diff --git a/target/linux/lantiq/base-files/etc/board.d/02_network b/target/linux/lantiq/base-files/etc/board.d/02_network
index 6ab5cb979e847e896675144468279e55475f86fc..41d6b7fab3a3d5e01d74620880b6805413bf55ad 100755
--- a/target/linux/lantiq/base-files/etc/board.d/02_network
+++ b/target/linux/lantiq/base-files/etc/board.d/02_network
@@ -168,7 +168,7 @@ if [ -n "$(ls /lib/modules/`uname -r`/ltq_atm*)" ]; then
 	ucidef_add_atm_bridge "$vpi" "$vci" "$encaps" "$payload"
 fi
 
-if grep -qE "system type.*: (VR9|xRX200)" /proc/cpuinfo; then
+if lantiq_is_vdsl_system; then
 	interface_wan="ptm0"
 	ucidef_add_vdsl_modem "$annex" "av" "ptm"
 else
diff --git a/target/linux/lantiq/base-files/lib/functions/lantiq.sh b/target/linux/lantiq/base-files/lib/functions/lantiq.sh
index e4eb4d723f19d147c36f2d7b2ef818b55e8b5f7f..630832e512ce0b8c759c3775951a92fa8c5800b0 100644
--- a/target/linux/lantiq/base-files/lib/functions/lantiq.sh
+++ b/target/linux/lantiq/base-files/lib/functions/lantiq.sh
@@ -39,3 +39,7 @@ lantiq_get_dt_led() {
 
 	echo "$label"
 }
+
+lantiq_is_vdsl_system() {
+	grep -qE "system type.*: (VR9|xRX200)" /proc/cpuinfo
+}