SL8082T + Mikrotik RB750UP

Hello.
We use Sierra production in gas\oil automatization with thousands pcs.
Many time we used a bundle: Mikrtotik RB750UP + SIerra SL8082. All works fine. But recently we knows that SL8082, SL8083 production will stop. I try SL8082T as alternative, but now we fail to use RB750UP + SIerra SL8082T.
I contact with Mikrotik support, but they link to Sierra support.
Now i have next situation: Mikrotik successfull connect to network, get true ip address, dns servers, but any user data dropped. I see that data transfered to network, but no answer. On identical configuration with SL8082 all works good, so it’s not a Mikrotik firewall problem.
I can provide remote access (ssh) to Mikrotik device with SL8082T connected.
I think that reasonably engage Mikrotik tech support specialist into this thread.
Thanks.

Mikrotik connection log with SL8082T:
Jan/02/1970 00:00:19 route,debug,calc End calculation
Jan/02/1970 00:00:19 route,debug End redistribution
Jan/02/1970 00:00:20 async,debug usb1:3: sent ATH
Jan/02/1970 00:00:20 async,debug usb1:3: rcvd OK
Jan/02/1970 00:00:20 async,ppp,info ppp-out1: initializing modem…
Jan/02/1970 00:00:21 async,ppp,info ppp-out1: dialing out…
Jan/02/1970 00:00:21 async,debug usb1:3: sent AT+CGDCONT=1,“IP”,“paramapn54.ural”
Jan/02/1970 00:00:21 async,debug usb1:3: rcvd OK
Jan/02/1970 00:00:21 async,debug usb1:3: sent ATDT99**1#
Jan/02/1970 00:00:21 async,debug usb1:3: rcvd CONNECT 115200
Jan/02/1970 00:00:21 async,ppp,debug ppp-out1: LCP lowerup
Jan/02/1970 00:00:21 async,ppp,debug ppp-out1: LCP open
Jan/02/1970 00:00:21 async,ppp,debug,packet ppp-out1: sent LCP ConfReq id=0x1
Jan/02/1970 00:00:21 async,ppp,debug,packet <magic 0x3bc4981a>
Jan/02/1970 00:00:21 async,ppp,debug,packet
Jan/02/1970 00:00:21 async,ppp,debug,packet
Jan/02/1970 00:00:21 async,ppp,debug,packet <mrru 1600>
Jan/02/1970 00:00:21 async,ppp,debug,packet ppp-out1: rcvd LCP ConfRej id=0x1
Jan/02/1970 00:00:21 async,ppp,debug,packet <mrru 1600>
Jan/02/1970 00:00:21 async,ppp,debug,packet ppp-out1: sent LCP ConfReq id=0x2
Jan/02/1970 00:00:21 async,ppp,debug,packet <magic 0x3bc4981a>
Jan/02/1970 00:00:21 async,ppp,debug,packet
Jan/02/1970 00:00:21 async,ppp,debug,packet
Jan/02/1970 00:00:21 async,ppp,debug,packet ppp-out1: rcvd LCP ConfAck id=0x2
Jan/02/1970 00:00:21 async,ppp,debug,packet <magic 0x3bc4981a>
Jan/02/1970 00:00:21 async,ppp,debug,packet
Jan/02/1970 00:00:21 async,ppp,debug,packet
Jan/02/1970 00:00:21 route,debug,event Interface change
Jan/02/1970 00:00:21 route,debug,event interface=ether5-slave-local
Jan/02/1970 00:00:21 route,debug,event status=UP,RUNNING
Jan/02/1970 00:00:21 route,debug,event mtu=1500
Jan/02/1970 00:00:22 async,ppp,debug ppp-out1: LCP timer
Jan/02/1970 00:00:22 async,ppp,debug,packet ppp-out1: sent LCP ConfReq id=0x3
Jan/02/1970 00:00:22 async,ppp,debug,packet <magic 0x3bc4981a>
Jan/02/1970 00:00:22 async,ppp,debug,packet
Jan/02/1970 00:00:22 async,ppp,debug,packet
Jan/02/1970 00:00:22 async,ppp,debug,packet ppp-out1: rcvd LCP ConfAck id=0x3
Jan/02/1970 00:00:22 async,ppp,debug,packet <magic 0x3bc4981a>
Jan/02/1970 00:00:22 async,ppp,debug,packet
Jan/02/1970 00:00:22 async,ppp,debug,packet
