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T1/E1 and T3/E3 Transformer Se

时间：2009-04-20 | 栏目：通信网络 | 点击：次

Abstract: This application note lists vender transformers that meet the specifications required for use with Maxim Single-Chip Transceivers (SCTs) and Line Interface Units (LIUs). Recommended transformers are made based on the following transformer specifications: turns ratio, primary inductance, leakage inductance, interwinding capacitance, and DC resistance for both 5V and 3.3V operation. Actual results are dependant on the integrity of the PCB design and other termination circuitry and should be verified by the customer.

Introduction

This application note applies to the following products:

T1/E1 LIUs T1 SCTs E1 SCTs T1/E1 SCTs T1/E1 Ethernet/Serial TDM T3/E3 LIUs T3/E3 SCTs
DS2148 DS2151 DS2153 DS2156 DS33R11 DS3150 DS3170
DS21348 DS2152 DS2154 DS2155 DS33R41 DS3151 DS3171
DS21Q48 DS21352 DS21354 DS21Q55   DS3152 DS3172
DS21Q348 DS21552 DS21554 DS21455   DS3153 DS3173
DS21448 DS21Q552 DS21Q554 DS21458   DS3154 DS3174
DS2149 DS21Q352 DS21Q354 DS26502   DS3251 DS3181
DS21349 DS2196 DS21Q59 DS26503   DS3252 DS3182
DS26303   DS21Q58 DS26504   DS3253 DS3183
DS26324   DS21Q50 DS26518   DS3254 DS3184
DS26334     DS26519   DS32504  
      DS26521   DS32506  
      DS26522   DS32508  
      DS26524   DS32512  
      DS26528      

Table 1 shows the specifications for our 5V devices and Table 2 shows the specifications for our 3.3V devices. The specifications for selecting an appropriate transformer are given in the data sheets for each device and repeated below for simplicity. Table 3 lists the transformer part numbers from multiple vendors and matches them with the parts listed above.

Table 1. Transformer Specifications for 5V Operation
Specification Recommended Value
Turns Ratio, 5V Applications 1:1 (RX) and 1:15 or 1:1.36 (TX) ±5%
Primary Inductance 600µH minimum
Leakage Inductance 1.0µH maximum
Interwinding Capacitance 40pF maximum
 
Transmit Transformer DC Resistance
Primary (Device Side) 1.2Ω maximum
Secondary 1.2Ω maximum
 
Receive Transformer DC Resistance
Primary (Device Side) 1.2Ω maximum
Secondary 1.2Ω maximum

Table 2. Transformer Specifications for 3.3V Operation
Specification Recommended Value
Turns Ratio, 3.3V Applications 1:1 (RX) and 1:2 (TX) ±2%
Primary Inductance 600µH minimum
Leakage Inductance 1.0µH maximum
Interwinding Capacitance 40pF maximum
 
Transmit Transformer DC Resistance
Primary (Device Side) 1.0Ω maximum
Secondary 2.0Ω maximum
 
Receive Transformer DC Resistance
Primary (Device Side) 1.5Ω maximum
Secondary 1.2Ω maximum

