IVS Parameters

Site name Westford GGAO Kokee Site name TTW1   TTW2 Site name Yebes Yebes   Site name Hobart12 Site name Ishioka Ishioka Kashima Site name ONSA13NE ONSA13SW notes Site name Badary Zelenchukskaya
SEFD (Jy) broadband broadband broadband Receiver type Tri-band Wideband Receiver type tri-band Broad-band SEFD (Jy) broadband Receiver type tri-band QRFH QRFH SEFD (Jy) broadband broadband Receiver type Tri-band Tri-band
2 2500 2500 2500 SEFD (Jy) SEFD (Jy) 2 ~3500? SEFD (Jy) 2 ? ? not know yet SEFD (Jy)
5 2500 2500 2500 2,3 1500 4,0 1100 2 1700 3GHz? ? 5 ~3000? 2 1400 (no value) (no value) 5 ? ? not know yet 2,4 1000* 1100*
9 2500 2500 2500 8,5 800 6,0 1000 9 1600 8GHz? 2600 9 ~3000? 9 1500 2000 2000 9 ? ? not know yet 7,5 650* 750*
14 2500 2500 2500 30,0 3500 8,0 900 32 5400 12GHz? 5000 14 ~3500? 32 (not yet) (no value) (no value) 14 ? ? not know yet 28,5 2000* 1900*
10,0 1200 Antenna Antenna Antenna Antenna
Antenna Antenna Date ready now now Date ready Now.  Date ready now now now Date ready now now Antenna
Date ready now now 2015/09 Date ready now now Optics ring focus ring focus Optics Cassegrain. Optics ring focus ring focus ring focus Optics ring-focus ring-focus Date ready now now
Optics prime cass cass Optics ring focus ring focus Az slew rate (°/s) 12 12 Az slew rate (°/s) 300 d/min Az slew rate (°/s) 12 12 12 Az slew rate (°/s) 720 deg/min 720 deg/min Optics ring focus ring focus
Az slew rate (°/s) 3 5 12 Az slew rate (°/s) 12 12 El slew rate (°/s) 6 6 El slew rate (°/s) 75 d/min El slew rate (°/s) 6 6 6 El slew rate (°/s) 360 deg/min 360 deg/min Az slew rate (°/s) 12 12
El slew rate (°/s) 1 1,25 6 El slew rate (°/s) 6 6 Diameter (m) 13,2 13,2 Diameter (m) 12 Diameter (m) 13,2 13,2 13,2 Diameter (m) 13,20 13,20 El slew rate (°/s) 6 6
Diameter (m) 18 12,1 12,1 Diameter (m) 13,2 13,2 efficiency (%) efficiency (%) efficiency (%) efficiency (%) Diameter (m) 13,2 13,2
efficiency (%) efficiency (%) 2 70 3GHz? 2 50%? 2 70 (not yet) (not yet) 2 ? ? not know yet efficiency (%)
2 40 50 50 2,3 65 4,0 55 9 70 8GHz? 5 60%? 9 70 (not yet) (not yet) 5 ? ? not know yet 2,4 70* 70*
5 40 50 50 8,5 80 6,0 65 32 38 12GHz? 9 60%? 32 (not yet) (not yet) (not yet) 9 ? ? not know yet 7,5 80* 80*
9 40 50 50 32,0 64 8,0 65 14 50%? 14 ? ? not know yet 28,5 75* 75*
14 40 50 50 10,0 60
Front End Front End Front End Front End Front End Front End Front End
Date ready now now 2016/01 Date ready now   now Date ready not available now   Date ready Mid-2017 Date ready now now now Date ready summer 2017 summer 2017 Date ready now now
Tsys (K)       Tsys (K)       Tsys (K)       Tsys (K)   Tsys (K)       Tsys (K)     Tsys (K)    
2 50 50 50 2,3 40 4,0 34 2 50 3GHz?   2 90K? 2 49 (not yet) (not yet) 2 ? ? not know yet 2,4 35* 40*
5 50 50 50 8,5 35 6,0 31 9 50 8GHz?   5 80K? 9 52 (not yet) (not yet) 5 ? ? not know yet 7,5 25* 30*
9 50 50 50 32,0 100 8,0 27 32 100 12GHz?   9 80K? 32 (not yet) (not yet) (not yet) 9 ? ? not know yet 28,5 75* 70*
