diff --git a/master/domain.c b/master/domain.c
index 4d4260603894d6d245878cb6701a761785f2ae48..f6c4c09a87300c0b28f29c320b44991bbb0b2c74 100644
--- a/master/domain.c
+++ b/master/domain.c
@@ -54,7 +54,7 @@ typedef struct
 {
     struct list_head list; /**< list item */
     ec_slave_t *slave; /**< slave */
-    const ec_sii_sync_t *sync; /**< sync manager */
+    const ec_sync_t *sync; /**< sync manager */
     off_t sync_offset; /**< pdo offset */
     void **data_ptr; /**< pointer to process data pointer(s) */
 }
@@ -196,7 +196,7 @@ int ec_domain_reg_pdo_entry(ec_domain_t *domain, /**< EtherCAT domain */
                             )
 {
     ec_data_reg_t *data_reg;
-    const ec_sii_sync_t *sync;
+    const ec_sync_t *sync;
     const ec_pdo_t *other_pdo;
     const ec_pdo_entry_t *other_entry;
     unsigned int bit_offset, byte_offset;
@@ -265,7 +265,7 @@ int ec_domain_reg_pdo_range(ec_domain_t *domain, /**< EtherCAT domain */
                             )
 {
     ec_data_reg_t *data_reg;
-    ec_sii_sync_t *sync;
+    ec_sync_t *sync;
     uint16_t sync_length;
 
     if (!(sync = ec_slave_get_pdo_sync(slave, dir))) {
diff --git a/master/slave.c b/master/slave.c
index e2121aecd7d47b285a4c90e6ce0044d5e485aa91..eab68e6810c2dc2a6d29816c8fa0ce6f2c6c8d7a 100644
--- a/master/slave.c
+++ b/master/slave.c
@@ -482,12 +482,12 @@ int ec_slave_fetch_sii_syncs(
         )
 {
     unsigned int i;
-    ec_sii_sync_t *sync;
+    ec_sync_t *sync;
 
     // sync manager struct is 4 words long
     slave->sii_sync_count = word_count / 4;
 
-    if (!(slave->sii_syncs = kmalloc(sizeof(ec_sii_sync_t) *
+    if (!(slave->sii_syncs = kmalloc(sizeof(ec_sync_t) *
                     slave->sii_sync_count, GFP_ATOMIC))) {
         EC_ERR("Failed to allocate Sync-Manager memory.\n");
         return -1;
@@ -608,7 +608,7 @@ char *ec_slave_sii_string(
 
 int ec_slave_prepare_fmmu(ec_slave_t *slave, /**< EtherCAT slave */
                           const ec_domain_t *domain, /**< domain */
-                          const ec_sii_sync_t *sync  /**< sync manager */
+                          const ec_sync_t *sync  /**< sync manager */
                           )
 {
     unsigned int i;
@@ -654,7 +654,7 @@ size_t ec_slave_info(const ec_slave_t *slave, /**< EtherCAT slave */
                      )
 {
     off_t off = 0;
-    ec_sii_sync_t *sync;
+    ec_sync_t *sync;
     ec_pdo_t *pdo;
     ec_pdo_entry_t *pdo_entry;
     int first, i;
@@ -1067,7 +1067,7 @@ ssize_t ec_store_slave_attribute(struct kobject *kobj, /**< slave's kobject */
 
 uint16_t ec_slave_calc_sync_size(const ec_slave_t *slave,
                                  /**< EtherCAT slave */
-                                 const ec_sii_sync_t *sync
+                                 const ec_sync_t *sync
                                  /**< sync manager */
                                  )
 {
@@ -1100,7 +1100,7 @@ uint16_t ec_slave_calc_sync_size(const ec_slave_t *slave,
 /**
  */
 
