
Preliminary Data Sheet, Rev. 1
October 2000
TMXF28155 Super Mapper
155/51 Mbits/s SONET/SDH x28/x21 DS1/E1
437
Lucent Technologies Inc.
28-Channel Framer Block Functional Description
(continued)
Facility Data Link
(continued)
Transmit ESF Data Link Bit-Oriented Messages
n
Provides capability to transmit bit-oriented messages.
When enabled through a configuration bit (FRM_BOME (Table 448)), bit-oriented messages will be transmitted on
the data link channel of the frame bit for ESF links. The ESF superframe is numbered 1 through 24 with the data
link channel transmitted in the odd numbered frames (4 kbits/s).
The BOM is a 16-bit message defining an alarm or command and response action, and sent repeatedly for a
period of time determined by the event. The message consists of eight 1s, a 0, a 6-bit code to identify the alarm or
action, and a 0 (1111_1111_0 in front and 0 behind the 6-bit code).
The message can occur at any point in the extended superframe without respect to boundaries. The exact mes-
sage to be sent will reflect what has been programmed into a register (FRM_TBOM{5:0] (Table 448) bits). The
BOM format is as follows:
0 X X X _ X X X 0 _ 1111_1111: (right-most bit being transmitted first).
When the BOM pattern is enabled, it will be transmitted until disabled. When disabled, the pattern will cease to be
transmitted immediately.
A BOM status bit will indicate when the pattern has been sent 10 times. That status bit will be reset on read.
When enabled using the FRM_ASRC (Table 447) bit, the BOMs should only be inserted when the proper align-
ment has been reached. For ESF links, both BFA and MFA are required for insertion. This condition effects the
insertion of BOMs bits and the reporting of stack empty to the host.
CEPT, CEPT Multiframe Transmit Data Link Sa bits Stack
n
Provides two multiframes of Sa-bit storage for transmission on CEPT links.
n
Provides interrupt for stack empty.
n
Performs retransmission of stack when update has yet to be performed.
n
Provides capability to source Sa bits from blocks other than the data link block.
n
Provides host access to stack using processor clock to provide fast access.
This block will always present the Sa bits stored in the Tx stack to the TDM data stream. The data valid signal will
reflect the programming of the Sa source control bits (FRM_SA4SC—FRM_SA8SC (Table 447)). In CEPT, the Sa
bits are located in time slot 0 of the NOTFAS frames (odd numbered frames). CEPT multiframe format frames are
numbered 0 through 15 with the Sa bits located in time slot 0 of the odd numbered frames (NOTFAS frames).