Table 3. Transformer Part Information
Vendor Part Turns Ratio No.
of Ports		 Package Type No.
of Pins		 Temp
Range		 Hierarchy Maxim Device
Pulse PE-65388 1:1.15CT TX only Through Hole 6 0°C to
+70°C		 T1/E1 DS2151, DS2152, DS2153, DS2154, DS21552, DS21Q552, DS21554, DS21Q554
PE-65586 1:1.36CT TX only Through Hole 6 0°C to
+70°C		 T1/E1 DS2151, DS2152, DS2153, DS2154, DS21352, DS21Q352, DS21354, DS21Q354, DS21552, DS21Q552, DS21554, DS21Q554
PE-65351 1:2CT TX only Through Hole 6 0°C to
+70°C		 T1/E1 DS2196, DS21348, DS21Q348, DS21448, DS21352, DS21Q352, DS21354, DS21Q354
PE-64936 1CT:1 RX only Through Hole 6 0°C to
+70°C		 T1/E1 DS2196, DS2151, DS2152, DS2153, DS2154, DS21348, DS21Q348, DS21448, DS2148, DS21Q48, DS21352, DS21Q352, DS21354, DS21Q354, DS21552, DS2121Q552, DS21554, DS21Q554
PE-65565 1:1.15CT and 1:2CT 1 Through Hole 6 0°C to
+70°C		 T1/E1 DS2151, DS2152, DS2153, DS2154, DS21552, DS21Q552, DS21554, DS21Q554
TX1315 1CT:1CT RX only Surface Mount 6 -40°C to
+85°C		 T1/E1 DS2196, DS2151, DS2152, DS2153, DS2154, DS21348, DS21Q348, DS21448, DS2148, DS21Q48, DS21352, DS21Q352, DS21354, DS21Q354, DS21552, DS21Q552, DS21554, DS21Q554
TX1320 1CT:1.36CT TX Only Surface Mount 6 -40°C to
+85°C		 T1/E1 DS2151, DS2152, DS2153, DS2154, DS21352, DS21Q352, DS21354, DS21Q354, DS21552, DS21Q552, DS21554, DS21Q554
TX1277 1CT:1CT and 1CT:2CT 1 Surface Mount 14 -40°C to
+85°C		 T1/E1 DS2155, DS2156, DS21Q55, DS21455, DS21458, DS21Q50, DS21Q58, DS21Q59, DS33R11, DS33R41
PE-68882 1CT:1.15CT and 1CT:1CT 1 Surface Mount 14 -40°C to
+85°C		 T1/E1 DS2151, DS2152, DS2153, DS2154, DS21552, DS21Q552, DS21554, DS21Q554
PE-64952 1:2CT and 1:1.36 1 Through Hole 14 0°C to
+70°C		 T1/E1 DS2151, DS2152, DS2153, DS2154, DS2148, DS21Q48, DS21552, DS21Q552, DS21554, DS21Q554
PE-64953 1:2CT and 1:2CT 1 Through Hole 14 0°C to
+70°C		 T1/E1 DS2155, DS2156, DS21Q55, DS21455, DS21458, DS21Q50, DS21Q58, DS21Q59
PE-65865 1:1.15CT and 1CT:2CT 1 Surface Mount 16 0°C to
+70°C		 T1/E1 DS2151, DS2152, DS2153, DS2154, DS21552, DS21Q552, DS21554, DS21Q554
T1076 1:1.15CT and 1CT:2CT 1 Surface Mount 16 -40°C to
+85°C		 T1/E1 DS2151, DS2152, DS2153, DS2154, DS21552, DS21Q552, DS21554, DS21Q554
T1136 1CT:1CT and 1CT:1.36CT 1 Surface Mount 16 0°C to
+70°C		 T1/E1 DS2151, DS2152, DS2153, DS2154, DS2148, DS21Q48, DS21552, DS21Q552, DS21554, DS21Q554
PE-68678 1CT:1CT and 1CT:2CT 1 Surface Mount 16 0°C to
+70°C		 T1/E1 DS2196, DS21348, DS21Q348, DS21448, DS21352, DS21Q352, DS21354, DS21Q354
PE-68877 1CT:1CT and 1CT:2CT 1 Surface Mount 12 -40°C to
+85°C		 T1/E1 DS33R11, DS33R41
T1094 1CT:1CT and 1CT:2CT 1 Surface Mount 16 -40°C to
+85°C		 T1/E1 DS2155, DS2156, DS21Q55, DS21455, DS21458, DS21Q50, DS21Q58, DS21Q59
TX1099 1CT:1:0.8 and 1CT:1:0.8 1 Surface Mount 16 -40°C to