Jan/02/1970 00:00:24 async,ppp,debug ppp-out1: LCP timer
Jan/02/1970 00:00:24 async,ppp,debug,packet ppp-out1: sent LCP ConfReq id=0x4
Jan/02/1970 00:00:24 async,ppp,debug,packet <magic 0x3bc4981a>
Jan/02/1970 00:00:24 async,ppp,debug,packet
Jan/02/1970 00:00:24 async,ppp,debug,packet
Jan/02/1970 00:00:24 async,ppp,debug,packet ppp-out1: rcvd LCP ConfAck id=0x4
Jan/02/1970 00:00:24 async,ppp,debug,packet <magic 0x3bc4981a>
Jan/02/1970 00:00:24 async,ppp,debug,packet
Jan/02/1970 00:00:24 async,ppp,debug,packet
Jan/02/1970 00:00:24 async,ppp,debug,packet ppp-out1: rcvd LCP ConfReq id=0x1
Jan/02/1970 00:00:24 async,ppp,debug,packet <mru 1500>
Jan/02/1970 00:00:24 async,ppp,debug,packet <asyncmap 0x0>
Jan/02/1970 00:00:24 async,ppp,debug,packet <magic 0x69eb6f31>
Jan/02/1970 00:00:24 async,ppp,debug,packet
Jan/02/1970 00:00:24 async,ppp,debug,packet
Jan/02/1970 00:00:24 async,ppp,debug,packet
Jan/02/1970 00:00:24 async,ppp,debug,packet ppp-out1: sent LCP ConfAck id=0x1
Jan/02/1970 00:00:24 async,ppp,debug,packet <mru 1500>
Jan/02/1970 00:00:24 async,ppp,debug,packet <asyncmap 0x0>
Jan/02/1970 00:00:24 async,ppp,debug,packet <magic 0x69eb6f31>
Jan/02/1970 00:00:24 async,ppp,debug,packet
Jan/02/1970 00:00:24 async,ppp,debug,packet
Jan/02/1970 00:00:24 async,ppp,debug,packet
Jan/02/1970 00:00:24 async,ppp,debug ppp-out1: LCP opened
Jan/02/1970 00:00:24 async,ppp,debug,packet ppp-out1: sent PAP AuthReq id=0x1
Jan/02/1970 00:00:24 async,ppp,debug,packet
Jan/02/1970 00:00:24 async,ppp,debug,packet
Jan/02/1970 00:00:27 async,ppp,debug,packet ppp-out1: rcvd PAP AuthAck id=0x1
Jan/02/1970 00:00:27 async,ppp,debug,packet Welcome!
Jan/02/1970 00:00:27 async,ppp,info ppp-out1: authenticated
Jan/02/1970 00:00:27 async,ppp,debug ppp-out1: IPCP lowerup
Jan/02/1970 00:00:27 async,ppp,debug ppp-out1: IPCP open
Jan/02/1970 00:00:27 async,ppp,debug,packet ppp-out1: sent IPCP ConfReq id=0x1
Jan/02/1970 00:00:27 async,ppp,debug,packet <addr 0.0.0.0>
Jan/02/1970 00:00:27 async,ppp,debug,packet <ms-dns 0.0.0.0>
Jan/02/1970 00:00:27 async,ppp,debug,packet <ms-dns 0.0.0.0>
Jan/02/1970 00:00:27 async,ppp,debug ppp-out1: IPV6CP open
Jan/02/1970 00:00:27 async,ppp,debug ppp-out1: MPLSCP lowerup
Jan/02/1970 00:00:27 async,ppp,debug ppp-out1: MPLSCP open
Jan/02/1970 00:00:27 async,ppp,debug,packet ppp-out1: sent MPLSCP ConfReq id=0x1
Jan/02/1970 00:00:27 async,ppp,debug ppp-out1: BCP open
Jan/02/1970 00:00:27 async,ppp,debug ppp-out1: CCP lowerup
Jan/02/1970 00:00:27 async,ppp,debug ppp-out1: CCP open
Jan/02/1970 00:00:27 async,ppp,debug,packet ppp-out1: rcvd IPCP ConfReq id=0x1
Jan/02/1970 00:00:27 async,ppp,debug,packet <addr 192.168.111.111>
Jan/02/1970 00:00:27 async,ppp,debug,packet ppp-out1: sent IPCP ConfAck id=0x1
Jan/02/1970 00:00:27 async,ppp,debug,packet <addr 192.168.111.111>
Jan/02/1970 00:00:27 async,ppp,debug,packet ppp-out1: rcvd IPCP ConfRej id=0x1
Jan/02/1970 00:00:27 async,ppp,debug,packet <ms-dns 0.0.0.0>
Jan/02/1970 00:00:27 async,ppp,debug,packet <ms-dns 0.0.0.0>
Jan/02/1970 00:00:27 async,ppp,debug,packet ppp-out1: sent IPCP ConfReq id=0x2
Jan/02/1970 00:00:27 async,ppp,debug,packet <addr 0.0.0.0>
Jan/02/1970 00:00:27 async,ppp,debug,packet ppp-out1: rcvd LCP ProtRej id=0xf
