DS26521 datasheet(14/258 Pages) MAXIM

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DS26521 Single T1/E1/J1 Transceiver

14 of 258

SPECIFICATIONS COMPLIANCE

The DS26521 LIU meets all the latest relevant telecommunications specifications. Table 4-1 and Table 4-2 provide

the T1 and E1 specifications and relevant sections that are applicable to the DS26521.

Table 4-1. T1-Related Telecommunications Specifications

ANSI T1.102: Digital Hierarchy Electrical Interface

AMI Coding

B8ZS Substitution Definition

DS1 Electrical Interface. Line rate

±32ppm; Pulse Amplitude between 2.4V to 3.6V peak; power level between

12.6dBm to 17.9dBm. The T1 pulse mask is provided that we comply. DSX-1 for cross connects the return loss is

greater than -26dB. The DSX-1 cable is restricted up to 655 feet.

This specification also provides cable characteristics of DSX-Cross Connect cable—22 AVG cables of 1000 feet.

ANSI T1.231: Digital Hierarchy—Layer 1 in Service Performance Monitoring

BPV Error Definition; Excessive Zero Definition; LOS description; AIS definition.

ANSI T1.403: Network and Customer Installation Interface—DS1 Electrical Interface

Description of the Measurement of the T1 Characteristics—100

Ω. Pulse shape and template compliance

according to T1.102; power level 12.4dBm to 19.7dBm when all ones are transmitted.

LBO for the Customer Interface (CI) is specified as 0dB, -7.5dB, and -15dB. Line rate is

±32ppm. Pulse Amplitude

is 2.4V to 3.6V.

AIS generation as unframed all ones is defined.

The total cable attenuation is defined as 22dB. The DS26521 functions with up to -36dB cable loss.

Note that the pulse template defined by T1.403 and T1.102 are different, specifically at Times 0.61, -0.27, -34, and

0.77. The DS26521 is compliant to both templates.

Pub 62411

This specification has tighter jitter tolerance and transfer characteristics than other specifications.

The jitter transfer characteristics are tighter than G.736 and jitter tolerance is tighter the G.823.

(ANSI) “Digital Hierarchy—Electrical Interfaces”

(ANSI) “Digital Hierarchy—Formats Specification”

(ANSI) “Digital Hierarchy—Layer 1 In-Service Digital Transmission Performance Monitoring”

(ANSI) “Network and Customer Installation Interfaces—DS1 Electrical Interface”

(AT&T) “Requirements for Interfacing Digital Terminal Equipment to Services Employing the Extended Super

Frame Format”

(AT&T) “High Capacity Digital Service Channel Interface Specification”

(TTC) “Frame Structures on Primary and Secondary Hierarchical Digital Interfaces”

(TTC) “ISDN Primary Rate User-Network Interface Layer 1 Specification”

DS26521 데이터시트(PDF) 14 Page - Maxim Integrated Products