+85°C		 T1/E1 DS2155, DS2156, DS21Q55, DS21455, DS21458, DS21348, DS21Q348, DS21448, DS26502, DS26503, DS26504, DS26521, DS26522, DS33R11
TX1467 1CT:1:1 and 1CT:1:1 1 Surface Mount 16 -40°C to
+85°C		 T1/E1 DS2155, DS2156, DS21Q55, DS21455, DS21458, DS21Q50, DS21Q58, DS21Q59
TX1473 1:2 and 1:1 4 Surface Mount 32 -40°C to
+85°C		 T1/E1 DS2155, DS2156, DS21Q55, DS21455, DS21458, DS21Q50, DS21Q58, DS21Q59
T1068 1:2CT and 1:1CT 4 Surface Mount 40 0°C to
+70°C		 T1/E1 DS2155, DS2156, DS21Q55, DS21455, DS21458, DS21Q50, DS21Q58, DS21Q59
TX1475 1CT:1CT and 1CT:2CT 4 Surface Mount 32 -40°C
to
+85°C		 T1/E1 DS26324, DS26334, DS26518, DS26519, DS26524, DS26528
T1114 1CT:1CT and 1CT:2CT 4 Surface Mount 40 -40°C to
+85°C		 T1/E1 DS26303
T1108 1:2CT and 1:1CT 4 Surface Mount 40 -40°C to
+85°C		 T1/E1 DS2155, DS2156, DS21Q55, DS21455, DS21458, DS21Q50, DS21Q58, DS21Q59
TX1292 1:1.36 and 1:1 4 Surface Mount 40 -40°C to
+85°C		 T1/E1 DS2151, DS2152, DS2153, DS2154, DS2148, DS21Q48, DS21552, DS21Q552, DS21554, DS21Q554
PE-65968 1:2CT RX or TX Surface Mount 6 0°C to
+70°C		 T3/E3 DS3150, DS3151, DS3152, DS3153, DS3154, DS3181, DS3182, DS3183, DS3184, DS3251, DS3252, DS3253, DS3254
PE-65969 1:2CT RX or TX Through Hole 6 0°C to
+70°C		 T3/E3 DS3150, DS3151, DS3152, DS3153, DS3154, DS3170, DS3171, DS3172, DS3173, DS3174, DS3181, DS3182, DS3183, DS3184
T3002 1:2CT RX or TX Surface Mount 6 -40°C to
+85°C		 T3/E3 DS3150, DS3151, DS3152, DS3153, DS3154, DS3181, DS3182, DS3183, DS3184
T3012 1:2CT RX or TX Surface Mount 6 -40°C to
+85°C		 T3/E3 DS3150, DS3151, DS3152, DS3153, DS3154, DS3181, DS3182, DS3183, DS3184
T3021 1:2CT and 1:2CT 1 Surface Mount 16 -40°C to
+85°C		 T3/E3 DS3150, DS3151, DS3152, DS3153, DS3154, DS3181, DS3182, DS3183, DS3184
T3047 1:1 4 Surface Mount 32 -40°C to
+85°C		 T3/E3 DS32501, DS32502, DS32503, DS32504, DS32512
T3049 1:2 4 Surface Mount 32 -40°C to
+85°C		 T3/E3 DS3150, DS3151, DS3152, DS3153, DS3154, DS3170, DS3171, DS3172, DS3173, DS3174, DS3181, DS3182, DS3183, DS3184
HALO Electronics TG38-1505A 1:1.15CT TX only Through Hole 6 -40°C to
+85°C		 T1/E1 DS2151, DS2152, DS2153, DS2154, DS21552, DS21Q552, DS21554, DS21Q554
TD70-1205A 1:1.36CT TX only Through Hole 6 0°C to
+70°C		 T1/E1 DS2151, DS2152, DS2153, DS2154, DS21552, DS21Q552, DS21554, DS21Q554
TD15-1205A 1:2CT TX only Through Hole 6 0°C to
+70°C		 T1/E1 DS2196, DS21348, DS21Q348, DS21448, DS21352, DS21Q352, DS21354, DS21Q354
TD02-1205A 1CT:1 RX only Through Hole 6 0°C to
+70°C		 T1/E1 DS2196, DS2151, DS2152, DS2153, DS2154, DS21348, DS21Q348, DS21448, DS2148, DS21Q48, DS21352, DS21Q352, DS21354, DS21Q354, DS21552, DS2121Q552, DS21554, DS21Q554
TG04-1505NS 1CT:1CT RX only Surface Mount 6 -40°C to