Jan/02/1970 00:00:27 async,ppp,debug,packet 82 81 01 01 00 04
Jan/02/1970 00:00:27 async,ppp,debug,packet ppp-out1: rcvd IPCP ConfNak id=0x2
Jan/02/1970 00:00:27 async,ppp,debug,packet <addr 192.168.1.2>
Jan/02/1970 00:00:27 async,ppp,debug,packet ppp-out1: sent IPCP ConfReq id=0x3
Jan/02/1970 00:00:27 async,ppp,debug,packet <addr 192.168.1.2>
Jan/02/1970 00:00:27 async,ppp,debug,packet ppp-out1: rcvd IPCP ConfAck id=0x3
Jan/02/1970 00:00:27 async,ppp,debug,packet <addr 192.168.1.2>
Jan/02/1970 00:00:27 async,ppp,debug ppp-out1: IPCP opened
Jan/02/1970 00:00:27 async,ppp,info ppp-out1: connected
Jan/02/1970 00:00:27 route,debug,event Interface change
Jan/02/1970 00:00:27 route,debug,event interface=ppp-out1
Jan/02/1970 00:00:27 route,debug,event status=UP,RUNNING
Jan/02/1970 00:00:27 route,debug,event mtu=1500
Jan/02/1970 00:00:27 route,debug,event Interface change
Jan/02/1970 00:00:27 route,debug,event interface=ppp-out1
Jan/02/1970 00:00:27 route,debug,event status=UP,RUNNING
Jan/02/1970 00:00:27 route,debug,event mtu=1500
Jan/02/1970 00:00:27 route,debug,calc Begin calculation
Jan/02/1970 00:00:27 route,debug,event Link up
Jan/02/1970 00:00:27 route,debug,event interface=ppp-out1
Jan/02/1970 00:00:27 route,debug,event Update
Jan/02/1970 00:00:27 route,debug,event interface=ppp-out1
Jan/02/1970 00:00:27 route,debug,event Added candidate route
Jan/02/1970 00:00:27 route,debug,event dst-prefix=0.0.0.0/0
Jan/02/1970 00:00:27 route,debug,event attributes
Jan/02/1970 00:00:27 route,debug,event protocol=DYNAMIC
Jan/02/1970 00:00:27 route,debug,event distance=1
Jan/02/1970 00:00:27 route,debug,event scope=30
Jan/02/1970 00:00:27 route,debug,event target-scope=10
Jan/02/1970 00:00:27 route,debug,event next-hop= address=192.168.111.111
Jan/02/1970 00:00:27 route,debug,event origin-type=DYNAMIC
Jan/02/1970 00:00:27 route,debug,calc End calculation
Jan/02/1970 00:00:27 route,debug Begin redistribution
Jan/02/1970 00:00:27 route,debug Accept 0.0.0.0/0
Jan/02/1970 00:00:27 route,debug Commit prefix 0.0.0.0/0
Jan/02/1970 00:00:27 route,debug End redistribution
Jan/02/1970 00:00:27 route,debug,calc Begin calculation
Jan/02/1970 00:00:27 route,debug,event Address added or changed
Jan/02/1970 00:00:27 route,debug,event local=192.168.1.2
Jan/02/1970 00:00:27 route,debug,event network=192.168.111.111/32
Jan/02/1970 00:00:27 route,debug,event interface=ppp-out1
Jan/02/1970 00:00:27 route,debug,event Added candidate route
Jan/02/1970 00:00:27 route,debug,event dst-prefix=192.168.111.111/32
Jan/02/1970 00:00:27 route,debug,event attributes
Jan/02/1970 00:00:27 route,debug,event protocol=CONNECT
Jan/02/1970 00:00:27 route,debug,event distance=0
Jan/02/1970 00:00:27 route,debug,event scope=10
Jan/02/1970 00:00:27 route,debug,event target-scope=0
Jan/02/1970 00:00:27 route,debug,event connected-net= address=192.168.1.2/32 interface=ppp-out1
Jan/02/1970 00:00:27 route,debug,event routing-mark=main
Jan/02/1970 00:00:27 route,debug,event table=main
Jan/02/1970 00:00:27 route,debug,event origin-type=CONNECTED
Jan/02/1970 00:00:27 route,debug,calc Tag next hop for recalculation
Jan/02/1970 00:00:27 route,debug,calc address=192.168.111.111
Jan/02/1970 00:00:27 route,debug,calc Select route
