NEC UPD98413 User Manual page 44

(a) OH insert register setting
The µ PD98413 has an insert register that sets an arbitrary value in the following byte areas of the overhead
for transmission. By setting this insert register via the management interface, any value can be transmitted.
Until a value is set in the register, the default value of the register is transmitted. For details of the OH insert
register, see Section 3.5 .
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OH byte having insert register
TOH: K1, K2, E1, E2, F1, D1 through D3, D4 through D12, J0, S1, 1st Z2
POH: J1, C2, F2, G1(bits 5 to 8), H4, Z3, Z4, Z5
Of these, the internal alarm processing of the µ PD98413 takes precedence over K2 and G1 bytes if the
µ PD98413 must transmit an alarm.
(b) OH insert interface
The µ PD98413 has an insert interface that is used to set the contents of the OH byte of the transmit TOH
and POH from a peripheral device. These bytes can be input to all the OH bytes, except the following ten
bytes.
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OH bytes that cannot be changed: A1, A2, B1, B2, B3, H1, H2, H3, G1 (bits 1 to 4), M1
(These ten bytes can be input at some timing but, even if they are input, data cannot be changed to these
bytes because the µ PD98413 internally overwrites these bytes for output).
(c) Section and Line DCC insert interface
The µ PD98413 has an input interface that is used to set the contents of the Section and Line DCC from a
peripheral device. D1 through D3 bytes can be inserted from the Section DCC insert interface, and D4
through D12 bytes can be inserted from the Line DCC insert interface.
(d) Setting of J0 and J1 trace message
A trace message of 16 or 64 bytes can be set and transmitted to the J0 byte of SOH and J1 byte of POH.
J0: Section trace message
J1: Path trace message
The transmit message is set to an internal buffer of the µ PD98413 via management interface. When a
command is executed, the µ PD98413 sets each byte of the message at the positions of the J0 and J1 bytes
for transmission.
(3) Scramble of frame
The frame to be transmitted is scrambled by using the following polynomial expression. Scramble is performed
for the bytes in the entire range, except a total 36 bytes of "A1, A2, J0 and Z0".
Polynomial G (X) = 1 + X
The user can select a scramble stop mode for the purpose of testing. The scramble stop mode is selected by the
FSCM bit of the MDSOHT register.
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CHAPTER 3 FUNCTIONAL OUTLINE
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PRELIMINARY
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