參數資料
型號: TMUX03155
英文描述: TMUX03155 STS-3/STM-1 (AU-4) Multiplexer/Demultiplexer
中文描述: TMUX03155 STS-3/STM-1(非盟- 4)復用器/解復用器
文件頁數: 25/120頁
文件大?。?/td> 1542K
代理商: TMUX03155
Agere Systems Inc.
25
Data Sheet
April 2001
TMUX03155 STS-3/STM-1 (AU-4) Multiplexer/Demultiplexer
Receive Direction Overview
(continued)
Loopback Select Logic
The device can be configured to loopback the transmit STS-3/STM-1 (AU-4) (
THS2RHSLB
= 1
, 0x55
) or accept
the local STS-3/STM-1 (AU-4) signal (
THS2RHSLB
= 0). While in the loopback mode, the
RHSOOF
,
RHSLOF
,
and
RHSLOS
(
0x1B
) state bits are inhibited from causing an alarm indication signal (AIS) from being generated on
the STS1/AU-3 output signals.
RSTS-3/STM-1 (AU-4) Frame Synchronous Descrambling (SONET/SDH)
The device will descramble the received SONET/SDH data (minus the first row of SOH) according to the frame
synchronous descrambling polynomial; specifically: f(x) = 1 + x
6
+ x
7
. Under software control, frame descrambling
can be disabled (
RHSDSCR
= 1
, 0x55
).
TOAC Drop
This channel drops all of the transport overhead bytes from the STS-3/STM-1 (AU-4) signal. (See RTOAC in the
Maintenance Functions section, page 44, for more details (RTOACCLKO, RTOACSYNCO, RTOACDATAO)).
B1, B2, and B3 Checking
The device will monitor the incoming B1, B2, and B3 values for errors. The error counts will be latched when the
LATCH_CNT
signal transitions from a low to a high (
RHSB1ECNT[15:0]
,
RHSB2ECNT[17:0]
,
RHSB3ECNT[3—1][15:0], Page 1 - 0x8D—0x8E, Page 1 - 0x8F—0x91, Page 1 - 0x92—0x97
). These counters
will either count bit or block errors (
BITBLOCKCNT, 0x34
).
Monitoring Functions
The following transport overhead and path overhead bytes are monitored for failures or changes in states ((J0,
Z0-2, Z0-3, F1, K1K2 (APS bytes), S1, M1), (J1,C2, G1, F2, H4, Z3, Z5)). The bit error rate of the incoming STS-3/
STM-1 (AU-4) signal is calculated to create signal fail
and signal degrade
indicators. (See Maintenance Functions
Disabled During Failure Conditions in the Maintenance Functions section, page 28, for more details.)
Pointer Interpretation
The device will evaluate the current pointer state for the normal state, Path AIS (PAIS) state, or loss-of-pointer
(LOP) conditions, as well as pointer increments and decrements (that are counted in
RPTR_INC[3—1][10:0]
and
RPTR_DEC[3—1][10:0]
counters (
0x98—0xA3
), respectively). The current pointer state (
RLOP[3—1
],
RPAIS[3—1], 0x1C
) and any changes in pointer condition (
RLOPD[3—1]
,
RLOPM[3—1]
,
RPAISD[3—1]
,
RPAISM[3—1], 0x0B, 0x14
), are reported to the control system. When the device is receiving a concatenated sig-
nal (STM-1(AU-3)), the
RCONCATMODE, 0x55
bit must be set for the concatenation state machines
(
CONCAT_STATE[3—2][1:0], 0x1C, 0x1D
) on ports 2 and 3 to contribute to pointer evaluation.
This state machine implements the pointer interpretation algorithm described in ETS 300 417-1-1: January 1996 -
Annex B.
The number of consecutive conditions for invalid pointer and invalid concatenation indication are programmable
with a range 8—10 (
CNTCIP_ICI[1:0], 0x5F
).
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