14 50 50 50     10,0 30 Band1 14 90K? Band1       14 ? ? not know yet      
Band1 Band1 Name S-band Broad-band   Band1   Name S-band Broadband Broadband Band1     Band1    
Name broadband broadband broadband Name S-band   band Start freq (GHz) 2,2 2   Name broadband Start freq (GHz) 2,2 3 3 Name broadband broadband Name S-band S-band
Start freq (GHz) 2,2 2,2 2,2 Start freq (GHz) 2   1 Stop freq (GHz) 2,7 14   Start freq (GHz) 2,2 Stop freq (GHz) 2,4 14 14 Start freq (GHz) 3 2,2 Start freq (GHz) 2,2 2,2
Stop freq (GHz) 14 14 14 Stop freq (GHz) 2,8   14 npol 2 2   Stop freq (GHz) 14 npol 1 2 2 Stop freq (GHz) 15 14 Stop freq (GHz) 2,6 2,6
npol 2 2 2 npol 2   2 pol type circular linear   npol 2 pol type circular linear linear npol 2 2 npol 2 2
pol type linear linear linear pol type circular   linear Band2   pol type Linear Band2     pol type linear linear pol type circular circular
Band2   Name X-band Name X-band   Band2    
Name X-band Start freq (GHz) 7 Start freq (GHz) 8,18   Name X-band X-band
Start freq (GHz) 7 Stop freq (GHz) 9,5 Stop freq (GHz) 8,98   Start freq (GHz) 7 7
Stop freq (GHz) 9,5 npol 2 npol 1   Stop freq (GHz) 9,5 9,5
npol 2 pol type circular pol type circular   npol 2 2
pol type circular Band3   Band3     pol type circular circular
Band3   Name Ka-band Name Ka-band   Band3    
Name Ka-band Start freq (GHz) 28 Start freq (GHz)     Name Ka-band Ka-band
Start freq (GHz) 28 Stop freq (GHz) 32 Stop freq (GHz)     Start freq (GHz) 28 28
Stop freq (GHz) 33 npol 2 npol     Stop freq (GHz) 34 34
npol 2 pol type circular pol type circular   npol 2 2
pol type circular pol type circular circular
PCAL PCAL PCAL PCAL PCAL PCAL PCAL
Date ready now now 2016/01 Date ready March 15   June 16 Date ready now now Date ready now Date ready now now Date ready now now Date ready now now
injection pre LNA pre LNA pre LNA injection pre LNA   post LNA injection pre LNA pre LNA injection Injected from probe in feed injection pre LNA pre LNA injection launch into feed launch into feed injection pre LNA pre LNA
generator Mk3 digital digital generator Wettzell   Wettzell generator Yebes Yebes generator Callisto design. generator AES AES generator CDMS Haystack CDMS Haystack generator IAA design IAA design
freq spacing (MHz) 5 5 5 freq spacing (MHz) 1;5;10   5 freq spacing (MHz) 1 5 freq spacing (MHz) 5 freq spacing (MHz) 5 5 freq spacing (MHz) 1 1 freq spacing (MHz) 1; 2 1; 2
Noise Diode Noise Diode
Date ready now now 2015/09 Date ready March 15   August 17 Noise Diode     Noise Diode Noise Diode Noise Diode Noise Diode
installed yes yes yes installed now   no Date ready now now date ready Now Date ready now (not yet) date ready now now Date ready now now
synchronous (Hz) 10-100 10-100 10-100 synchronous (Hz) on/off/80 Hz   na installed yes yes    installed   installed yes (not yet) synchronous (Hz) 80 80 installed yes yes
Cable Cal Cable Cal synchronous (Hz) 80 Hz 80 Hz synchronous (Hz)   synchronous (Hz) (No Func)   synchronous (Hz) on/off on/off