+85°C		 T1/E1 DS2196, DS2151, DS2152, DS2153, DS2154, DS21348, DS21Q348, DS21448, DS2148, DS21Q48, DS21352, DS21Q352, DS21354, DS21Q354, DS21552, DS2121Q552, DS21554, DS21Q554
TG15-1505NS 1CT:2CT TX only Surface Mount 6 -40°C to
+85°C		 T1/E1 DS2196, DS21348, DS21Q348, DS21448, DS21352, DS21Q352, DS21354, DS21Q354
TG38-1505NS 1:1.15CT TX only Surface Mount 6 -40°C to
+85°C		 T1/E1 DS2151, DS2152, DS2153, DS2154, DS21552, DS21Q552, DS21554, DS21Q554
TG70-1505NS 1:1.36CT TX only Surface Mount 6 -40°C to
+85°C		 T1/E1 DS2151, DS2152, DS2153, DS2154, DS21552, DS21Q552, DS21554, DS21Q554
TD63-1505D 1:1.15CT and 1:2CT 1 Through Hole 14 -40°C to
+85°C		 T1/E1 DS2151, DS2152, DS2153, DS2154, DS21552, DS21Q552, DS21554, DS21Q554
TG63-1505N1 1:1.15CT and 1CT:2CT 1 Surface Mount 16 -40°C to
+85°C		 T1/E1 DS2151, DS2152, DS2153, DS2154, DS21552, DS21Q552, DS21554, DS21Q554
TG35-1505N1 1CT:1.15CT and 1CT:1CT 1 Surface Mount 16 -40°C to
+85°C		 T1/E1 DS2151, DS2152, DS2153, DS2154, DS21552, DS21Q552, DS21554, DS21Q554
TGSP-1467N1 1CT:1:1 and 1CT:1:1 1 Surface Mount 16 -40°C to
+85°C		 T1/E1 DS2155, DS2156, DS21Q55, DS21455, DS21458, DS21Q50, DS21Q58, DS21Q59
TG28-1505N1 1CT:1CT and 1CT:1.36C 1 Surface Mount 16 -40°C to
+85°C		 T1/E1 DS2151, DS2152, DS2153, DS2154, DS21352, DS21Q352, DS21354, DS21Q354, DS21552, DS21Q552, DS21554, DS21Q554
TG74-1205N1 1CT:1CT and 1CT:2CT 1 Surface Mount 16 0°C to
+70°C		 T1/E1 DS2196, DS21348, DS21Q348, DS21448, DS21352, DS21Q352, DS21354, DS21Q354
TG83-S006NU 1:2 and 1:1 4 Surface Mount 32 -40°C to
+85°C		 T1/E1 DS2155, DS2156, DS21Q55, DS21455, DS21458, DS21Q50, DS21Q58, DS21Q59
TG74-1205N1 1CT:1CT and 1CT:2CT 1 Surface Mount 16 0°C to
+70°C		 T1/E1 DS2196, DS21348, DS21Q348, DS21448, DS21352, DS21Q352, DS21354, DS21Q354
TG07-0206NS 1:2CT TX or RX only Surface Mount 6 0°C to
+70°C		 T3/E3 DS3150, DS3151, DS3152, DS3153, DS3154
TD07-0206NE 1:2CT TX or RX only Through Hole 6 0°C to
+70°C		 T3/E3 DS3150, DS3151, DS3152, DS3153, DS3154
TG07-0356NS 1:2CT TX or RX only Surface Mount 6 0°C to
+70°C		 T3/E3 DS3150, DS3151, DS3152, DS3153, DS3154
TG07-0406N1 1:2CT and 1:2CT 1 Surface Mount 16 -40°C to
+85°C		 T3/E3 DS3150, DS3151, DS3152, DS3153, DS3154
TG05-0206NU 1:2 4 Surface Mount 32 -40°C to
+85°C		 T3/E3 DS3150, DS3151, DS3152, DS3153, DS3154
Bel S553-3855-02 1:1.15CT and 1CT:2CT 1 Surface Mount 16 0°C to
+70°C		 T1/E1 DS2151, DS2152, DS2153, DS2154, DS21552, DS21Q552, DS21554, DS21Q554
S553-0013-02 1:2CT and 1:1.36 1 Surface Mount 16 0°C to
+70°C		 T1/E1 DS2151, DS2152, DS2153, DS2154, DS2148, DS21Q48, DS21552, DS21Q552, DS21554, DS21Q554
S553-0013-01 1CT:2CT and 1:1 1 Surface Mount 16 0°C to
+70°C		 T1/E1 DS21352, DS21354, DS2148, DS2155, DS2196, DS21Q352, DS21Q354, DS21Q48
S554-3184-01 1:2CT 1 Surface Mount 6 0°C to
