diff --git a/device-types/3Com/4200G-48_Port.yml b/device-types/3Com/4200G-48_Port.yml
index 4cf8745c0..06bb1a453 100644
--- a/device-types/3Com/4200G-48_Port.yml
+++ b/device-types/3Com/4200G-48_Port.yml
@@ -158,7 +158,7 @@ interfaces:
     type: 1000base-t
     mgmt_only: false
   - name: 'GigabitEthernet1/0/49'
-    type: 1000base-t
+    type: 1000base-x-sfp
     mgmt_only: false
   - name: 'GigabitEthernet1/0/50'
     type: 1000base-x-sfp
@@ -169,8 +169,5 @@ interfaces:
   - name: 'GigabitEthernet1/0/52'
     type: 1000base-x-sfp
     mgmt_only: false
-  - name: 'GigabitEthernet1/0/53'
-    type: 1000base-x-sfp
-    mgmt_only: false
   - name: 'Vlan-interface1'
     type: virtual
diff --git a/device-types/3Com/4210G-24_Port.yml b/device-types/3Com/4210G-24_Port.yml
new file mode 100644
index 000000000..1269fa0a1
--- /dev/null
+++ b/device-types/3Com/4210G-24_Port.yml
@@ -0,0 +1,101 @@
+---
+manufacturer: 3Com
+model: 4210G 24-port
+slug: 4210g-24port
+part_number: 3CRS42G-24-91
+u_height: 1
+is_full_depth: false
+console-ports:
+  - name: console
+    type: rj-45
+power-ports:
+  - name: PS1
+    type: iec-60320-c14
+    maximum_draw: 58
+interfaces:
+  - name: 'GigabitEthernet1/0/1'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/2'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/3'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/4'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/5'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/6'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/7'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/8'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/9'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/10'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/11'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/12'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/13'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/14'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/15'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/16'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/17'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/18'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/19'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/20'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/21'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/22'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/23'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/24'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/25'
+    type: 1000base-x-sfp
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/26'
+    type: 1000base-x-sfp
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/27'
+    type: 1000base-x-sfp
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/28'
+    type: 1000base-x-sfp
+    mgmt_only: false
+  - name: 'Vlan-interface1'
+    type: virtual
diff --git a/device-types/3Com/4210G-48_Port.yml b/device-types/3Com/4210G-48_Port.yml
new file mode 100644
index 000000000..8ba3a7e20
--- /dev/null
+++ b/device-types/3Com/4210G-48_Port.yml
@@ -0,0 +1,173 @@
+---
+manufacturer: 3Com
+model: 4210G 48-port
+slug: 4210g-48port
+part_number: 3CRS42G-48-91
+u_height: 1
+is_full_depth: false
+console-ports:
+  - name: console
+    type: rj-45
+power-ports:
+  - name: PS1
+    type: iec-60320-c14
+    maximum_draw: 108
+interfaces:
+  - name: 'GigabitEthernet1/0/1'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/2'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/3'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/4'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/5'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/6'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/7'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/8'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/9'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/10'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/11'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/12'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/13'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/14'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/15'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/16'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/17'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/18'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/19'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/20'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/21'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/22'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/23'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/24'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/25'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/26'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/27'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/28'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/29'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/30'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/31'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/32'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/33'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/34'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/35'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/36'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/37'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/38'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/39'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/40'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/41'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/42'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/43'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/44'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/45'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/46'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/47'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/48'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/49'
+    type: 1000base-x-sfp
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/50'
+    type: 1000base-x-sfp
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/51'
+    type: 1000base-x-sfp
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/52'
+    type: 1000base-x-sfp
+    mgmt_only: false
+  - name: 'Vlan-interface1'
+    type: virtual
diff --git a/device-types/3Com/4210G-PWR-24_Port.yml b/device-types/3Com/4210G-PWR-24_Port.yml
new file mode 100644
index 000000000..e17fb927b
--- /dev/null
+++ b/device-types/3Com/4210G-PWR-24_Port.yml
@@ -0,0 +1,102 @@
+---
+manufacturer: 3Com
+model: 4210G PWR 24-port
+slug: 4210g-pwr-24port
+part_number: 3CRS42G-24P-91
+u_height: 1
+is_full_depth: false
+console-ports:
+  - name: console
+    type: rj-45
+power-ports:
+  - name: PS1
+    type: iec-60320-c14
+    allocated_draw: 87
+    maximum_draw: 370
+interfaces:
+  - name: 'GigabitEthernet1/0/1'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/2'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/3'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/4'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/5'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/6'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/7'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/8'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/9'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/10'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/11'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/12'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/13'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/14'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/15'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/16'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/17'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/18'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/19'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/20'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/21'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/22'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/23'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/24'
+    type: 1000base-t
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/25'
+    type: 1000base-x-sfp
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/26'
+    type: 1000base-x-sfp
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/27'
+    type: 1000base-x-sfp
+    mgmt_only: false
+  - name: 'GigabitEthernet1/0/28'
+    type: 1000base-x-sfp
+    mgmt_only: false
+  - name: 'Vlan-interface1'
+    type: virtual