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+What this talk is about
+TE
+ + |
+
+ +Terminal Equipment (Phone, Modem, …) + + |
+
+NT
+ + |
+
+ +[ISDN] Network Termination (e.g. NTBA in Germany) + + |
+
+ISDN
+ + |
+
+ +Integrated Services Digital Network + + |
+
+PSTN
+ + |
+
+ +Public Switched Telephony Network + + |
+
+BRA
+ + |
+
+ +Basic Rate (ISDN) Access (2x 64k B-Channels) + + |
+
+PRA
+ + |
+
+ +Primary Rate (ISDN) Access (30x 64k B-Channels) + + |
+
+E1
+ + |
+
+ +Primary Rate interface, 2048 kBps + + |
+
This creates the problem of managing a vast amount of subscriber line wiring
Response: Modular architecture
Vendors came up with their respective proprietary access multiplexers.
ETSI V5 is the attempt to replace vendor proprietary access multiplexers with an interoperable, +standards-based system.
V5 disaggregates the telephone exchange into two parts:
The E1 based V5 interface can of course be carried over higher-order PDH/SDH
+AN
+ + |
+
+ +Access Network + + |
+
+LE
+ + |
+
+ +Local Exchange + + |
+
+FE
+ + |
+
+ +Functional Element + + |
+
+LT
+ + |
+
+ +Line Termination + + |
+
+LC
+ + |
+
+ +Line Circuit + + |
+
+ET
+ + |
+
+ +Exchange Termination + + |
+
As ISDN already has digital signaling (Q.921/Q.931), no need for any V5 specific ISDN protocol (like PSTN +protocol). Signaling from user is relayed to LE via V5 (and vice-versa).
V5.2 introduces the following major changes:
The new features are added in a backwards compatible manner
All of the V5.1 related specs plus the following new ones:
+ +
+ +
+ +
+ +
+ +
Keymile MileGate is a combined POTS/ISDN/DSL subscriber access platform
Waiting for actual V5 AN equipment to start testing it.
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