Cronyx E1xl User manual

1.0E / 01.05.2001

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Features

• Two E1 links (PCM-30)

• Distance up to 1.5 km

• Two synchronous interfaces: V.35,

RS-530, RS-449, RS-232, X.21,

Ethernet, or IDSL-modem

• Asynchronous mode for RS-232

interface

• Programmable timeslot assignment

• G.704 frame alignment

• CAS and CRC4 multiframe align-

ment

• G.703 2,048 kbps unframed mode

• Cronyx PCM2 modem compatibility

• Data rates from 64 to 2,048 kbps

• Timing from the digital interface of

receive and transmit path (DTE

emulation)

• «Three-to-one» multiplexer mode

• «Drop-Insert» multiplexer mode

• Digital, local, and remote

loopbacks

• Integrated BER tester

• RS-232 port for monitoring and

control purposes

• Alarm interface («dry contacts»)

• Stand-alone or rack-mount (19"

3U) design

• AC or DC built-in power supply unit

• Upgradeable firmware

• The Certificate No. ÎÑ/1-ÑÏÄ-19

of Electrosvyaz Sertification Sys-

tem issued by the Russian Ministry

of Communications

Flexible multiplexer

E1XL

Rev. D

E1XL Multiplexer

User Manual

FLEXIBLE MULTIPLEXER E1-XL

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Contents

Features .............................................................................. 1

Specifications ................................................................................................ 4

Description ......................................................................... 5

Package contents .......................................................................................... 6

Operation modes................................................................ 6

Two independent devices mode .................................................................. 6

Ordering code ................................................................................................ 6

Multiplexer mode ........................................................................................... 7

«Three-to-one» multiplexer mode ..................................................................................................... 7

«Drop-Insert» multiplexer mode ....................................................................................................... 8

Controls and indicators ..................................................... 9

Front panel controls...................................................................................... 9

Front panel indicators................................................................................... 9

Jumpers ......................................................................................................... 9

Line impedance .................................................................................................................................. 9

Programming mode ......................................................................................................................... 10

DIP switches ................................................................................................ 10

Console ........................................................................................................ 10

Configuration parameters ................................................11

Saving settings ................................................................................................................................. 11

Selection of operation mode ............................................................................................................ 11

Selection of data insert link ............................................................................................................. 11

Selection of data drop link............................................................................................................... 11

Transmit path synchronization ....................................................................................................... 11

E1 link mode .................................................................................................................................... 11

Timeslot 16 assignment ................................................................................................................... 13

CRC4 multiframe alignment ........................................................................................................... 13

Location of the monitoring channel in E1 frame .......................................................................... 13

Initial timeslot .................................................................................................................................. 13

Number of timeslots ......................................................................................................................... 13

Data rate in the unframed mode ..................................................................................................... 13

Digital port asynchronous mode ..................................................................................................... 15

Loss of sync action ........................................................................................................................... 15

Receive path synchronization .......................................................................................................... 15

Clock inversion ................................................................................................................................ 15

CTS generation logic .................................................................................. 16

Automatic loopback activation on a remote request ...................................................................... 16

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Scrambler ......................................................................................................................................... 16

Receive path sensitivity .................................................................................................................... 16

Synchronization modes....................................................16

Single timing source ................................................................................... 16

Separate timing sources............................................................................. 17

Synchronization in multiplexer mode........................................................ 18

DTE emulation ............................................................................................. 18

DTE1 emulation mode..................................................................................................................... 18

DTE2 emulation mode..................................................................................................................... 19

Timing source specifications ..................................................................... 20

X.21 interface ............................................................................................... 20

Loopbacks .........................................................................20

Normal operation......................................................................................... 20

Local loopback ............................................................................................ 21

Remote loopback ........................................................................................ 21

Digital loopback........................................................................................... 21

Alarm interface ..................................................................22

Back panel connectors .....................................................22

Management using a console ..........................................24

Ethernet interface ..............................................................30

Upgrade of on-board firmware.........................................31

Synchronous data transmission .....................................32

Considerations on building synchronous links .............................................................................. 33

Connector pin assignments .............................................37

V.35 cable for connecting to DCE with external transmit clocks ............ 37

V.35 cable for connecting to DCE with external transmit clocks, for a

multi-standard interface .......................................................................... 37

