363-206-285
Administration and Provisioning
Issue 3 June 2001
8-47
T1/TMUX Cross Connection and Description 8
Starting with OC-3 Release 15.0, the T1EXT (BBF6) (used only with the
enhanced MXRVO BBG2B- circuit pack) is supported.
The dual T1EXT circuit pack terminates up to two bi-directional T1 line interfaces,
supporting the transport of a DS1 signal. The T1EXT supplies 60 mA simplex DC
line power for each of the two T1 lines. Signals received from the T1 interface are
mapped into SONET VT1.5 signals. The resulting signals are routed to the OLIU
circuit pack.
The BBF6 circuit pack offers DS1 path performance monitoring (PM) equivalent to
that provided by the BBF3-type DS1 circuit pack. DS1 PM is performed to collect,
store, threshold and generate PM reports on Errored Seconds (ES), daily counts
for Super-Frame-NearEnd (SF-NE), Extended SuperFrame-NearEnd (ESF-NE)
and Extented SuperFrame-FarEnd (ESF-FE).
Configurations Supported 8
OC-3 Release 15.0 adds support for T1 extensions. Each BBF6 circuit pack can
support 2 T1 extensions; These can be mixed with DS1 (BBF1,BBF1B,BBF3 or
BBF3B), BBF8 HDSL, or (BBF9/BBF10) IMA LAN Low Speed circuit packs.
The Low Speed slot "ls-{a,b,c}-8" position is the protection slot for all other slots
equipped with packs of a kind it can protect. A shelf with BBF6s in every Low
Speed slot of a certain group provides 14 T1 extensions. Furthermore, a BBF6
can only be used in an OC-3 shelf equipped with the enhanced MXRVO -BBG2B
(for Group 4 shelves) circuit packs in the corresponding Function Unit group.
Cross-Connection Changes on the T1EXT BBF6
Equipped Shelves 8
When a Function Unit group is equipped with BBG2B MXRVO circuit packs and
the corresponding Low Speed group is equipped with BBF6s in every Low Speed
slot, 14 T1 extensions are addressable. Those extensions are mapped to 14
VT1.5 signals.
DS1 Alarm Processing and Alarm Reports 8
DS1 alarms will be created and alarm reports available for the OC-3 shelves
equipped with T1EXT circuit packs in Low Speed slots Alarms for mixing packs in
the Low Speed slots will be covered as well.
CIT/TL1 commands for setting and retrieving this information are given later in this
document.
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