Filter
Top Products
27
PRDI_AUTO PRDI_ENH RX_PAIS RX_UNEQ RX_PLM G1 Bits 5, 6, and 7
RX_LOP
0 x x x x TX_G1[2:0]
101 x x 100
0x x000
1 1 x x 101
01 x110
00 1010
00 0001
Table 11. Path RDI bit values
3.9.3.2.9 POH AIS Generation
Normal generation of SONET/
SDH payload is suspended during
transmission of the Line (Multi-
plex Section or MS) Alarm
Indication Signal, LAIS, or the
Path (Administrative Unit or AU)
AIS signals, PAIS. AIS is gener-
ated if:
• TX_LAIS or TX_PAIS = 1. In
addition the entire payload
(9396 or 2349 bytes) is filled
with all ones.
• LOF is detected.
• Bits 6 - 8 of K2 are all ones.
• The pointer bytes H1, H2 are
all ones.
3.9.3.2.10 Unequipped Generation
Unless AIS is active, unequipped
SPE/VC (all SPE/VC bytes are
filled with all zeros) is generated
if TX_UNEQ = 1.
3.9.3.3 TOH/SOH Generation
The SONET TOH bytes are gener-
ally the same as the SDH SOH
bytes. The following sections de-
fine the values generated for all
TOH/SOH bytes. Where the byte
names differ between SONET and
SDH, the SONET names are listed
first. Entries that are blank in
Table 15 are SONET undefined or
SDH non-standardized reserved
bytes. The HDMP-3001 fills these
bytes with all zeros. The Z1 and
Z2 bytes are non-standardized re-
served bytes for STM-1.
3.9.3.3.1 TOH/SOH AIS Generation
Normal generation of TOH/SOH
bytes is suspended during trans-
mission of LAIS or PAIS. If
TX_LAIS = 1, the first three rows
of the TOH/SOH are generated
normally, but the remainder of the
TOH/SOH as well as all SPE/VC
bytes are transmitted as all ones
bytes. If TX_PAIS = 1, all rows of
the TOH/SOH are generated nor-
mally, except for the pointer bytes
in row four. The H1, H2, and H3
bytes as well as all SPE/VC bytes
are transmitted as all ones.
3.9.3.3.2 Frame Bytes (A1 and A2)
The frame bytes are normally gen-
erated with the fixed patterns:
• A1: 1111_0110 = F6
• A2: 0010_1000 = 28
3.9.3.3.3 Section Trace/Regenerator
Section Trace (J0)
Over periods of 16 consecutive
frames, the HDMP-3001 continu-
ously transmits the 16-byte
pattern contained in
TX_J0[15:0]_[7:0]. The bytes are
transmitted in descending order
starting with TX_J0[15]_[7:0].
The ITU-T G.707 standard states
that a 16-byte section trace frame
containing the Section Access
Point Identifier (SAPI) defined in
clause3/G.831 should be transmit-
ted continuously in consecutive
J0 bytes. Note that only the frame
start marker byte should contain a
one in its MSB.
The Section Trace function is not
currently defined for SONET. Un-
less a similar section trace is
defined for SONET, all of the
TX_J0 bytes should be filled with
0000_0001 so that a decimal one is
transmitted continuously in J0.