Date ready 2015/03 2015/03 2016/01 Date ready autumn 15   Oct. 2017 Cable Cal Cable Cal Cable Cal Cable Cal Cable Cal
Type new new new Type own design   new design Date ready now now Date ready N/A Date ready now now Date ready now now Date ready now now
Down-converter Down-converter Type Mk3   Type N/A Type NICT NICT Type radio-optical radio-optical Type IAA design IAA design
Date ready now now 2016/01 Date ready now   now Down-converter Down-converter   Down-converter     Down-converter     Down-converter    
Band 1       Band 1       Date ready now now Date ready Now Date ready now now now Date ready now now Date ready now now
Type up-down up-down up-down Type down   down Band 1     Sub-band 1   Band 1       Sub-band 1     Band 1    
nband 4x2 4x2 4x2 nband 2   2 Type fixed down   Type Fixed Type fixed down flexible up-down direct sampling Type quasi-fixed down quasi-fixed down Type down down
1st stage 1st stage 1st stage nband 2 nband 2 nband 1 4 nband 2 2 nband 2 2
filter start (GHz)  na na na filter start (GHz) 2,1 filter start (GHz) 2,8 1st stage 1st stage 1st stage 1st stage 1st stage
filter stop (GHz) na na na filter stop (GHz) 2,7 filter stop (GHz) 4 filter start (GHz) 2,2 filter start (GHz) ~3  filter start (GHz) 2,2 27,928 filter start (GHz) filter start (GHz) 2,2 2,2
lo start (GHz) 23 23 23 lo start (GHz) 1,5 lo start (GHz) 1 filter stop (GHz) 2,7 filter stop (GHz) 7 filter stop (GHz) 2,4 29,928 filter stop (GHz) filter stop (GHz) 2,6 2,6
lo stop (GHz) 33 33 33 lo stop (GHz) 3 lo stop (GHz) 6 lo start (GHz) 1,7 lo start (GHz) 4,1 lo start (GHz) 2,02 15,44 lo start (GHz) 4.100 4.100 lo start (GHz) 3,6 3,6
lo res (KHz) 400 400 400 lo res (KHz) 0,001 lo res (KHz) 0,001 lo stop (GHz) na lo stop (GHz) 13,4 lo stop (GHz) na 26,416 lo stop (GHz) 13.400 13.400 lo stop (GHz) 3,7 3,7
2nd stage Nyquist Nyquist lo res (KHz) fixed lo res (KHz) 100 lo res (KHz) fixed 100 lo res (KHz) 100 100 lo res (KHz) 100 100
filter start (GHz) 20 20 19 Start (MHz) 0 Start (MHz) 0 Nyquist Nyquist Nyquist Nyquist Nyquist
filter stop (GHz) 22 22 21 Stop (MHz) 512 Stop (MHz) 1536 Start (MHz) 500 Start (MHz) 0 Start (MHz) 0 0 Start (MHz) 0 0 Start (MHz) 1024 1024
lo start (GHz) 22,5 22,5 22 Net range Net range Stop (MHz) 1000 Stop (MHz) 4096 Stop (MHz) 500 1024 Stop (MHz) 4096 4096 Stop (MHz) 1536 1536
lo stop (GHz) na na 23 Start (GHz) 2 Start (GHz) 3 Net range Net range Net range Net range Net range
lo res (KHz) fixed fixed 200 Stop (GHz) 3 Stop (GHz) 4 Start (GHz) 2,2 Start (GHz) 3 Start (GHz) 2,2 3 Start (GHz) 0 0 Start (GHz) 2,2 2,2
3rd stage Band 2 1. Converter     Stop (GHz) 2,7 Stop (GHz) 7 Stop (GHz) 2,4 14 Stop (GHz) 15.0 15.0 Stop (GHz) 2,6 2,6
filter start (GHz) na na 2 Type up-down   down Type up-down up-down Sub-band 2   Band 2   Sub-band 2     Band 2 1. Converter 1. Converter 2. Converter 3.Converter
filter stop (GHz) na na 3 nband 2     nband 2 4 Type Fixed Type fixed down Type quasi-fixed down U|L quasi-fixed down U|L Type up-down up-down up-down up-down
