diff --git a/src/ericsson-rbs/er_ccu_descr.h b/src/ericsson-rbs/er_ccu_descr.h
new file mode 100644
index 0000000..0b56cc0
--- /dev/null
+++ b/src/ericsson-rbs/er_ccu_descr.h
@@ -0,0 +1,49 @@
+#pragma once
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <osmocom/abis/e1_input.h>
+#include <osmocom/trau/trau_pcu_ericsson.h>
+
+struct er_ccu_descr;
+struct e1_conn_pars;
+typedef void (er_ccu_empty) (struct er_ccu_descr *ccu_descr);
+typedef void (er_ccu_rx) (struct er_ccu_descr *ccu_descr, const ubit_t *bits, unsigned int num_bits);
+
+struct er_ccu_descr {
+
+	/* E1-line and timeslot (filled in by user) */
+	struct e1_conn_pars *e1_conn_pars;
+
+	/* Callback functions (provided by user) */
+	er_ccu_empty *er_ccu_empty_cb;
+	er_ccu_rx *er_ccu_rx_cb;
+
+	/* I.460 Subslot */
+	struct {
+		struct osmo_i460_schan_desc scd;
+		struct osmo_i460_subchan *schan;
+		struct osmo_fsm_inst *trau_sync_fi;
+		bool ccu_connected;
+	} link;
+
+	/* TRAU Sync state */
+	struct {
+		uint32_t pseq_ccu; /* CCU sequence counter (remote) */
+		uint32_t pseq_pcu; /* PCU sequence counter (local) */
+		uint32_t last_afn_ul; /* Adjusted frame number, uplink */
+		uint32_t last_afn_dl; /* Adjusted frame number, downlink */
+		enum time_adj_val tav; /* Last time adjustment value */
+		bool ul_frame_err; /* True when last uplink TRAU frame was bad */
+		bool ccu_synced; /* True when PCU is in sync with CCU */
+	} sync;
+
+	/* PCU related context */
+	struct {
+		uint8_t trx_no;
+		uint8_t bts_nr;
+		uint8_t ts;
+	} pcu;
+
+
+};