+70°C		 T3/E3 DS3150, DS3151, DS3152, DS3153, DS3154, DS3181, DS3182, DS3183, DS3184
0554-3184-01 1:2CT 1 Through Hole 6 0°C to
+70°C		 T3/E3 DS3150, DS3151, DS3152, DS3153, DS3154, DS3181, DS3182, DS3183, DS3184
S553-6500-H5 1CT:1:1 and 1CT:1:1 4 Surface Mount 32 -40°C to
+85°C		 T1/E1 DS2151, DS2152, DS2153, DS2154, DS21552, DS21554, DS21Q552, DS21Q554
S554-6500-21 1:2 4 Surface Mount 32 -40°C to
+85°C		 T3/E3 DS3150, DS3151, DS3152, DS3153, DS3154, DS3181, DS3182, DS3183, DS3184
S553-6500-C8 1:2 and 1:1 4 Surface Mount 32 -40°C to
+85°C		 T1/E1 DS2155, DS2156, DS21Q55, DS21455, DS21458, DS21Q50, DS21Q58, DS21Q59
0553-0013-RC 1:1.15CT TX only Through Hole 6 0°C to
+70°C		 T1/E1 DS2151, DS2152, DS2153, DS2154, DS21552, DS21Q552, DS21554, DS21Q554
0553-0013-BC 1CT:1 RX only Through Hole 6 0°C to
+70°C		 T1/E1 DS2196, DS2151, DS2152, DS2153, DS2154, DS21348, DS21Q348, DS21448, DS2148, DS21Q48, DS21352, DS21Q352, DS21354, DS21Q354, DS21552, DS2121Q552, DS21554, DS21Q554
0553-0013-1J 1:2CT and 1:2CT 1 Through Hole 14 0°C to
+70°C		 T1/E1 DS2155, DS2156, DS21Q55, DS21455, DS21458, DS21Q50, DS21Q58, DS21Q59
0553-0013-2J 1:2CT and 1:1.36 1 Through Hole 14 0°C to
+70°C		 T1/E1 DS2151, DS2152, DS2153, DS2154, DS2148, DS21Q48, DS21552, DS21Q552, DS21554, DS21Q554
T2099S 1CT:1CT and 1CT:1.36CT 1 Surface Mount 16 -40°C to
+85°C		 T1/E1 DS2151, DS2152, DS2153, DS2154, DS2148, DS21Q48, DS21552, DS21Q552, DS21554, DS21Q554
T2006 1:1.15CT TX only Through Hole 6 0°C to
+70°C		 T1/E1 DS2151, DS2152, DS2153, DS2154, DS21552, DS21Q552, DS21554, DS21Q554
T2007 1:1.36CT TX only Through Hole 6 0°C to
+70°C		 T1/E1 DS2151, DS2152, DS2153, DS2154, DS21352, DS21Q352, DS21354, DS21Q354, DS21552, DS21Q552, DS21554, DS21Q554
T2028S 1:1.15CT and 1CT:2CT 1 Surface Mount 16 0°C to
+70°C		 T1/E1 DS2151, DS2152, DS2153, DS2154, DS21552, DS21Q552, DS21554, DS21Q554
T0034 1:2CT TX only Through Hole 6 0°C to
+70°C		 T1/E1 DS2196, DS21348, DS21Q348, DS21448, DS21352, DS21Q352, DS21354, DS21Q354
S553-6500-76 1CT:1CT and 1CT:2CT 1 Surface Mount 16 0°C to
+70°C		 T1/E1 DS2196, DS21348, DS21Q348, DS21448, DS21352, DS21Q352, DS21354, DS21Q354
S553-6500-E6 1CT:1CT and 1CT:2CT 1 Surface Mount 16 -40°C to
+85°C		 T1/E1 DS21348, DS2155, DS2156, DS21Q55, DS21455, DS21458, DS21Q50, DS21Q58, DS21Q59
S553-6500-H6 1CT:1:0.8 and 1CT:1:0.8 1 Surface Mount 32 -40°C to
+85°C		 T1/E1 DS21348, DS21Q348, DS21448, DS2155, DS2156
Coev PT-311 1:1.36CT TX only Through Hole 6 0°C to
+70°C		 T1/E1 DS2151, DS2152, DS2153, DS2154, DS21352, DS21Q352, DS21354, DS21Q354, DS21552, DS21Q552, DS21554, DS21Q554
PT-311ET 1:1.36CT TX only Through Hole 6 -40°C to
+85°C		 T1/E1 DS2151, DS2152, DS2153, DS2154, DS21352, DS21Q352, DS21354, DS21Q354, DS21552, DS21Q552, DS21554, DS21Q554