V.35 cable for connecting to DCE with external receive and transmit

clocks ....................................................................................................... 37

V.35 cable for connecting to DCE with external receive and transmit

clocks, for a multi-standard interface .................................................... 38

V.35 cable for a multi-standard interface .................................................. 38

RS-232 cable for a multi-standard interface ............................................. 38

RS-530 cable for a multi-standard interface ............................................. 38

RS-449 cable for a multi-standard interface ............................................. 39

Cable for connecting two devices with a multi-standard interface ........ 39

X.21 cable for a multi-standard interface .................................................. 39

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Specifications

Digital interface

Data rate............................................................ 64 to 1,984 kbps (Nx64) or to

2,048 kbps in the unframed mode

Timing signals .................................................. TXC, RXC, ETC, ERC

Modem signals.................................................. DTR, DSR, CTS, RTS, CD

E1 interface

Line coding ....................................................... HDB3

Line impedance ................................................ 120 Ohm balanced (twisted pair) or

75 Ohm unbalanced (coaxial),

set with jumpers

Signal level at receiver input ............................ 0 to –36 dB (max. 1.5 km distance via

0.6 mm twisted pairs)

Transmit path synchronization ......................... from the internal clock generator, or

from E1/0 link receive path, or

from E1/1 link receive path, or

from digital port 0, or

from digital port 1

Phase jitter attenuation ..................................... In receive or transmit paths,

attenuation up to 120UIpp

Frame structure ................................................. According to G.704

Multiframes ...................................................... CRC4, CAS (G.704)

Frequencies offset adjustment .......................... controlled slip buffers

in receive paths

Connector ......................................................... removable terminal block

Alarm interface

Relay contacts current ...................................... max. 250 mA

Relay contacts voltage ...................................... max. 175V DC

Connector ......................................................... Mini DIN, 6 pins

Control port

Interface type .................................................... RS-232

Data transfer protocol ....................................... asynchronous, 9600 kbps, 8N1

Connector ......................................................... DB9 female

Diagnostics modes

Loopbacks......................................................... digital (via digital interface), or

local (via G.703 line at a local device), or

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Description

Cronyx-E1/XL is a multipurpose device intended

for connection to E1/PCM30 links.

Serving as an interface and rate converter the

device receives data from a digital interface (64

to 2,048 kbps) and allocates it in E1 flow thereby

using the necessary number of timeslots, or the

whole 2,048 kbps bandwidth in the unframed

mode.

Serving as a modem the device allows to build

high-speed data links based on twisted pair or

coaxial cables of up to 1.5 km in length.

Serving as a multiplexer the device enables to

split E1 flow into several (maximum 30) data

flows wherein DTE units using these separated

data flows can be located at a distance of up to

1.5 km. Drop-Insert mode provides connection

layouts of network equipment that considerably

increase the efficiency of E1/PCM30 links.

Stand-alone version of the multiplexer can be at

customer’s option equipped with RS-530, RS-

232, V.35, or X.21 interfaces ended with standard

connectors as well as with built-in Ethernet or

IDSL-modem units. There is also a multiplexer

version with a multi-standard interface ended

with HDB44 connector in which case the

interface type is determined by the adapter cable.

The multi-standard interface supports RS-232,

RS-530, RS-449, RS-422, V.35, and X.21

standards.

Two Cronyx E1XL devices with Ethernet

interface or a combination of Cronyx E1XL and

Cronyx E1L devices with Ethernet interface form

a Remote Bridge for interconnecting two LANs.

In the unframed mode you can use a Cronyx

E1XL device together with a Cronyx PCM2

modem.

The rack-mount version of the multiplexer

represents two physical units one of which is

inserted at the front side of the rack while another

one is inserted at its back side. This version of

the multiplexer is equipped with multi-standard

interfaces only.

Setting of the multiplexer configuration is

executed either using DIP switches, or via a

control port with RS-232 interface. In case of

power failure all configuration parameters are

stored in a non-volatile memory.

If there is nobody at the far end to enable E1 link

loopback it can be activated remotely from the

local node. The in-band management of the

remote device is executed over an additional

monitoring channel which uses a special timeslot

0 bit (in compliance with G.704 requirements)

or any bit of some other timeslot at user’s option.

This monitoring channel is not available in the

unframed mode.

