# HL6528RD network registration issues **URL:** \ **Category:** Legacy HL Series\ **Created:** [October 16, 2019, 3:19pm UTC](https://forum.sierrawireless.com/t/hl6528rd-network-registration-issues/17967 "2019-10-16T15:19:37Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![hestia](https://avatars.discourse-cdn.com/v4/letter/h/6bbea6/32.png) [@hestia](https://forum.sierrawireless.com/u/hestia)\ **Post date:** [October 16, 2019, 3:19pm UTC](https://forum.sierrawireless.com/t/hl6528rd-network-registration-issues/17967/1 "2019-10-16T15:19:37Z")
Hello everyone, I’ve been working for years with HiloNcV2 and later with HL6528RD. According to my experience, HiloNcV2 modems are not as good as any standard phone regarding connectivity (even with a good external antenna!). For instance, I often face the case where old phone (eg. Nokia 3210) is able to attach/register a network quickly and with a good signal while HiloNcV2 either never connect or after a longer time. Obviously with same SIM card and at the same location. Unfortunately, with HL6528RD it is even worse! Here is my last case: I have one HiloNcV2 and one HL6528 RD with the same kind of external antenna both at the same location and both with the same operator SIM card (french operator Free). The HiloNcV2 is able to attach an authorised roaming network quite easily with a good signal : > 2019-10-11 06:44:46,16,7,V4:, …/trunk/serveurModem/outils/cmdAT.c(20956)read\_from\_modem()L172: RECV[0]:OK > 2019-10-11 06:45:01,16,7,V4:, …/trunk/serveurModem/outils/cmdAT.c(20956)sendATcmd()L224: send[0]:AT+CSQ#015 > 2019-10-11 06:45:01,16,7,V4:, …/trunk/serveurModem/outils/cmdAT.c(20956)read\_from\_modem()L172: RECV[0]:+CSQ: 21,99 > 2019-10-11 06:45:01,16,7,V4:, …/trunk/serveurModem/outils/cmdAT.c(20956)read\_from\_modem()L172: RECV[0]:OK > 2019-10-11 06:45:01,16,7,V4:, …/trunk/serveurModem/outils/cmdAT.c(20956)sendATcmd()L224: send[0]:AT\*PSNTRG?#015 > 2019-10-11 06:45:01,16,7,V4:, …/trunk/serveurModem/outils/cmdAT.c(20956)read\_from\_modem()L172: RECV[0]:\*PSNTRG: 5,1,“208”,“01”,“6901”,“2A9B”,“Orange F”,1,0 > 2019-10-11 06:45:01,16,7,V4:, …/trunk/serveurModem/outils/cmdAT.c(20956)read\_from\_modem()L172: RECV[0]:OK On the contrary, the HL6528RD is able to attach this authorised roaming network only a few time and with a poorer signal. Most of the time it attaches a forbidden roaming network with an even worse signal (I can say that because the Hilo sometimes also attachs this forbidden roaming network that has a poorer signal): > 2019-10-11 06:45:09,1,7,V4:, …/trunk/serveurModem/outils/cmdAT.c(20956)sendATcmd()L224: send[0]:AT+CSQ#015 > 2019-10-11 06:45:09,1,7,V4:, …/trunk/serveurModem/outils/cmdAT.c(20956)read\_from\_modem()L172: RECV[0]:+CSQ: 6,99 > 2019-10-11 06:45:09,1,7,V4:, …/trunk/serveurModem/outils/cmdAT.c(20956)read\_from\_modem()L172: RECV[0]:OK > 2019-10-11 06:45:09,1,7,V4:, …/trunk/serveurModem/outils/cmdAT.c(20956)sendATcmd()L224: send[0]:AT\*PSNTRG?#015 > 2019-10-11 06:45:09,1,7,V4:, …/trunk/serveurModem/outils/cmdAT.c(20956)read\_from\_modem()L172: RECV[0]:\*PSNTRG: 6,2,“208”,“20”,“55F4”,“4E9D”,“F-Bouygues Telecom”,1,0,0 > 2019-10-11 06:45:09,1,7,V4:, …/trunk/serveurModem/outils/cmdAT.c(20956)read\_from\_modem()L172: RECV[0]:OK I tried to change switch SIM card and external antennas and the behavior is always the same. Both Hilo and HL are in automatic attach mode: > AT+COPS=0 I don’t know what I should do to make HL and Hilo register/attach better. Is it a good idea to try manual mode, given that my customers and I are not expert in GSM/GPRS network?? It is also worth mentioning that I experienced strange registration issue with Hilo already : > [@Hilonc V2 - Network Registration](https://forum.sierrawireless.com/t/hilonc-v2-network-registration/7445/4): > > Hi, I also have troubles with Hilonc V2 /HL6528RD network registration (for GSM). I have at least a hundred Hilonc V2 in the field. According to my experience, when modem is set once with AT+COPS=0 (default settings). The modem is automatically re registering when it can. No need to reset. However, on one site, with a Orange business