H0EL-EthMux V2 V0 White Paper (TDM over IP)
Contents
1. 3 DATA El 3 El 4 El 4 UPLINK UPL INK 3 Note 3 1 Mode switch setting With 16 positions numbered through F users may store up to 16 sets of different parameter combinations based on their various application requirements But strongly suggested 8 groups of paired setting 1 e mode 0 and mode define a communication pair as well as 2 3 4 5 E F The even odd are paired 1 even odd A 16 position rotary Mode Switch is provided on the rear panel of HOEL EthMux V2 It is used for quick selection of pre saved parameter settings For HOEL EthMux V2 after the Mode Switch 1s set to a position between 0 and F with screwdriver please connect the console port on HOEL EthMux to a PC running hyper terminal withdMOEL Et hMux RS232 cable and check through console commands For HOEL EthMux VO using console commands in the field 6 CHANGE MODE to setting mode The new mode taked effect need several seconds after qiut menu of 6 CHANGE MODE for software V0 0 4 For software V0 0 5 or highgpe EthMux new mode taked effect just need afform in menu of 6 CHANGE MODE The new mode can check through console commands 3 2 El ports There are 2 sets of E1 ports on the rear panel Each E1 port has a pair of BNC connectors and a RJ45 socket The left port is denoted port A and the other port B The E1 interface impedance is 75 2 BNC or 120 Q RJ45 adaptive depending on the cables installed Make sure that both types of cables are2. NOT connected at the same time When only use one E1 please only link port A and do not link port B in out HOEL EthMux will auto assign bandwidth for the second E1 when linking E1 port B in and out with loop cable which will inferior local LAN traffic or port A E1 performance HOEL EthMux V2 VO White Paper TDM over IP 3 5 Beijing Huahuan Electronics Co Ltd Huahuan So please let no use E1 port B in and out link null 3 3 Control the loop back of E1 ports A 2 dip switch is provided on the front panel to control the loop back of E1 ports Either local LLop or remote RLop loop back can be set by this switch Command from the remote has a higher priority So if RLop dip is pressed down on the remote box the local dip position of LLop will not take effect One cannot let the system to perform both LLop and RLop at the same time Instead if both dips are pressed down for more than 20 seconds the device will reset all user definable parameters to default settings The LLop and RLop dip switches will be helpful for installation test 3 4 Comeback default settings The LLop and RLop dip switches both pressed down for more than 30 seconds the device will reset all user definable parameters to default settings Then the dip switches both pressed up the default settings become effective Pay attention to the 16 position rotary Mode Switch setting on the rear panel of HOEL EthMux V2 3 5 Save current setting Current setting of pack
3. operations In most cases setting both units to through timing mode is sufficient But sometimes setting one unit to loop timing mode may work better For example setting the HOEL EthMux unit connected with the clock master such as local exchange master station etc to loop mode and the other unit connected with the clock slave such as PBX or remote module slave station etc to through mode is probably better than setting both to through modes Note setting the HOEL EthMux unit connected with the clock slave to through mode is important for link synchronization 2 4 Bandwidth of uplink packet Bigger El packet sizes need more bandwidth of uplink packet for HOEL EthMux Example show as follow E1 packet size as 1x128 6x128 and 11x128 Packet size Bandwidth 1 X 128Bytes 6 X 128Bytes 11 X 128Byte No El link 1 03M 0 17M 0 09M Use IP header for 2 85M 2 19M 2 19M X E1 data packets No IP header for 2 40M 2 11M 2 08M 1 X El data packets Use IP header for 5 70M 4 37M 4 28M e a No IP header for 4 80M 4 22M 4 16M axerdmapaoes y M HOEL EthMux V2 VO White Paper TDM over IP 2 5 Beijing Huahuan Electronics Co Ltd Huahuan 2 5 Support cascade concatenate for more than two E1 ports HOEL EthMux support cascade concatenate for more than 2 E1 ports when wireless LAN bridges have enough bandwidth Show as follow Wireless LAN bridge Wireless LAN bridge El 2 UPLINK El 2 El