In addition to rack-mount and stand-alone

versions of E1/XL multiplexer there are also

versions available representing cards for IBM

compatible PCs (Cronyx-Tau/E1 and Cronyx-

Tau-PCI/E1 multiplexers).

On-board firmware of desktop multiplexers can

be updated via a console port. New firmware

versions enable to expand multiplexer

capabilities. Downloading of special firmware

versions allows to fully change multiplexer

functionality. The updates are available at

Cronyx web site www.cronyx.ru.

This User Manual describes the stand-alone

version of the device.

Cronyx E1XL rack-mount multiplexers have some

functional differences. Please follow

corresponding instructions supplied with

multiplexers of that type to operate them.

remote (via G.703 line at a remote device)

activated using front panel switches

or via control port

Bit error rate tester ............................................ activated using front panel switches

or via control port

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Package contents

The delivery package includes the following:

• E1/XL multiplexer in the ordered configuration

• Removable terminal blocks for connection to

E1 lines — 2 ea.

• Power cord (for AC power models)

• User Manual

Operation modes

Two independent devices mode

Two data links are fully independent in this mode. Data entering the digital port input is assigned to

selected timeslots of a corresponding E1 link. Unused timeslots are filled with ones.

Data from selected timeslots of a corresponding E1 link arrives at the digital port output. Unused

timeslots are ignored.

In this mode the framing of data in E1 flow can be disabled so as data can be transmitted unframed. In

this case data occupies all the 2,048 kbps bandwidth but its rate at the digital port may be limited.

E1-XL in two independent devices mode

Control port

To RS-232 terminal

E1 link 0

(max. 1.5 km)

Е1

interface 0

Digital interface 0

RS-530, RS-232,

V.35, X.21,

Ethernet, IDSL

E1 link 0

(max. 1.5 km)

Е1

interface 1

Digital interface 1

RS-530, RS-232,

V.35, X.21,

Ethernet, IDSL

Power supply:

(for stand-alone version)

AC - ~220V

DC - =60V

E1-XL/R-ETH/V35-AC

Model

Design:

B - stand-alone

R - 19'' rack-mount

Digital interface of link 1:

*530 - RS-530

*232 - RS-232

*V35 - V.35

*X21 - X.21

*ETH - Ethernet

*DSL- IDSL modem

M - multi-standard

* - For stand-alone version only

Digital interface of link 0:

*530 - RS-530

*232 - RS-232

*V35 - V.35

*ETH - Ethernet

*X21 - X.21

*DSL- IDSL modem

M - multi-standard

Ordering code

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Multiplexer mode

In multiplexer mode timeslots that are not used for digital port data transmission are translated

undistorted between E1 links.

E1XL flexible multiplexer allows to allocate every digital port data in different E1 links, separate for

both directions of data transmission. That is you can assign separate E1 links of data drop and insert

for every digital port.

The most common configurations include:

- «Three-to-one» multiplexer

- «Drop-Insert» multiplexer

«Three-to-one» multiplexer

In this configuration both digital links transmit and receive data via E1/0 link but use different timeslots.

Unused timeslots are translated into E1/1 link. Two devices connected by E1 link enable the transmission

of data between digital ports. There should be no cross-connection between timeslots assigned to each

digital port.

Below is an example of E1XL device application in «three-to-one» multiplexer mode. The

following figure depicts the concurrent interconnection of routers, LANs, and PBXs via the same

link.

Two E1-XL multiplexers in “three-to-one” multiplexer mode

To RS-232

terminal

E1 link

(max. 1.5 km)

E1 sublink

(max. 1.5 km)

RS-530, RS-

232, V.35,

X.21,

Ethernet,

IDSL

Control port To RS-232

terminal

Digital

interface

E1 sublink

(max. 1.5 km)

interface

Digital

interface

RS-530, RS-

232, V.35,

X.21,

Ethernet,

IDSL

RS-530, RS-

232, V.35,

X.21,

Ethernet,

IDSL

interface

Control port

Digital

interface

Digital

interface

RS-530, RS-

232, V.35,

X.21,

Ethernet,

IDSL

interface

An example of E1XL application in “three-to-one” multiplexer mode

Router

E1XL E1 Network

Router

PBX PBX

sublink

E1XL

10BaseT 10BaseT Serial

Port

Serial

Port

Ethernet Hub Ethernet Hub

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An example of E1XL application in "Drop-Insert" multiplexer mode