PT-306 1:2CT TX only Through Hole 6 0°C to
+70°C		 T1/E1 DS2155, DS2156, DS21Q55, DS21455, DS21458, DS21Q50, DS21Q58, DS21Q59
PT-306ET 1:2CT TX only Through Hole 6 -40°C to
+85°C		 T1/E1 DS2155, DS2156, DS21Q55, DS21455, DS21458, DS21Q50, DS21Q58, DS21Q59
PT-312 1CT:1 RX only Through Hole 6 0°C to
+70°C		 T1/E1 DS2196, DS2151, DS2152, DS2153, DS2154, DS21348, DS21Q348, DS21448, DS2148, DS21Q48, DS21352, DS21Q352, DS21354, DS21Q354, DS21552, DS2121Q552, DS21554, DS21Q554
PT-312ET 1CT:1 RX only Through Hole 6 -40°C to
+85°C		 T1/E1 DS2196, DS2151, DS2152, DS2153, DS2154, DS21348, DS21Q348, DS21448, DS2148, DS21Q48, DS21352, DS21Q352, DS21354, DS21Q354, DS21552, DS2121Q552, DS21554, DS21Q554
PT-323 1:1 RX only Through Hole 6 0°C to
+70°C		 T1/E1 DS2196, DS2151, DS2152, DS2153, DS2154, DS21348, DS21Q348, DS21448, DS2148, DS21Q48, DS21352, DS21Q352, DS21354, DS21Q354, DS21552, DS2121Q552, DS21554, DS21Q554
PT-323ET 1:1 RX only Through Hole 6 -40°C to
+85°C		 T1/E1 DS2196, DS2151, DS2152, DS2153, DS2154, DS21348, DS21Q348, DS21448, DS2148, DS21Q48, DS21352, DS21Q352, DS21354, DS21Q354, DS21552, DS2121Q552, DS21554, DS21Q554
SMD601-05 1:1.15CT and 1CT:2CT 1 Surface Mount 16 0°C to
+70°C		 T1/E1 DS2151, DS2152, DS2153, DS2154, DS21552, DS21Q552, DS21554, DS21Q554
SMD601-05ET 1:1.15CT and 1CT:2CT 1 Surface Mount 16 -40°C to
+85°C		 T1/E1 DS2151, DS2152, DS2153, DS2154, DS21552, DS21Q552, DS21554, DS21Q554
SMD606-05 1CT:1CT and 1CT:2CT 1 Surface Mount 16 0°C to
+70°C		 T1/E1 DS21352, DS21354
SMD606-05ET 1CT:1CT and 1CT:2CT 1 Surface Mount 16 -40°C to
+85°C		 T1/E1 DS21352, DS21354
SM01-T304M 1:2CT 1 Surface Mount 6 -40°C to
+85°C		 T3/E3 DS3150, DS3151, DS3152, DS3153, DS3154, DS3181, DS3182, DS3183, DS3184
MGBBT-00019 1:2 4 Surface Mount 32 -40°C to
+85°C		 T3/E3 DS3150, DS3151, DS3152, DS3153, DS3154, DS3181, DS3182, DS3183, DS3184


T1/E1 and T3/E3 Transformer Selection Information

If you have further questions on T1/E1 or T3/E3 transformer selection for our devices, please contact the Telecommunication Applications support team by email at telecom.support@dalsemi.com, or call 01-972-371-6555. For more information about specific transformers, please consult the manufacturers using the information listed below.

Vendor List
Address Phone Fax Website
Pulse Engineering Inc.
12220 World Trade Drive
San Diego, CA 92128		 858-674-8100 858-674-8262 www.pulseeng.com
HALO Electronics Inc.
1861 Landings Drive
Mountain View, CA 94043		 650-903-3800 650-903-9300 www.haloelectronics.com
Bel Fuse Inc.
206 Van Vorst Street
Jersey City, NJ 07302		 201-432-0463 201-432-9542 www.belfuse.com
Coev Magnetics (Tyco)
3003 9th Avenue SW
Watertown, SD 57201		 605-886-3326 605-884-3640 www.coev.net

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