4. 28 byte then Y n 2 ms Z Jitter Buffer Size delay The m Jitter Buffer Size 1 80 Z m 2 ms Then Time delay X Y Z 1 5 n 2 m 2 ms For example mode switch setting is 2 3 mode packet size is 3x128 byte n 3 HOEL EthMux V2 VO White Paper TDM over IP 1 5 Beijing Huahuan Electronics Co Ltd Huahuan Jitter Buffer Size is 30 m 30 so Time delay 1 5 3 2 30 2 18 ms Mode switch setting is 4 5 mode packet size is 11X128 byte n 11 Jitter Buffer Size is 30 m 30 so Time delay 1 5 11 2 30 2 22 ms If uplink connection uses wireless LAN bridges the time delay of E1 link unilateralism need add delay of wireless LAN bridges link Optimized Jitter Buffer Size is important for TDM over IP link Increase Jitter Buffer Size will be better to resist packet delay variation PDV of LAN bridge but increase the time delay of E1 link Decrease Jitter Buffer Size will decrease the time delay of El link but be worse to resist packet delay variation PDV Shortage of jitter buffer to resist packet delay variation PDV of LAN bridge will cause E1 error bits More time delay of E1 link will cause low quality of E1 2 3 Timing mode setting There are two types of timing mode through and loop Both units of HOEL EthMux are setting to through timing mode works well for all the conditions although the other option may work better So default timing mode through is suggested Correct timing mode setting is important for smooth
5. Beijing Huahuan Electronics Co Ltd Huahuan HOEL EthMux V2 VO White Paper TDM over IP 1 Brief Introduction This white paper is help supported for user manual of HOEL EthMux V2 and VO and given useful information for installation There are two local 10 100BaseT auto sensed Ethernet ports for HOEL EthMux V2 which differ from HOEL EthMux VO This white paper will focus on HOEL EthMux V2 and HOEL EthMux V0 HOEL EthMux V4 supports 4E1 T1s web server configuration and point to multipoint application HOEL EthMux V4 white paper will be separately released Table of Models HOEL EthMux V2 l uplink 2E1s 2 User Data Ports Model HOEL EthMux VO l uplink 2E1s HOEL EthMux V4 2 uplinks 4E1 T1s 2 User Data Ports 2 Operation 2 1 Recommend mode switch setting There are 8 groups of paired setting 1 e mode 0 and mode define a communication pair as well as 2 3 4 5 E F The even odd are paired 1 even odd Recommend mode switch setting is 2 3 mode one side HOEL EthMux is mode 2 another is mode 3 Please refer to section 5 interoperability with wireless LAN bridges 2 2 Rough estimate of time delay Here is rough estimate of time delay not included wireless LAN bridges link Elin pm UPLINK El out fr aera RJ 45 Cable HOEL EthMux Ael Delay Measurement The time delay of E1 link unilateralism rough estimated as follow Time delay X Y Z X Fixup delay about 1 5ms Y Packet delay If packet size is nX 1
6. et size timming mode or jitter buffer size be affirmed in menu of 5 SAVE CONFIG through console commands HOEL EthMux need take several minutes auto gradually to reach the value of jitter buffer 3 6 Grounding Grounding screw used to connect the chassis to the protective ground Please credibly connect ground screw of HOEL EthMux to the room protective ground also other equipment that link with HOEL EthMux for prevent interfere and damaged interface 3 7 Avoid lightning strikes When connecting to a wireless LAN bridge the uplink Ethernet cable often connects to the outdoor unit posing danger to lightning strikes that can seriously damage the equipment To protect the equipment as well as people surge protection devices with good earth connection is strongly recommended Poor earth connection may also hinder the operation of the Ethernet port causing severe packet losses 4 Common faults and support When HOEL EthMux cooperated with many wireless bridges E1 channel links but has error Suggest as follows a Packet loss indicator red LED PKTLOS Blinks Please check bandwidth of Wireless bridge Maybe wireless link bandwidth is not enough HOEL EthMux V2 VO White Paper TDM over IP 4 5 Beijing Huahuan Electronics Co Ltd Huahuan b Packet loss indicator red LED PKTLOS is OFF and red LED ETHErr of packet communication status is OFF Please set more jitter buffer of HOEL EthMux to resist packet de
7. lay variation of wireless bridge link 5 Interoperability with Wireless Bridges HOEL EthMux has cooperated with many Wireless bridges show as follow More HOEL EthMux V2 amp VO mode switch setting Q MOTOROLA MOTOROLA USA CANOPY Mode 2 3 intelligence everywhere gt 700BH Mode 4 5 also 5700BH20 BH45 ai etc CANOPY Alvarion Israel BREEZENET Mode 4 5 DS 11 alvarion 28B LBetc Proxim USA Tsunami Mode 2 3 Jitter pro gt lt im MP 11a series Buffer 80 QuickBridge20 Mode 6 7 Mode 2 3 QB20 etc also but more delay wireless bridges are supported Interoperability Table Wireless Bridges Ay Wi Comm United Canada Ultima 3 series Mode 6 7 Mode NKU 2 3 4 5 8 9 also Libra 5800 series Orthogon Systems UK OS Gemini 58xx Mode 2 3 Jitter othogon l Roots ingore 7 SN Buffer 40 Communications Systems Nanjing Z Com China Air Access Mode 2 3 wireless company ZX 5800 Mode 4 5 also ZA 5000 etc Infinet Wireless RWR 5000mini a Note More wireless bridges are supported HOEL EthMux V2 VO White Paper TDM over IP 5 5
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