies whether TCP uses the timestamping and window scaling features described in RFC 1323, TCP Extensions for High Performance.

Window scaling permits TCP to negotiate a scaling factor for the TCP receive window size, allowing for a very large TCP receive window of up to 1 GB. The TCP receive window is the amount of data that the sending host can send at one time on a connection.

Timestamps help TCP measure round trip time (RTT) accurately in order to adjust retransmission timeouts. The Timestamps option provides two timestamp fields of 4 bytes each in the TCP header, one to record the time the initial transmission is sent and one to record the time on the remote host.

This entry is a 2-bit bitmask. The lower bit determines whether scaling is enabled; the higher bit determines whether timestamps are enabled. To enable a feature, set the bit representing the feature to 1. To disable a feature, set its bit to 0.

Value Meaning
0 (00) Timestamps and window scaling are disabled.
1 (01) Window scaling is enabled.
2 (10) Timestamps are enabled.
3 (11) Timestamps and window scaling are enabled.