Just bought 15 pieces of Sierra Wireless MC8790 to use on mobile units (RB411U and RB411UAHR) deployed in the field.

It didn't work at first, and some searching I was worried I've bought the wrong card.

It turned out that this card had several more data-channels than I was justed to.

add add-default-route=yes allow=pap,chap,mschap1,mschap2 data-channel=4 dial-command=ATDT dial-on-demand=yes \
disabled=no info-channel=3 keepalive-timeout=30 max-mru=1500 max-mtu=1500 modem-init=\
"AT+CGDCONT=1,\"IP\",\"internet\"" mrru=disabled name=ppp-out2 null-modem=no password=password phone=*99# pin=\
"" port=usb3 profile=default use-peer-dns=yes user=dj

Ports reveal the channels

[admin@MikroTik] /interface ppp-client> /port print
Flags: I - inactive
# NAME CHANNELS USED-BY BAUD-RATE
0 serial0 1 Serial Console auto
1 usb3 7 9600

and with som AT command you could se the model of the card. I have masked my serial numbers.

[admin@MikroTik] /interface ppp-client> /system serial-terminal port=usb3 channel=3
[Ctrl-A is the prefix key]
ati1
Manufacturer: Sierra Wireless, Incorporated
Model: MC8790
Revision: K2_0_7_35AP C:/WS/FW/K2_0_7_35AP/MSM6290/SRC 2010/03/04 17:37:08
IMEI: 112233445566778
IMEI SV: 16
FSN: 1122334455667
3GPP Release 6
+GCAP: +CGSM,+DS,+ES
OK

PPP info.

[admin@MikroTik] /interface ppp-client> info 1
status: "ready"
pin-status: "no password required"
functionality: "full"
gprs-class: "A - GPRS & GSM simultaneous"
manufacturer: "Sierra Wireless, Incorporated"
model: "MC8790"
revision: "K2_0_7_35AP C:/WS/FW/K2_0_7_35AP/MSM6290/SRC 2010/03/04 17:37:08"
serial-number: "112233445566778"
current-operator: "N Telenor"
access-technology: "3G"
signal-strengh: -109
frame-error-rate: "unknown"

And info from when I'm connected.

[admin@MikroTik] /interface ppp-client> monitor 1
status: "connected"
uptime: 15s
idle-time: 12s
connect-speed: 7200000
mtu: 1500
mru: 1500

Some system information

[admin@MikroTik] /interface ppp-client> /system resource print
uptime: 3h12m54s
version: "5.2"
free-memory: 45924KiB
total-memory: 62196KiB
cpu: "MIPS 24Kc V7.4"
cpu-count: 1
cpu-frequency: 680MHz
cpu-load: 1%
free-hdd-space: 25108KiB
total-hdd-space: 61440KiB
write-sect-since-reboot: 704
write-sect-total: 249351
bad-blocks: 0%
architecture-name: "mipsbe"
board-name: "RB411UAHR"
platform: "MikroTik"

Soon those old RB230 would be replaced.