Jan/02/1970 00:00:27 route,debug,calc dst-address=192.168.111.111/32
Jan/02/1970 00:00:27 route,debug,calc attributes
Jan/02/1970 00:00:27 route,debug,calc protocol=CONNECT
Jan/02/1970 00:00:27 route,debug,calc distance=0
Jan/02/1970 00:00:27 route,debug,calc scope=10
Jan/02/1970 00:00:27 route,debug,calc target-scope=0
Jan/02/1970 00:00:27 route,debug,calc connected-net= address=192.168.1.2/32 interface=ppp-out1
Jan/02/1970 00:00:27 route,debug,calc routing-mark=main
Jan/02/1970 00:00:27 route,debug,calc table=main
Jan/02/1970 00:00:27 route,debug,calc origin-type=CONNECTED
Jan/02/1970 00:00:27 route,debug,calc Next hop resolved
Jan/02/1970 00:00:27 route,debug,calc address=192.168.111.111
Jan/02/1970 00:00:27 route,debug,calc route=192.168.111.111/32
Jan/02/1970 00:00:27 route,debug,calc immediate-address=192.168.111.111
Jan/02/1970 00:00:27 route,debug,calc interface=ppp-out1
Jan/02/1970 00:00:27 route,debug,calc Select route
Jan/02/1970 00:00:27 route,debug,calc dst-address=0.0.0.0/0
Jan/02/1970 00:00:27 route,debug,calc attributes
Jan/02/1970 00:00:27 route,debug,calc protocol=DYNAMIC
Jan/02/1970 00:00:27 route,debug,calc distance=1
Jan/02/1970 00:00:27 route,debug,calc scope=30
Jan/02/1970 00:00:27 route,debug,calc target-scope=10
Jan/02/1970 00:00:27 route,debug,calc next-hop= address=192.168.111.111
Jan/02/1970 00:00:27 route,debug,calc origin-type=DYNAMIC
Jan/02/1970 00:00:27 route,debug,calc End calculation
Jan/02/1970 00:00:27 route,debug Begin redistribution
Jan/02/1970 00:00:27 route,debug Accept add 192.168.111.111/32
Jan/02/1970 00:00:27 route,debug Accept add 0.0.0.0/0
Jan/02/1970 00:00:27 route,debug Commit prefix 0.0.0.0/0
Jan/02/1970 00:00:27 route,debug Commit prefix 192.168.111.111/32
Jan/02/1970 00:00:27 route,debug End redistribution
Jan/02/1970 00:00:54 async,ppp,debug,packet ppp-out1: sent LCP EchoReq id=0x0
Jan/02/1970 00:00:54 async,ppp,debug,packet <magic 0x3bc4981a>
Jan/02/1970 00:00:54 async,ppp,debug,packet ppp-out1: rcvd LCP EchoRep id=0x0
Jan/02/1970 00:00:54 async,ppp,debug,packet <magic 0x69eb6f31>
Jan/02/1970 00:01:24 async,ppp,debug,packet ppp-out1: sent LCP EchoReq id=0x1
Jan/02/1970 00:01:24 async,ppp,debug,packet <magic 0x3bc4981a>
Jan/02/1970 00:01:24 async,ppp,debug,packet ppp-out1: rcvd LCP EchoRep id=0x1
Jan/02/1970 00:01:24 async,ppp,debug,packet <magic 0x69eb6f31>
Jan/02/1970 00:01:54 async,ppp,debug,packet ppp-out1: sent LCP EchoReq id=0x2
Jan/02/1970 00:01:54 async,ppp,debug,packet <magic 0x3bc4981a>
Jan/02/1970 00:01:54 async,ppp,debug,packet ppp-out1: rcvd LCP EchoRep id=0x2
Jan/02/1970 00:01:54 async,ppp,debug,packet <magic 0x69eb6f31>
Jan/02/1970 00:02:24 async,ppp,debug,packet ppp-out1: sent LCP EchoReq id=0x3
Jan/02/1970 00:02:24 async,ppp,debug,packet <magic 0x3bc4981a>
Jan/02/1970 00:02:24 async,ppp,debug,packet ppp-out1: rcvd LCP EchoRep id=0x3
Jan/02/1970 00:02:24 async,ppp,debug,packet <magic 0x69eb6f31>
Jan/02/1970 00:02:54 async,ppp,debug,packet ppp-out1: sent LCP EchoReq id=0x4
Jan/02/1970 00:02:54 async,ppp,debug,packet <magic 0x3bc4981a>
Jan/02/1970 00:02:54 async,ppp,debug,packet ppp-out1: rcvd LCP EchoRep id=0x4
Jan/02/1970 00:02:54 async,ppp,debug,packet <magic 0x69eb6f31>

