configuration.adoc: Small fixes
Fix some typos, correct data compression command, add example to turn off compression. Change-Id: I6beff8c66eacf12f1081d51dd6b124bdd4478558 Related: OS#1720
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@ -7,7 +7,7 @@ On the one hand, this is primary because the PCU configuration happens
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from the BSC side.
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On the other hand, it is because the Gb interface does not need an
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explicit configuration of all each PCU connecting to the SGSN. The
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explicit configuration of each PCU connecting to the SGSN. The
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administrator only has to ensure that the NS and BSSGP layer identities
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(NSEI, NSVCI, BVCI) are unique for each PCU connecting to the SGSN.
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@ -17,7 +17,7 @@ The Gp interface is the GTP-C and GTP-U based interface between the SGSN
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and the GGSNs. It is implemented via UDP on well-known source and
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destination ports.
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When a MS requests establishment of a PDP context, it specifies the APN
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When an MS requests establishment of a PDP context, it specifies the APN
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(Access Point Name) to which the context shall be established. This APN
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determines which GGSN shall be used, and that in turn determines which
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external IP network the MS will be connected to.
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@ -100,7 +100,7 @@ NOTE: The policy mode *closed* must not be confused with the equally named
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policy that is defined for osmo-nitb!
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.Example: Assign or change authorization policy:
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.Example: Assign or change authorization policy
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----
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OsmoSGSN> enable
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OsmoSGSN# configure terminal
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@ -116,7 +116,7 @@ OsmoSGSN>
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<2> Saves current changes to cofiguration to make this policy
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persistent
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.Example: Access control list:
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.Example: Access control list
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----
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sgsn
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auth-policy acl-only <1>
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@ -153,7 +153,7 @@ simplified by use of a binary TLV encoding similar to Layer 3 of
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GSM/GPRS.
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GSUP performs a challenge-response authentication protocol called OAP,
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which uses the standard MILEAGE algorithm for mutual authentication
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which uses the standard MILENAGE algorithm for mutual authentication
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between OsmoSGSN and the HLR/HLR-GW.
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[[sgsn-ex-gsup]]
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@ -251,9 +251,8 @@ _pdp-_), then the following extra CSV fields are appended to the line:
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=== User traffic compression
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In order to save optimize GPRS bandwith, OsmoSGSN implements header and data
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compression schemes. The compression will reduce the packet length in order
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to save radio bandwith.
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In order to save GPRS bandwith, OsmoSGSN implements header and data
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compression schemes which will reduce the packet length.
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==== Header compression
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@ -278,18 +277,24 @@ actively request different compression parameters or reject the offered
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compression parameters entirely. The number of slots is the maximum number
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of packet headers per subscriber that can be stored in the codebook.
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.Example: Accept compression if requested:
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.Example: Accept compression if requested
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----
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sgsn
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compression rfc1144 passive
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----
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.Example: Actively promote compression:
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.Example: Actively promote compression
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----
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sgsn
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compression rfc1144 active slots 8
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----
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.Example: Turn off compression
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----
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sgsn
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no compression rfc1144
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----
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NOTE: The usage of TCP/IP options may disturb the RFC1144 header compression
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scheme. TCP/IP options may render RFC1144 ineffective if variable data is
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encoded into the option section of the TCP/IP packet. (e.g. TCP option 8,
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@ -299,10 +304,10 @@ Timestamp)
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==== Data compression
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Data compression works on the raw packet data, including the header part of the
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packet. If enabled, header compression is applied before first data compression
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packet. If enabled, header compression is applied first before data compression
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is applied. OsmoSGSN implements the V.42bis data compression scheme.
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*compression rfc1144 passive*::
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*compression v42bis passive*::
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V42bis data compression has to be actively requested by the modem. The network
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will not promote compression by itself. This is the recommended mode of
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operation.
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@ -316,14 +321,20 @@ directions will be the preferred option. The following to parameters configure
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the codebook size by the maxium number ('codewords') and size ('strlen') of
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entries.
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.Example: Accept compression if requested:
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.Example: Accept compression if requested
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----
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sgsn
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compression v42bis passive
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----
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.Example: Actively promote compression:
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.Example: Actively promote compression
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----
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sgsn
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compression v42bis active direction both codewords 512 strlen 20
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----
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.Example: Turn off compression
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----
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sgsn
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no compression v42bis
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----
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