lo start (GHz) na na 1,9 1st stage 1st stage 1st stage nband 2 nband 1 nband 2 2 nband 2 2 2 2
lo stop (GHz) na na 2,1 filter start (GHz) 7 filter start (GHz) 4,6 filter start (GHz) 7 2 1st stage 1st stage 1st stage 1st stage
lo res (KHz) na na 0,001 filter stop (GHz) 9,5 filter stop (GHz) 6,6 filter stop (GHz) 9,5 14 filter start (GHz) 6 filter start (GHz) 8,18 filter start (GHz) filter start (GHz) 7 7 7 7
Nyquist LO start (GHz) 11 LO start (GHz) 1 LO start (GHz) 10 24,25 filter stop (GHz) 10 filter stop (GHz) 8,592 filter stop (GHz) filter stop (GHz) 9,5 9,5 9,5 9,5
Start (MHz) 512 512 512 LO stop (GHz) 13,4 LO stop (GHz) 6 LO stop (GHz) 13 34,75 lo start (GHz) 4,1 LO start (GHz) 8,08 lo start (GHz) 4.100 4.100 LO start (GHz) 24 23,5 23,5 23,5
Stop (MHz) 1024 1024 1024 lo res (KHz) 0,001 lo res (KHz) LO res mHz 400KHz lo stop (GHz) 13,4 LO stop (GHz) na lo stop (GHz) 13.400 13.400 LO stop (GHz) 25,5 25,5 25,5 25,5
Net range 2nd stage 2nd stage 0,001 2nd stage lo res (KHz) 100 LO res fixed lo res (KHz) 100 100 lo res (KHz) 400 400 400 400
Start (GHz) 1 1 2 filter start (GHz) 20 filter start (GHz) filter start (GHz) 19,35 19,75 Nyquist Nyquist Nyquist 2nd stage
Stop (GHz) 11,5 11,5 13,5 filter stop (GHz) 22 filter stop (GHz) filter stop (GHz) 20,25 22,25 Start (MHz) 0 Start (MHz) 100 Start (MHz) 0 0 filter start (GHz) 16 16 16 16
LO start (GHz) 19,5 LO start (GHz) LO start (GHz) 19,25 22,25 Stop (MHz) 4096 Stop (MHz) 512 Stop (MHz) 4096 4096 filter stop (GHz) 17 17 17 17
LO stop (GHz) na LO stop (GHz) LO stop (GHz) na 22,25 Net range Net range Net range LO start (GHz) 15 15 15 15
LO res fixed LO res LO res fixed fixed Start (GHz) 6 Start (GHz) 8,18 Start (GHz) 0 0 LO stop (GHz) na na na na
Nyquist Nyquist Nyquist Stop (GHz) 10 Stop (GHz) 8,592 Stop (GHz) 15.0 15.0 LO res fixed fixed fixed fixed
Start (MHz) 512 Start (MHz) 0 Start (MHz) 100 DC Sub-band 3   Band3   Sub-band 3     Nyquist
Stop (MHz) 2560 Stop (MHz) 1536 Stop (MHz) 1000 1000 Type Fixed Type fixed down Type quasi-fixed down U|L quasi-fixed down U|L Start (MHz) 1024 1024 1024 1024
Net range Net range Net range nband 2 nband 1 nband 2 2 Stop (MHz) 2048 2048 2048 2048
Start (GHz) 7 Start (GHz) 4,7 Start (GHz) 7 1st stage 1st stage 1st stage Net range
Stop (GHz) 9,5 Stop (GHz) 6,5 Stop (GHz) 9,5 filter start (GHz) 9,5 filter start (GHz) 8,592 filter start (GHz) Start (GHz) 7 7 7 7
Band3   Band3   Band 4 Band3 filter stop (GHz) 13,5 filter stop (GHz) 8,98 filter stop (GHz) Stop (GHz) 9,5 9,5 9,5 9,5
Type down-down   down down Type down-down lo start (GHz) 4,1 LO start (GHz) 8,08 lo start (GHz) 4.100 4.100 Band 3 1. Converter 1. Converter 2. Converter 3.Converter
nband 2       nband 2 lo stop (GHz) 13,4 LO stop (GHz) na lo stop (GHz) 13.400 13.400 Type down-down down-down down-down down-down
1st stage 1st stage 1st stage lo res (KHz) 100 LO res fixed lo res (KHz) 100 100 nband 2 2 2 2