Hi,

Are you testing with latest FW and have you contact your local FAE/distributor?

There are several ways to check and move forward, getting contact with your FAE is the best way to solve this problem quickly, for example to take FW logs and analyze them…

Thx

Thanks for your answer.
While we are waiting answer from our local distributor, i’m trying to run manual ppp connection SL8082T on my linux (3.2.18) embedded device.
I configure drivers and pppd daemon on my device, and SL8082 connect and work fine.
SL8082T modem can’t connect to network. May be i use wrong AT-commands?
Thanks.
I use two variants of AT-commands:

  1. Standart. And have next errors:
    AT
    OK
    ATZ
    OK
    AT+CGDCONT=1,“IP”,“paramapn54.ural”
    OK
    ATD99**1#
    CONNECT
    Script /usr/sbin/chat -v -f /etc/ppp/chat-3g-mts finished (pid 731), status = 0x0
    Serial connection established.
    using channel 10
    Using interface ppp0
    Connect: ppp0 <–> /dev/ttyUSB3
    sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0xd8698a69> ]
    rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0xd8698a69> ]
    rcvd [LCP ConfReq id=0x1 <mru 1500> <asyncmap 0x0> <magic 0x1e25e8c6> ]
    No auth is possible
    sent [LCP ConfRej id=0x1 ]
    rcvd [LCP ConfReq id=0x2 <mru 1500> <asyncmap 0x0> <magic 0x1e25e8c6> ]
    sent [LCP ConfAck id=0x2 <mru 1500> <asyncmap 0x0> <magic 0x1e25e8c6> ]
    sent [IPCP ConfReq id=0x1 <compress VJ 0f 01> <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns2 0.0.0.0>]
    rcvd [LCP TermReq id=0x3]
    LCP terminated by peer
    sent [LCP TermAck id=0x3]
    Connection terminated.
    Modem hangup