E1XL

PBX PBX

E1 link

E1XL

10BaseT10BaseT

Ethernet Hub Ethernet Hub

Ethernet Hub

10BaseT 10BaseT

Timeslots used in LAN data transmission

Timeslots used in communications

between PBXs

E1 link E1 link

E1 link

Front panel controls

E1-XL in “Drop-Insert” multiplexer mode

Control port

To RS-232

terminal

E1 link

(max. 1.5 km)

Digital

interface

E1 link

(max. 1.5 km)

Digital

interface

RS-530, RS-

232, V.35,

X.21,

Ethernet,

IDSL

RS-530,

RS-232,

V.35, X.21,

Ethernet,

IDSL

interface 1

interface 0

«Drop-Insert» multiplexer

In this mode a separate E1 link for independent data drop and insert can be assigned to each digital

port.

The following is an example of E1XL device application in «Drop-Insert» mode. The figure below

depicts three geographically distributed LANs interconnected using some timeslots of E1 link

passing through LAN sites. Timeslots that are not engaged in transmission of data between LANs

are used to connect two PBXs.

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Controls and indicators

Front panel controls

BERT – three-position switch activating bit error

rate tester:

BERT Bit error rate tester

L0 On, E1/0 line testing

OFF Off, normal operation

L1 On, E1/1 line testing

LOOP – two three-position switches (LOOP1 and

LOOP2) allowing to select a loopback type and

a link number.

LOOP1 Loopback

LOC E1 local loopback

DIG Digital interface loopback

REM E1 remote loopback

LOOP2 Point of loopback activation

L0 Link 0

0 Loopback disabled

L1 Link 1

The following table contains information on

positions of LOOP1 and LOOP2 switches

enabling certain loopbacks.

Loopback LOOP1 LOOP2

Disabled Any OFF

E1/0 local loopback LOC L0

E1/1 local loopback LOC L1

E1/0 remote loopback REM L0

E1/1 remote loopback REM L1

Interface 0 digital loopback DIG L0

Interface 1 digital loopback DIG L1

Front panel indicators

IndicatorFunction

PWR AC power present

RTS digital interface signals

RERR remote device errors

LERR local device errors

TST testing modes

Ethernet port RTS indicator shows that the port

has a fault-free cable connected.

TST indicator shows the selected testing mode:

Off Normal operation

On Bit error rate tester is enabled

Blink Local loopback is enabled

Single Remote loopback is enabled

flashes

Double Digital loopback is enabled

flashes

In normal operation mode LERR indicator lights

up in the absence of an input signal in E1 line, or

when there is a loss of frame or multiframe

alignment recorded. When the BER tester is

enabled LERR indicator is on in the presence of

errors in the line.

RERR indicator is on at the loss of

synchronization at a remote device (bit A of

timeslot 0).

Jumpers

Positions of jumpers inside the multiplexer case

are shown on the figure below.

To change the positions you should unfasten

mounting screws fixing the top cover of the

device and then remove the cover.

Warning!!! Before removing the cover always

make sure that the device is disconnected from

the 220V mains.

Line impedance

The default factory configuration of the

multiplexer is intended for use with twisted pairs

(120 Ohm). E1 line impedance is set by jumpers

numbering three for each link. You should remove

the jumpers for twisted pairs and replace them

for coaxial cables (75 Ohm).

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E1/0 link impedance

jumpers E1/1 link impedance

jumpers

Programming mode

enabling jumpers

NORM

PROG

Programming mode

To download a new version of the on-board

firmware you should reposition two internal

jumpers from NORM to PROG. Upon

completion of the programming procedure

return the jumpers to NORM position.

DIP switches

The stand-alone version has the DIP switches

located on the bottom cover of the device.

S1 group — link 0 timeslots.

S2 group — link 1 timeslots.

S3 group — modem configuration and timing

modes.

The following designations are used to show

positions of the microswitches:

OFF position

ON position

Console

The front panel of the multiplexer is equipped

with a DB9 connector intended for connection

of a control terminal (a console) with RS-232

9600 kbps interface. The console can be used to

monitor current operation modes of the device

as well as link status and statistics on both local

and remote errors. If the remote control is enabled

(using S3-9 microswitch) a user can set device

modes from the console and save them in a non-

volatile memory.

