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3.2.2  System Configuration

The default System Configuration menu looks like this:

The System Configuration options are described below:

Line Format: ESF

(default)

Options:  ESF, D4, UNFRAMED

D4: This is an older, but widely used, line format that does not

provide FDL, so network interface performance cannot be
monitored so easily. AT&T TR 62411 contains the specifica-
tions for this format and the ESF.  D4 is also known as
Superframe format. According to TR 62411, “The Superframe
format…consists of 12 frames of 193 bits each for a total of
2316 bits. Each 193 bit frame consists of 192 bits preceded
by one framing bit….the framing bit is time shared to both
synchronize the terminal equipment and to identify the signal-
ing frames.” (Sec. 4.1.1)

ESF: This stands for Extended Superframe Format, a line format

developed by AT&T. AT&T Technical Reference 54016 (TR
54016) defines the ESF, a format which is commonly used to
allow monitoring of the network interface performance over
the Facility Data Link (FDL). AT&T TR 62411 says, “the
Extended Superframe Format “extends” the DS1 superframe
structure from 12 to 24 frames…for a total of 4632 bits. It
redefines the 8 kb/s channel previously used exclusively for
terminal and robbed bit signaling synchronization.” The ESF
provides a 4 kb/s data link, called the FDL, which allows for
in-service monitoring and fast troubleshooting. Certain net-
work services require the ESF.

UNFRAMED:This is a special mode that allows you to achieve the

maximum possible data rate of 1.544 Mb/s (million bits per
second) by using the framing bits for data transmission. There
is no signaling or FDL. This is commonly used for campus
connections, and by the Federal government and the military.
This format is not to be used when connecting to a public car-
rier’s network without its permission. This provides one chan-
nel at a rate of 1.544 Mb/s. In addition, this format can be
used with external clocking.

Line Coding:  B8ZS

(default)

Options:  AMI, B8ZS, B7ZS.

AMI: Alternate Mark Inversion defines a pulse as a “mark”, a

binary one, as opposed to a zero. In a T1 (DS1) network con-
nection, signals are transmitted as a sequence of ones and
zeros. Ones are sent as pulses, and zeros are sent as
spaces, i.e., no pulse.  Every other pulse is inverted from the
previous pulse in polarity, so that the signal can be effectively
transmitted. This means, however, that a long sequence of
zeros in the data stream will cause problems, since the
CSU/DSU receiving the signal relies on the signal to recover
the 1.544 Mb/s clock. To get around this problem, one method
is to limit the data rate per channel (known as a DS0,
because it is a 64 kb/s portion of the DS1 frame or super-
frame) to 56 kb/s and forcing a pulse in the last data bit to
ensure a minimum pulse density in the signal. If you must use
AMI with a DS0 data rate of 64 kb/s, you should ensure that
the data terminal equipment connected to the unit provides a
minimally acceptable pulse density. For this reason, there are
advantages to using B8ZS instead.

b

a

2710A

Summary of Contents for 2710A Series

Page 1: ...MODEL 2710A Series T1 Fractional T1 to V 35 Converter T1 Fractional T1 CSU DSU SALES OFFICE 301 975 1000 TECHNICAL SUPPORT 301 975 1007 http www patton com Part 07M 2710A UM Doc 08614U2 001 Rev B Revi...

Page 2: ...Support at 301 975 1007 1 1 WARRANTY STATEMENT Patton Electronics warrants all Model 2710A Series components to be free from defects and will at our option repair or replace the product should it fail...

Page 3: ...pecifications found in Part 68 of the FCC rules and regulations A label on the equipment bears the FCC registration number You may be requested to provide this information to your telephone company Th...

Page 4: ...over Clocking Also Operates as a High Speed Point to Point Modem Compact Size Plugs Directly into a Router Switch or other DTE Made in USA 2 2 GENERAL PRODUCT DESCRIPTION The Model 2710A Series are si...

Page 5: ...Network interface parameters Configuration may be accomplished using pc board mounted DIP Switches or via software using the RS 232 control port 3 1 DIP SWITCH CONFIGURATION The Model 2710A has sixte...