-ec_sii_sync_t *ec_slave_get_pdo_sync(
+ec_sync_t *ec_slave_get_pdo_sync(
         ec_slave_t *slave, /**< EtherCAT slave */
         ec_direction_t dir /**< input or output */
         )
@@ -1133,7 +1133,7 @@ ec_sii_sync_t *ec_slave_get_pdo_sync(
 */
 
 void ec_slave_sync_config(const ec_slave_t *slave, /**< EtherCAT slave */
-        const ec_sii_sync_t *sync, /**< sync manager */
+        const ec_sync_t *sync, /**< sync manager */
         uint8_t *data /**> configuration memory */
         )
 {
diff --git a/master/slave.h b/master/slave.h
index 32f3dc589cba683a52cc814f502434994c1034d5..36d497160bce88c75133a0817022d3912932f738 100644
--- a/master/slave.h
+++ b/master/slave.h
@@ -72,6 +72,11 @@ typedef enum
 }
 ec_slave_state_t;
 
+/*****************************************************************************/
+
+/**
+ */
+
 typedef enum {
     EC_SLAVE_OFFLINE,
     EC_SLAVE_ONLINE
@@ -97,7 +102,7 @@ enum
 /*****************************************************************************/
 
 /**
-   Sync manager configuration (EEPROM).
+   Sync manager.
 */
 
 typedef struct
@@ -107,11 +112,12 @@ typedef struct
     uint16_t length; /**< data length in bytes */
     uint8_t control_register; /**< control register value */
     uint8_t enable; /**< enable bit */
+
     uint16_t est_length; /**< Estimated length. This is no field of the SII,
                             but it is used to calculate the length via
                             PDO ranges */
 }
-ec_sii_sync_t;
+ec_sync_t;
 
 /*****************************************************************************/
 
@@ -169,7 +175,7 @@ typedef struct
 {
     unsigned int index; /**< FMMU index */
     const ec_domain_t *domain; /**< domain */
-    const ec_sii_sync_t *sync; /**< sync manager */
+    const ec_sync_t *sync; /**< sync manager */
     uint32_t logical_start_address; /**< logical start address */
 }
 ec_fmmu_t;
@@ -228,7 +234,7 @@ struct ec_slave
     uint8_t sii_physical_layer[4]; /**< port media */
     char **sii_strings; /**< strings in EEPROM categories */
     unsigned int sii_string_count; /**< number of EEPROM strings */
-    ec_sii_sync_t *sii_syncs; /**< EEPROM SYNC MANAGER categories */
+    ec_sync_t *sii_syncs; /**< EEPROM SYNC MANAGER categories */
     unsigned int sii_sync_count; /**< number of sync managers in EEPROM */
     struct list_head sii_pdos; /**< EEPROM [RT]XPDO categories */
     char *sii_group; /**< slave group acc. to EEPROM */
@@ -256,7 +262,7 @@ void ec_slave_destroy(ec_slave_t *);
 void ec_slave_reset(ec_slave_t *);
 
 int ec_slave_prepare_fmmu(ec_slave_t *, const ec_domain_t *,
-                          const ec_sii_sync_t *);
+        const ec_sync_t *);
 
 void ec_slave_request_state(ec_slave_t *, ec_slave_state_t);
 void ec_slave_set_state(ec_slave_t *, ec_slave_state_t);
@@ -270,11 +276,10 @@ int ec_slave_fetch_sii_pdos(ec_slave_t *, const uint8_t *, size_t,
         ec_pdo_type_t);
 
 // misc.
-ec_sii_sync_t *ec_slave_get_pdo_sync(ec_slave_t *, ec_direction_t); 
-void ec_slave_sync_config(const ec_slave_t *, const ec_sii_sync_t *,
-        uint8_t *);
+ec_sync_t *ec_slave_get_pdo_sync(ec_slave_t *, ec_direction_t); 
+void ec_slave_sync_config(const ec_slave_t *, const ec_sync_t *, uint8_t *);
 void ec_slave_fmmu_config(const ec_slave_t *, const ec_fmmu_t *, uint8_t *);
-uint16_t ec_slave_calc_sync_size(const ec_slave_t *, const ec_sii_sync_t *);
+uint16_t ec_slave_calc_sync_size(const ec_slave_t *, const ec_sync_t *);
 
 int ec_slave_is_coupler(const ec_slave_t *);