filter start (GHz) 27 filter start (GHz) 5,75 10 filter start (GHz) 28 Nyquist Nyquist Nyquist 1st stage
filter stop (GHz) 33 filter stop (GHz) 8,25 12,5 filter stop (GHz) 33 Start (MHz) 0 Start (MHz) 512 Start (MHz) 0 0 filter start (GHz) 28 28 28 28
LO start (GHz) 16,5 LO start (GHz) 1 9 LO start (GHz) 15 Stop (MHz) 4096 Stop (MHz) 1000 Stop (MHz) 4096 4096 filter stop (GHz) 34 34 34 34
LO stop (GHz) 22,5 LO stop (GHz) 6 12 LO stop (GHz) 20 Net range Net range Net range LO start (GHz) 17,5 21,5 21,5 21,5
lo res (KHz) 0,001 lo res (KHz) 0,001 0,001 LO res mHz Start (GHz) 9,5 Start (GHz) 8,592 Start (GHz) 0 0 LO stop (GHz) 22,5 27 27 27
2nd stage 2nd stage 2nd stage Stop (GHz) 13,5 Stop (GHz) 8,98 Stop (GHz) 15.0 15.0 lo res (KHz) 400 400 400 400
filter start (GHz) 10,25 filter start (GHz) filter start (GHz) 12,75 Sub-band 4 2nd stage
filter stop (GHz) 12,25 filter stop (GHz) filter stop (GHz) 13,25 Type quasi-fixed down U|L quasi-fixed down U|L filter start (GHz) 10,5 6,5 6,5 6,5
LO start (GHz) 9,75 LO start (GHz) LO start (GHz) 12,25 nband 2 2 filter stop (GHz) 11,5 7,5 7,5 7,5
LO stop (GHz) na LO stop (GHz) LO stop (GHz) na 1st stage LO start (GHz) 12,5 5,5 5,5 5,5
LO res fixed LO res LO res fixed filter start (GHz) LO stop (GHz) na na na na
Nyquist Nyquist Nyquist filter stop (GHz) LO res fixed fixed fixed fixed
Start (MHz) 512 Start (MHz) 0 0 Start (MHz) 500 lo start (GHz) 4.100 4.100 Nyquist
Stop (MHz) 2560 Stop (MHz) 1536 1536 Stop (MHz) 1000 lo stop (GHz) 13.400 13.400 Start (MHz) 1024 1024 1024 1024
Net range Net range Net range lo res (KHz) 100 100 Stop (MHz) 2048 2048 2048 2048
Start (GHz) 27 Start (GHz) 6 10 Start (GHz) 28 Nyquist Net range
Stop (GHz) 33 Stop (GHz) 7,5 12,5 Stop (GHz) 33 Start (MHz) 0 0 Start (GHz) 28 28 28 28
Stop (MHz) 4096 4096 Stop (GHz) 34 34 34 34
Net range
Start (GHz) 0 0
Stop (GHz) 15.0 15.0
Sampler Sampler Sampler Sampler Sampler Sampler     Sampler    
Date ready now now 2016/01 Date ready now   now Date ready now Date ready now Date ready now now now Date ready now now Date ready now now
Input bandwidth (MHz) 512 512 512 Type DBBC   DBBC Type ADB Input bandwidth (MHz) 4096 Type ADS3000+ ADS3000+ K6 Type ADB3L ADB3L      
Nyquist zone 2 2 2 Input bandwidth (MHz) 512 Input bandwidth (MHz) 512 Input bandwidth (MHz) 500/1000 Nyquist zone 1 Input bandwidth (MHz) 512 512 16384 Input bandwidth (MHz) 4096 4096 Input bandwidth (MHz) 512 512
Sample clock (MHz) 1024 1024 1024 Nyquist zone 4 Nyquist zone 4 Nyquist zone 2 Sample clock (MHz) 8192 Nyquist zone 1or2  3or4 2 Nyquist zone 1 1 Nyquist zone 3 3
bits/sample 8 8 8 Sample clock (MHz) 1024 Sample clock (MHz) 1024 Sample clock (MHz) 1024 bits/sample 10 Sample clock (MHz) 2048 2048 16384 Sample clock (MHz) 8192 8192 Sample clock (MHz) 1024 1024
Total No. of IF's 4x2 4x2 4x2 bits/sample 8 bits/sample 8 bits/sample 8 Total No. of IF's 3x2 bits/sample 8 8 3 bits/sample 10 10 bits/sample 8 8