card, I have the following issue: It has been working like a charm for several month and then, one day, the modem has been unregistered. Even if the signal is … I also never had answer to my questions in those posts : > [@Why the device cannot register with the operator](https://forum.sierrawireless.com/t/why-the-device-cannot-register-with-the-operator/7185/12): > > Hello sambk87 For my case, the problem appears in a city center fully covered by tower cells of the operator. So YES I think it’s a hardware problem. You can enable this unsolicited response as the others like +WIND, +CREG, +CGREG, … without any problem. You mean i should reset modem by AT+CFUN=1 command? I did but that did not work. Note that my modems are deployed on real sites. Could you share some ways of working around? I mean that a simple reset by AT+CFUN=1 is not always sufficie… > [@Network Scan - Get Network Environment Quality](https://forum.sierrawireless.com/t/network-scan-get-network-environment-quality/5736/7): > > I suppose the AT+NWKSCAN equivalent for HL series embedded devices is KNETSCAN. Am I right? Is HL6528RD worse than Hilo? Should we switch to an other HL model? Thanks in advance for your answers ---
**Author:** ![hestia](https://avatars.discourse-cdn.com/v4/letter/h/6bbea6/32.png) [@hestia](https://forum.sierrawireless.com/u/hestia)\ **Post date:** [October 17, 2019, 7:37am UTC](https://forum.sierrawireless.com/t/hl6528rd-network-registration-issues/17967/2 "2019-10-17T07:37:05Z")
Yesterday, I removed the HL652RD 1.8V from its socket and I have seen that some pins of the socket seem to have verdigris on the following pins : 49, 51 and 55. I put a HL6528RD 2.8V in the socket and then the HL6528RD 1.8V back in the socket. I unplugged our controler for the night and this morning HL6528RD is attached to the authorized roaming network correctly and with a very good signal. I suppose that there was verdegris adding impedance to the external antenna through PIN 49 TF\_MAIN. Here encosed a picture with verdegris. ![20191017_085656](https://us1.discourse-cdn.com/flex025/uploads/sierrawireless/original/2X/3/34af41d39a85ff03e6814e5de74a1c0b37bec8fd.jpeg) . The modem seems clean : ![20191017_085755](https://us1.discourse-cdn.com/flex025/uploads/sierrawireless/original/2X/3/3b2cb530e443767cc4a88438cd334157a531faab.jpeg) This controller is in a heated room and its external antenna goes outside with a 2 meter cable. This antenna is IP 68. How could we explain that verdegris is coming? Anyway, this seems that this particular case is solved but I still wonder how to optimize network registration/attach for hilo and HL in general. My initial question is thus still opened. ---
**Author:** ![Donald](https://avatars.discourse-cdn.com/v4/letter/d/ac8455/32.png) [@Donald](https://forum.sierrawireless.com/u/Donald)\ **Post date:** [October 29, 2019, 12:00pm UTC](https://forum.sierrawireless.com/t/hl6528rd-network-registration-issues/17967/3 "2019-10-29T12:00:26Z")
Hi, Some pins of the socket have verdigris in a heated room because they are oxidized by high temperatures. Please clean your socket and modem. Can you check the signal network on HL6528RD with + CSQ command after cleaning the socket and modem? Thanks, ---
**Author:** ![hestia](https://avatars.discourse-cdn.com/v4/letter/h/6bbea6/32.png) [@hestia](https://forum.sierrawireless.com/u/hestia)\ **Post date:** [October 29, 2019, 2:04pm UTC](https://forum.sierrawireless.com/t/hl6528rd-network-registration-issues/17967/4 "2019-10-29T14:04:50Z")
Hi Donald, Thanks for your reply My modem has been working again for 2 weeks after removing the modem and cleaning the socket a bit. The room in which the unit is exposed at the north in the north of France. The temperature never goes over 30 degrees for sure. The only two things that are particular : - The unit (so the modem) is not powered at night and during week ends - The antenna IP68 is going outside : North side of the house, house is close to the sea so exposed to cold saled wind. I’m looking for the possible reasons of oxydation for other sites problems Best regards, Thomas