Page 6: ...e Coding Off SW2 3 Line Framing Off SW2 2 DS0 Rate Clock On SW2 1 Clock Mode Off Contiguous Starting From Channel 1 ESF ANSI T1 403 64 kbps Network B8ZS 0dB Function SW2 2 SW2 1 Clock Mode Don t Care...

Page 7: ...dentical to AMI except that under certain circum stances the alternate polarity rule is deliberately violated AMI This stands for Alternate Mark Inversion The CSU DSU transmits data as a sequence of o...

Page 8: ...ts are now used for framing CRC and the Facility Data Link FDL The FDL allows maintenance messages and information to be passed between the 2710A and the Central Office Switch SW2 2 DS0 Channel Rate T...

Page 9: ...results Your terminal program s setup screen may differ from this one 4 When the unit is first turned on the terminal screen may appear blank Press the Enter key If your serial connection is good then...

Page 10: ...s options allow you to monitor the network performance initiate V 54 loops local loops and send test patterns Network performance parameters are updated once a second giving you the ability to quickly...

Page 11: ...F UNFRAMED This is a special mode that allows you to achieve the maximum possible data rate of 1 544 Mb s million bits per second by using the framing bits for data transmission There is no signaling...

Page 12: ...er DS0 channel to 56 kb s Your carrier will advise you on whether to use 64 or 56 kb s This is not available when using the Unframed format Clocking Network default Options Network Internal External N...

Page 13: ...to regain control should one be locked out after a loop back is initiated Remote In band Loops Enabled default Options Enabled Disabled In ESF D4 and Unframed formats the unit can respond to special r...

Page 14: ...56kbps the Bandwidth Selected will be a multiple of 56k not of 64k When using the DIP switches to set the band width the starting channel is always channel 1 3 2 3 System Diagnostics The System Diagno...

Page 15: ...he local unit then sends an all ones pattern before returning to the Idle state TxP The Model 2710A is sending a test pattern while in Test Mode IdlP The Model 2710A is sending a test pattern in place...

Page 16: ...s that the remote unit or the central office is sending a Blue Alarm because it is not receiving a sig nal the alarm is an unframed all ones signal mainly used to keep the line alive and to indicate t...

Page 17: ...looks like this factory default Header Line 1 Header Line 2 Headers 1 and 2 are provided for easy identification of your unit after installation You may want to give each unit a unique name via the h...

Page 18: ...interfaces This section briefly describes connection to each 4 1 DTE INTERFACE CONNECTION The DTE interface is a V 35 DCE presented as an M 34 male con nector This interface is designed to plug direct...

Page 19: ...niversal input 100 240VAC power supply The universal input power supply is equipped with a male IEC 320 power entry con nector Either power supply connects to the Model 2710A by means of a barrel jack...

Page 20: ...on Sending V 54 Loopback Pattern LED stays on PWR Power glows green to indicate that the unit is receiving power 5 2 LOOP V 54 TELCO DIAGNOSTICS The Model 2710A offers three V 54 loop diagnostics and...

Page 21: ...to clear all central office loops 5 3 BIT ERROR RATE V 52 DIAGNOSTICS The Model 2710A offers three V 52 Bit Error Rate BER test pat terns These test patterns may be invoked along with the LAL and RDL...

Page 22: ...ATTON ELECTRONICS MODEL 2710A CABLE RECOMMENDATIONS The Patton Electronics 2710A Series has been performance tested by Patton Electronics technicians using twisted pair cable with the fol lowing chara...

Page 23: ...GNMENT RJ 48C T1 DS0 Network Interface Female Modular Jack Pin Signal 1 RX Data TIP 1 2 RX Data RING1 4 TX Data TIP 5 TX Data RING TRS Jack RS 232 Control Port Pin Signal Source Tx Data From Model 271...

Page 24: ...Clock DTE Source KK Aux Power Input 5VDC 300mA APPENDIX E PATTON ELECTRONICS MODEL 2710A POWER SUPPLY INTERFACE Via Main 5VDC power jack J1 Center Pin 5VDC 300 mA Outer Barrel Ground Jumper Position f...

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