Total No. of IF's 4   4 Total No. of IF's 2 Total No. of IF's 4 4 2(nominal), 4(extended ) Total No. of IF's 4x2 4x2 Total No. of IF's 8 8
Digital Back End (DBE) Digital Back End (DBE) Digital Back End (DBE) Digital Back End (DBE) Digital Back End (DBE) Digital Back End (DBE) Digital Back End (DBE)
Type RDBE RDBE RDBE Type DBBC   DBBC ADS3000+ Type RDBE-G Type DBBC3-6L6H Type ADS3000+ ADS3000+ GALAS(OCTAD-G) Type DBBC3-L DBBC3-L Type BRAS BRAS
No. DBE per site 4 4 4 No. DBE per site 2   2 2 No. DBE per site 4 No. DBE per site 1 No. DBE per site 1 4   No. DBE per site 1 1 No. DBE per site 1 1
No. IF's per DBE 2 2 2 No. IF's per DBE 4   4 4 No. IF's per DBE 2 No. IF's per DBE 6 No. IF's per DBE 4 4   No. IF's per DBE 8 8 No. IF's per DBE 8 8
DDC na na na DDC         DDC   DSC (phase 1)   DDC       DSC (phase 1)     DDC na na
PFB       No. per DBE 16   16 4 No. per DBE 4 No. per DBE 6 No. per DBE 16 16 4(nominal),8(extended) No. per DBE 8 8 PFB na na
No. per DBE 2 2 2 Chan BW (MHz) 1 to 16   1 to 16 1 to 16 Chan BW (MHz) 1,2,4,8,16,32,64,128 Chan BW (MHz) 4096 Chan BW (MHz) 4 to 32 4 to 32 1024 Chan BW (MHz) 4096 4096 No. per DBE    
Chan BW (MHz) 32 32 32 Sideband UL   UL UL Sideband UL Sideband U|L Sideband UorL UorL   Sideband U|L U|L Chan BW (MHz)    
Chan per DBE 16 16 16 LO Res (KHz) 10   10 10 LO Res (KHz) 15625 LO Res (KHz) na LO Res (KHz) 0,001 0,001 1 LO Res (KHz) na na Chan per DBE    
PFB         PFB     DDC-OCT (phase 2)   PFB         DDC-OCT (phase 2)    
No. per DBE 4   4 4 No. per DBE   No. per DBE >=6 No. per DBE (No func) (No func)   No. per DBE >=8 >=8
Chan BW (MHz) 32   32 32 Chan BW (MHz) 32 Chan BW 2048, 1024 Chan BW (MHz) (No func) (No func)   Chan BW 2048, 1024 2048, 1024
Chan per DBE 30   30 16 Chan per DBE 32 Sideband U|L Chan per DBE (No func) (No func)   Sideband U|L U|L
LO Res (KHz) 1000 LO Res (KHz) 1000 1000
DDC (phase 2)   DDC (phase 2)    
No. per DBE 6*8 No. per DBE 8*8 8*8
Chan BW 2-128 Chan BW 2-128 2-128
Sideband U&L Sideband U&L U&L
LO Res (KHz) 10 LO Res (KHz) 10 10
PFB (phase 3)   PFB (phase 3)    
No. per DBE 6 No. per DBE 8 8
Chan BW (MHz) 256 Chan BW (MHz) 256 256
Chan per DBE 8*16 (15+1) Chan per DBE 8*16 (15+1) 8*16 (15+1)
  DDC/PFB | FPB/DDC (phase 3)     DDC/PFB | FPB/DDC (phase 3)    
No. per DBE > 6*2 No. per DBE > 8*2 > 8*2
Chan BW 2-128 Chan BW 2-128 2-128
Sideband U&L Sideband U&L U&L
LO Res (KHz) variable LO Res (KHz) variable variable
Recorder Recorder Recorder Recorder Recorder Recorder Recorder
Type Mk6 Mk6 Mk6 Type Mk5B+   Mark5 Mark6 Type Mark6 Type Flexbuff Type K5VSI K5VSI Type FILA40G/Flexbuff FILA40G/Flexbuff Type DRS / Mk5C(under repair)     DRS / Mk5C
No. per site 1 1 2 No. per site 2   2 1 No. per site 2 No. per site 1 No. per site 2 4 No. per site 1 1 No. per site 1 / 1       1 / 1
Network Network Network Network Network Network     Network
Data rate (Gbps) 20 1 0,1 Data rate (Gbps) 1 1 Data rate (Gbps) 10 Data rate (Gbps) 10 Data rate (Gbps) 10 10 Data rate (Gbps) 10 10 Data rate (Gbps) 2 2