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--- network_stuff:transit [2023/05/18 13:23] – jotasandoku
+++ network_stuff:transit [2025/08/16 14:44] (current) – jotasandoku
@@ Line 1: / Line 1: @@
+==== NEW SWITCH DEPLOYMENT, BASIC ACCESSORIES, NEVER FORGET!! ====
+  * DATACENTER
+    * (1) RACK PDUs
+  * CISCO ORDER
+    * (2) REDUNDANT PSU
+----
+    * (3) CORRECT POWER CORDS
+    * (4) MOUNTING RAILS!
+    * (5) STACKING CABLES (VSS) 5.1 9300LM HAVE SPECIAL EXPENSIVE T3 TYPES AND NO STACKPOWER
+    * (6) CORRECT TRANSCEIVERS AND CABLES
+----
 **INTERCONNECTION TYPES:**
   * TRANSIT PEERING:
@@ Line 153: / Line 169: @@
 {{:network_stuff:power-connector-types.png?600|}}
-  * C14 male (this connects to the pdus in gyron)
+  * C14 male (this connects to the pdus in gyron); PDUs have C13
   * C19 female: typical of Dell or Sun servers
     * **C14-C19: for servers**
@@ Line 204: / Line 220: @@
 **OPTIC TECHNOLOGIES**\\
-[[https://community.fs.com/blog/name-brands-vs-third-party-transceivers-which-do-you-prefer.html]]
+[[https://community.fs.com/blog/name-brands-vs-third-party-transceivers-which-do-you-prefer.html]] ; [[https://tmgmatrix.cisco.com]]
 \\
 SFP , SFP+(1G or 10G) , SPF28, QSFP , QSFP28, QSFP-DD
@@ Line 213: / Line 229: @@
   * 100G QSFP28 4x(up to)28G : is 100G
       * can break out into x4 or x2 lanes
-      * QSFP28-100-SR4 - MPO connector - MPT12 cable - 100m with OM4 cables (OM3 ~70m)
+      * QSFP28-100-SR4 - MPO connector - MPT12 cable - 100m with OM4 cables (OM3 ~70m) - Be aware of  [[https://www.addonnetworks.com/faq/choosing-mpo|mpo_rules]] when selecting cable
       * QSFP28-100-LR4 - LCLC cable connector - 2km OM4
       * QSFP28-100-LR4-S
@@ Line 220: / Line 236: @@
 DR vs FR: difference is the distance they support. FR is 2km while DR is 500m. Different in the transmitter power and the receiver sensitivity
 \\
+For **single mode, nowadays tends to be OS2 UPC**
+\\
 Modulation:\\
   * NRZ (low/high) for short distances
@@ Line 430: / Line 447: @@
   * From pps to bps = multiply by 4000
+----
+=== LTE DONGLE ===
+[[ https://openwrt.org/docs/guide-user/network/wan/wwan/ltedongle ]]
+  * Specs:
+    * Chipset brand: ZTE, Qualcom...
+    * Serial protocols: QMI or MBIM ((QMA is Qualcomm proprietary; others: NCM, ECM, RNDIS))
+When connected to the rpi:
+  You won’t find a TTY device because the dongle is in cdc_ether (network) mode.
+  Check ip link show for a usb0-style interface.
+  If you actually want a serial modem for AT commands, you have to unbind cdc_ether and bind the option driver so /dev/ttyUSB* appears.
+  If your connection is already “100% working” in network mode, you can just treat it like an Ethernet device—no TTY required.
+  root@rpi4:/dev# usb-devices | awk '/12d1/' RS=
+    T:  Bus=01 Lev=02 Prnt=03 Port=02 Cnt=01 Dev#=  5 Spd=480 MxCh= 0
+    D:  Ver= 2.00 Cls=02(commc) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
+    P:  Vendor=12d1 ProdID=1591 Rev=01.02
+    S:  Manufacturer=HUAWEI_MOBILE
+    S:  Product=HUAWEI_MOBILE
+    C:  #Ifs= 2 Cfg#= 1 Atr=80 MxPwr=2mA
+    I:  If#= 0 Alt= 0 #EPs= 1 Cls=02(commc) Sub=06 Prot=00 Driver=cdc_ether <<<
+    E:  Ad=83(I) Atr=03(Int.) MxPS=  16 Ivl=2ms
+    I:  If#= 1 Alt= 1 #EPs= 2 Cls=0a(data ) Sub=00 Prot=00 Driver=cdc_ether <<<
+    E:  Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
+    E:  Ad=82(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
+Sometimes they don't need to be QMI or MBIMQMI or MBIM  devices typically create a /dev/cdc-wdm# interface and use specialized drivers (qmi_wwan or cdc_mbim), along with user-space tools like qmicli or mbimcli. CDC-Ether (NCM) devices show up simply as a USB-Ethernet interface
+----
+=== STACKWISE CABLES ===
+  * STACK-T1 can be used for C3850 and in C9300 (BUT NOT IN THE LM SERIES(*)
+  * FOR THE C9300LM WE NEED StackWise-320 Kit: The C9300L-STAK-KIT2-M ; The 9300LM don't run stackpower but need these more complicated cables

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