  2. Ext. AT-commands. With next errors:
    AT
    OK
    AT+CGDCONT=1,“IP”,“paramapn54.ural”
    OK
    AT!SCDFTPROF=3
    OK
    AT!SCPROF=3,"",0,0,0,0
    OK
    AT!SCACT=1,3
    OK
    Script /usr/sbin/chat -v -f /etc/ppp/chat-3g-mts finished (pid 740), status = 0x0
    Serial connection established.
    using channel 12
    Using interface ppp0
    Connect: ppp0 <–> /dev/ttyUSB3
    sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0xdbb0655> ]
    rcvd [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0xdbb0655> ]
    sent [LCP ConfNak id=0x1 <magic 0xb4a42c59>]
    rcvd [LCP ConfNak id=0x1 <magic 0xb4a42c59>]
    sent [LCP ConfReq id=0x2 <asyncmap 0x0> <magic 0x712b3016> ]
    rcvd [LCP ConfReq id=0x2 <asyncmap 0x0> <magic 0x712b3016> ]
    sent [LCP ConfNak id=0x2 <magic 0xa9c2a985>]
    rcvd [LCP ConfNak id=0x2 <magic 0xa9c2a985>]
    sent [LCP ConfReq id=0x3 <asyncmap 0x0> <magic 0x50f6ff9> ]
    rcvd [LCP ConfReq id=0x3 <asyncmap 0x0> <magic 0x50f6ff9> ]
    sent [LCP ConfNak id=0x3 <magic 0xae9eff57>]
    rcvd [LCP ConfNak id=0x3 <magic 0xae9eff57>]
    sent [LCP ConfReq id=0x4 <asyncmap 0x0> <magic 0x7bec7391> ]
    rcvd [LCP ConfReq id=0x4 <asyncmap 0x0> <magic 0x7bec7391> ]
    sent [LCP ConfNak id=0x4 <magic 0x83de4799>]
    rcvd [LCP ConfNak id=0x4 <magic 0x83de4799>]
    sent [LCP ConfReq id=0x5 <asyncmap 0x0> <magic 0x2fa406bc> ]
    rcvd [LCP ConfReq id=0x5 <asyncmap 0x0> <magic 0x2fa406bc> ]
    sent [LCP ConfNak id=0x5 <magic 0x60563154>]
    rcvd [LCP ConfNak id=0x5 <magic 0x60563154>]
    sent [LCP ConfReq id=0x6 <asyncmap 0x0> <magic 0x2ee9f9eb> ]
    rcvd [LCP ConfReq id=0x6 <asyncmap 0x0> <magic 0x2ee9f9eb> ]
    sent [LCP ConfNak id=0x6 <magic 0xfff1807b>]
    rcvd [LCP ConfNak id=0x6 <magic 0xfff1807b>]
    sent [LCP ConfReq id=0x7 <asyncmap 0x0> <magic 0xd051234c> ]
    rcvd [LCP ConfReq id=0x7 <asyncmap 0x0> <magic 0xd051234c> ]
    sent [LCP ConfNak id=0x7 <magic 0x195158d8>]
    rcvd [LCP ConfNak id=0x7 <magic 0x195158d8>]
    sent [LCP ConfReq id=0x8 <asyncmap 0x0> <magic 0xed288380> ]
    rcvd [LCP ConfReq id=0x8 <asyncmap 0x0> <magic 0xed288380> ]
    sent [LCP ConfNak id=0x8 <magic 0xceadf3ab>]
    rcvd [LCP ConfNak id=0x8 <magic 0xceadf3ab>]
    sent [LCP ConfReq id=0x9 <asyncmap 0x0> <magic 0x5c7aaad6> ]
    rcvd [LCP ConfReq id=0x9 <asyncmap 0x0> <magic 0x5c7aaad6> ]
    sent [LCP ConfNak id=0x9 <magic 0x90c57ed5>]
    rcvd [LCP ConfNak id=0x9 <magic 0x90c57ed5>]
    sent [LCP ConfReq id=0xa <asyncmap 0x0> <magic 0x53fe4a1e> ]
    rcvd [LCP ConfReq id=0xa <asyncmap 0x0> <magic 0x53fe4a1e> ]
    sent [LCP ConfNak id=0xa <magic 0x6d193588>]
    rcvd [LCP ConfNak id=0xa <magic 0x6d193588>]
    Serial line is looped back.
    sent [LCP TermReq id=0xb “Loopback detected”]
    rcvd [LCP TermReq id=0xb “Loopback detected”]
    sent [LCP TermAck id=0xb]
    rcvd [LCP TermAck id=0xb]
    Connection terminated.

hi all,

I am used HL6528 gsm module to do a ppp connection how I can get IP address by pppd and I am configure drivers and pppd daemon on my device, and hl6528 connect and work fine i can make calls.
hl6528 modem can’t connect to network. May be i use wrong AT-commands? what types AT command use for network connection?

  1. How do I get ppp0 to be a device? ex ifconfig ppp0
  2. Is there a permanent way of changing the Iface in route to ppp0?

Are you sure that ttyUSB3 is the correct port. I don’t have access to a SL8082T at the moment but I believe that ttyUSB2 should be used. Easiest to check is to use minicom and send some at commands manually.