Change in osmo-gsm-manuals[master]: TRXD: generalize description of the 'RFU' ('PAD') field

[fixeria]

fixeria has submitted this change. ( https://gerrit.osmocom.org/c/osmo-gsm-manuals/+/23687 )

Change subject: TRXD: generalize description of the 'RFU' ('PAD') field
......................................................................

TRXD: generalize description of the 'RFU' ('PAD') field

This field will also appear in TRXDv2 packet diagrams, in several
places.  Let's rename it to 'RFU', because it's actually something
that may want to use in the future, rather than just padding.

Change-Id: I9ac9d387325627d18811fae1d0d7930b69f08129
Related: SYS#4895, OS#4941, OS#4006
---
M common/chapters/trx_if.adoc
1 file changed, 9 insertions(+), 10 deletions(-)

Approvals:
  pespin: Looks good to me, but someone else must approve
  osmith: Looks good to me, approved
  Jenkins Builder: Verified



diff --git a/common/chapters/trx_if.adoc b/common/chapters/trx_if.adoc
index 04da347..fb9e99f 100644
--- a/common/chapters/trx_if.adoc
+++ b/common/chapters/trx_if.adoc
@@ -405,7 +405,7 @@
 	node_height = 40
 
 	0-3:	VER(0)
-	4:	RES
+	4:	RFU
 	5-7:	TN
 	8-39:	FN
 	40-47:	RSSI
@@ -423,7 +423,7 @@
 	node_height = 40
 
 	0-3:	VER(1)
-	4:	RES
+	4:	RFU
 	5-7:	TN
 	8-39:	FN
 	40-47:	RSSI
@@ -442,7 +442,7 @@
 	node_height = 40
 
 	0-3:	VER(1)
-	4:	RES
+	4:	RFU
 	5-7:	TN
 	8-39:	FN
 	40-47:	RSSI
@@ -458,9 +458,9 @@
 TN: 3 bits::
 Timeslot number.
 
-RES: 1 bit::
-Reserved, shall be 0. It can be used in the future to extend the TDMA TN range
-to (0..15), in case anybody would need to transfer UMTS bursts.
+RFU: variable bit-length::
+Reserved for Future Use.  The sending side of the PDU shall set all bits to
+{bit-zero};  the receiving side shall ignore `RFU` fields.
 
 FN: 32 bits (4 bytes)::
 GSM frame number, big endian.
@@ -570,7 +570,7 @@
 	node_height = 40
 
 	0-3:	VER
-	4:	RES
+	4:	RFU
 	5-7:	TN
 	8-39:	FN
 	40-47:	PWR
@@ -584,9 +584,8 @@
 TN: 3 bits::
 Timeslot number.
 
-RES: 1 bit::
-Reserved, shall be 0. It can be used in the future to extend the TDMA TN range
-to (0..15), in case anybody would need to transfer UMTS bursts.
+RFU: variable bit-length::
+Reserved for Future Use, all bits shall be set to low (`0`).
 
 FN: 32 bits (4 bytes)::
 GSM frame number, big endian.

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Gerrit-Project: osmo-gsm-manuals
Gerrit-Branch: master
Gerrit-Change-Id: I9ac9d387325627d18811fae1d0d7930b69f08129
Gerrit-Change-Number: 23687
Gerrit-PatchSet: 4
Gerrit-Owner: fixeria <vyanitskiy at sysmocom.de>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: fixeria <vyanitskiy at sysmocom.de>
Gerrit-Reviewer: laforge <laforge at osmocom.org>
Gerrit-Reviewer: osmith <osmith at sysmocom.de>
Gerrit-Reviewer: pespin <pespin at sysmocom.de>
Gerrit-MessageType: merged
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