From 07be4a9976b1d237d6c19dcf48bee7b6d0db6516 Mon Sep 17 00:00:00 2001
From: Josh Blum <josh@joshknows.com>
Date: Mon, 29 Aug 2011 18:03:27 -0700
Subject: uhd: fixed formatting on gpsdo doc, added time sync docs on mimo
 cable

---
 host/docs/gpsdo.rst | 18 +++++++++++++-----
 host/docs/sync.rst  | 13 +++++++++++--
 2 files changed, 24 insertions(+), 7 deletions(-)

(limited to 'host/docs')

diff --git a/host/docs/gpsdo.rst b/host/docs/gpsdo.rst
index a0f2d67da..5680e0699 100644
--- a/host/docs/gpsdo.rst
+++ b/host/docs/gpsdo.rst
@@ -11,11 +11,17 @@ to the Jackson Labs Firefly-1A device unless noted otherwise.
 ------------------------------------------------------------------------
 Specifications
 ------------------------------------------------------------------------
-Receiver type: 50 channel with WAAS, EGNOS, MSAS
-10MHz ADEV: 1e-11 over >24h
-1PPS RMS jitter: <50ns 1-sigma
-Holdover: <11us over 3h
-Phase noise: 1Hz: -80dBc/Hz, 10Hz: -110dBc/Hz, 100Hz: -135dBc/Hz, 1kHz: -145dBc/Hz, 10kHz: <-145dBc/Hz
+* Receiver type: 50 channel with WAAS, EGNOS, MSAS
+* 10MHz ADEV: 1e-11 over >24h
+* 1PPS RMS jitter: <50ns 1-sigma
+* Holdover: <11us over 3h
+* Phase noise:
+
+  * **1Hz:** -80dBc/Hz
+  * **10Hz:** -110dBc/Hz
+  * **100Hz:** -135dBc/Hz
+  * **1kHz:** -145dBc/Hz
+  * **10kHz:** <-145dBc/Hz
 
 ------------------------------------------------------------------------
 Installation
@@ -35,6 +41,7 @@ To configure the USRP to communicate with the GPSDO, use the
 usrp_burn_mb_eeprom utility:
 
 ::
+
    $ cd <install-path>/share/uhd/utils
    $ ./usrp_burn_mb_eeprom --key=gpsdo --val=internal
 
@@ -53,6 +60,7 @@ GPS data is obtained through the mboard_sensors interface. To retrieve
 the current GPS time, use the "gps_time" sensor:
 
 ::
+
     usrp->get_mboard_sensor("gps_time");
 
 The returned value will be the current epoch time, in seconds since
diff --git a/host/docs/sync.rst b/host/docs/sync.rst
index fe37a66dd..fb9f7a1df 100644
--- a/host/docs/sync.rst
+++ b/host/docs/sync.rst
@@ -105,8 +105,17 @@ and the user can also parse this string to determine GPS time:
 Method 3 - internal GPSDO
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 USRPs with internal GPSDOs properly configured will automatically
-configure themselves to set the VITA time to current UTC time. See the
-GPSDO application note for more details.
+configure themselves to set the VITA time to current UTC time.
+See the `GPSDO Application Notes <./gpsdo.html>`_ for more details.
+
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+Method 4 - MIMO cable
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+A USRP can synchronize its time to another USRP via the MIMO cable.
+Unlike the other methods, this does not use a real "pulse per second".
+Rather, the USRP sends an encoded time message over the MIMO cable.
+The slave device will automatically synchronize to the time on the master device.
+See the `MIMO Cable Application Notes <./usrp2.html#using-the-mimo-cable>`_ for more detail.
 
 ------------------------------------------------------------------------
 Synchronizing channel phase
-- 
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