Non-AIS Generation. The first H1-H2 byte pair is transmitted as a normal pointer with:

•NDF = 0110

•SS (SONET/SDH) = 0

•Pointer Value = 10_0000_1010

All other H1-H2 byte pairs are transmitted as concatenation indi- cation bytes, with

 

 

NEW DATA FLAG (NOF)

SS BITS

 

 

 

 

 

 

 

10--BIT POINTER VALUE

 

 

 

 

 

 

 

 

 

N

 

N

 

N

 

N

S

 

S

I

 

D

 

I

 

 

D

 

I

 

D

 

I

 

D

 

I

 

D

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BIT

 

1

2

3

4

5

6

7

8

 

1

2

3

4

 

5

6

7

8

 

 

 

 

 

 

 

 

MSB

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LSB

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H1 BYTE

 

 

 

 

 

 

 

 

 

 

 

 

 

H2 BYTE

 

 

 

 

 

 

 

 

 

NDF DISABLED: 0110

 

 

 

 

 

 

 

 

POSITIVE STUFF: INVERT 5 I-BITS

 

 

 

 

 

 

 

NDF ENABLED: 1001

 

 

 

 

 

 

 

 

NEGATIVE STUFF: INVERT 5 D-BITS

 

 

 

 

 

•NDF =1001

•SS = 0

•Pointer Value = 11_1111_1111. See Figure 14.

3.9.3.3.9Line/MS BIP-24 (B2)

There are three B2 bytes in the TOH/SOH, and together they pro- vide a BIP-24 error detection capability. Each B2 byte provides BIP-8 parity over bytes in one of three groups of bytes in the previ- ous frame. The B2 byte in column j provides BIP-8 parity over bytes in the previous frame (except those in the first three rows of TOH/SOH) that appear in columns j + 3k, where k = 0 through 89 and j = 0 through 2. The BIP-8 is trans- mitted as even parity (normal) if B2_INV = 0. Otherwise, odd parity (incorrect) is generated. The BIP- 8 values are calculated over bytes in the previous STS-3c/STM-1 frame before scrambling and placed into the B2 bytes of the current frame before scrambling.

3.9.3.3.10APS Channel and Line/MS AIS/RDI (K1 and K2)

K1 and the five MSBs of K2 are used for automatic protection switching (APS) signaling. The three LSBs of K2 are used as an AIS or Remote Defect Indication (RDI) at the line/MS level. In SONET, they are also used for APS signalling. The HDMP-3001 inserts TX_K1[7:0] in the transmit- ted K1 bytes and TX_K2[7:3] in

Figure 14. Pointer Byte Fields

the transmitted five MSBs of K2 bytes.

The three LSBs of K2 are con- trolled from three sources. In order of priority, these are

•if TX_LAIS = 1, the bits are transmitted as all ones (as are all line/MS overhead bytes) indicating LAIS.

•if bits 6 to 8 of received K2 are 111, the three LSBs of the transmit K2 are transmitted as all ones indicating LRDI.

•if LRDI_INH = 0 and if any of (RX_LOS AND NOT RX_LOS_INH), RX_LOF and RX_LAIS =1, the bits are transmitted as 110 indicating LRDI. Any time this particular event is active, the three LSBs of K2 are set to 110 for a minimum of 20 frames.

•otherwise TX_K2[2:0] is transmitted.

RX_LOS can be active high (RX_LOS_LEVEL = 0, the default) or active low (RX_LOS_LEVEL = 1).

The requirements R6-180 through R6-182 of GR-253 specify that RDI should be inserted and removed within 125 ∝ s of detection and re- moval of received LOS, LOF, or LAIS.

3.9.3.3.11Synchronization Status (S1)

The four LSBs of this byte convey synchronization status messages. The transmitted S1 byte is set equal to TX_S1[7:0].

3.9.3.3.12Line/MS REI (M1)

The Receive Side monitors B2 bit errors in the received signal. The number of B2 errors detected in each frame can range from 0 to 24 B2 bits. The line/MS Remote Error Indication (REI) byte, the M1 byte, normally conveys the count of B2 errors detected in the re- ceived signal.

If LREI_INH = 0, the M1 byte is set equal to the most recent B2 error count. Otherwise, the M1 byte is set to all zeros.

3.9.3.3.13Growth/Undefined (Z1 and Z2)

The use of the Z1 and Z2 bytes is not standardized. The HDMP-3001 fills these bytes with all zeros.

3.9.3.4 Scrambling

The input is scrambled with a frame synchronous scrambling sequence generated from the polynomial X7 +X6 +1. The scram- bler is initialized to 1111111 at the beginning of the first SPE/VC byte (the byte in column 10 of row 1 in STS-3c/STM-1 mode), and it

29

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Agilent Technologies HDMP-3001 Line/MS BIP-24 B2, APS Channel and Line/MS AIS/RDI K1 and K2, Synchronization Status S1
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HDMP-3001 specifications

Agilent Technologies, a prominent name in electronics and measurement technology, offers a wide range of products that cater to various industries. Among its notable offerings is the HDMP-3001, a high-speed, serial data transceiver designed to facilitate robust communications in electronic systems. The HDMP-3001 stands out with its ability to handle high bandwidths, making it particularly suited for applications requiring rapid data transfer, such as telecommunications, computer networking, and high-performance computing.

One of the main features of the HDMP-3001 is its advanced signaling technology. By employing differential signaling, the transceiver minimizes electromagnetic interference and enhances signal integrity. This is crucial in environments with multiple electronic devices operating simultaneously, as it ensures data is transmitted clearly and without degradation.

The HDMP-3001 operates at a maximum data rate of 1 Gbps, allowing for efficient data transfer over short distances. This capability is coupled with a flexible architecture that enables users to configure the transceiver for various applications. The device supports both point-to-point and point-to-multipoint configurations, giving engineers the versatility they need in designing communication links.

Moreover, the HDMP-3001 features on-chip clock recovery functionality, which simplifies system design by reducing the number of external components needed. This built-in feature allows the transceiver to maintain synchronization even as data rates increase, further enhancing performance.

The low power consumption characteristic of the HDMP-3001 is another notable advantage. This makes it an attractive choice for battery-operated devices and systems where power efficiency is critical. The transceiver’s design ensures optimal performance while minimizing heat generation and power draw, enabling longer operational lifetimes.

In terms of physical characteristics, the HDMP-3001 comes in a compact, surface-mount package, allowing for easier integration into various circuit board designs. The small form factor, combined with its innovative technology, makes it a popular choice among engineers seeking to improve data transmission reliability without compromising on space or power constraints.

Overall, Agilent Technologies' HDMP-3001 is a formidable solution for high-speed serial data transmission, characterized by its robust performance, low power consumption, and versatile configuration options. With these features, it continues to be an essential component in the evolving landscape of electronic communications.
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