Fix Eltex a lot model.

Add Telindus
Add serial to Zixel

lib/SNMP/Info/Layer2/Zyxel.pm

@@ -24,6 +24,7 @@ $VERSION = '3.70-135';
 
 %GLOBALS = (
     %SNMP::Info::Layer2::GLOBALS,
+    'serial_oid' => 'transmission.94.1.1.2.1.1.1',
 );
 
 %FUNCS = ( %SNMP::Info::Layer2::FUNCS, );
@@ -51,6 +52,11 @@ sub model {
     return 'unknown';
 }
 
+sub serial {
+    my $obj = shift;
+    return $obj->serial_oid;
+}
+
 1;
 __END__