Link 0 timeslots

Configuration and

synchronization

Bottom cover view

S1 S3 S2

Link 1 timeslots

E1-XL

console

Control

terminal

Cable without modem control

GND

TXD

RXD

RTS

CTS

DTR

GND

TXD

RXD

RTS

CTS

DTR

DSR

DB9

male E1-XL

console

Control

terminal

Cable with modem control

GND

TXD

RXD

RTS

CTS

DTR

GND

TXD

RXD

RTS

CTS

DTR

DSR

DB9

male

The console connector has standard pin layout.

It is recommended to use cables with the

following connector pin assignments:

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Configuration parameters

At every turning on of the multiplexer it is being

configured according to the defined parameters.

There are two sources of setting configuration

parameters:

- DIP switches on the bottom cover of the device

- NVRAM storing parameters set from a console

Saving settings

S3-9 microswitch enables the remote control of

the multiplexer, i. e. configuring its parameters

from a terminal connected to the console port. In

the remote control mode configuration

parameters of the device are stored in its non-

volatile memory (NVRAM). When the remote

control is disabled NVRAM is not used and all

parameters can be set using DIP switches only.

S3-9 Setting parameters

Only DIP switches are used; remote

control is disabled; NVRAM is not

used

A remote terminal is used; parameters

are stored in NVRAM; DIP switches

are not used

Selection of operation mode

S3-10 microswitch position determines E1XL

link configuration:

S3-10 — Configuration

two independent links

multiplexer

Selection of data insert link

In multiplexer mode S3-6 and S3-8

microswitches determine E1 links for digital ports

0 and 1 respectively where to transmit data.

S3-6 — insert link for port 0 (Insert0)

S3-8 — insert link for port 1 (Insert1)

E1/0

E1/1

Selection of data drop link

In multiplexer mode S3-5 and S3-7

microswitches determine E1 links for digital ports

0 and 1 respectively where to drop data from.

S3-5 — data drop link for port 0 (Drop0)

S3-7 — data drop link for port 1

(Drop1)

E1/0

E1/1

Transmit path synchronization

S3-1, S3-2 and S3-3, S3-4 pairs of microswitches

allow to select a transmit path synchronization

mode for E1/0 and E1/1 links respectively:

S3-1:S3-2 — E1/0 link synchronization

S3-3:S3-4 — E1/1 link synchronization

INT — internal clock generator

From Link X — from the receiver

From Link X — from the other link

receiver

From Port X — from the digital

interface

When a console is used to set configuration

parameters you can also set the transmit path

synchronization from the other link digital

interface.

E1 link mode

In Dual mode E1 links can be configured to work

either with or without frame alignment support

(G.704). The parameter can be changed from the

console only. When DIP switches are used to set

configuration parameters the frame alignment

support mode (G.704) is always enabled.

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Parameter Values when configuring Values when configuring

using DIP switches using a console

General parameters

Multiplexer mode Dual, MUX, Drop-Insert Dual, MUX, Drop-

Insert

E1 link parameters

E1 link mode Framed*Framed, Unframed

Transmit path INT, Link 0, Link 1, Port 0,Port1 INT, Link 0, Link1, Port 0, Port 1

timing source

Initial timeslot 1 - 31 1 - 31

Number of 1 - 31 1 - 31

timeslots (in series) (in random order)

CRC4 multiframe Disabled*Enabled, Disabled

alignment

Timeslot 16 Data transmission*Data transmission,

assignment CAS multiframe alignment

Location of TS0, bit Sa4*Any bit of any

monitoring channel timeslot at your choice

in E1 frame

Loss of sync Remote Alarm*Remote Alarm,

action AIS

Sensitivity -36 dB*-36 dB, -12 dB

Digital port parameters

Selection of data insert E1/0; E1/1 E1/0; E1/1

link

Selection of data drop E1/0; E1/1 E1/0; E1/1

link

Receive path RxC*RxC, ERC

synchronization mode

HDLC buffer Off* Off, On

CTS generation CTS=1*CTS=1, CTS=CD, CTS=RTS,

mode CTS=CD*RTS

RXC/ERC clock Normal*Normal, Inverted

pulses

TxC clock pulses Normal*Normal, Inverted

Unframed mode parameters

Automatic not available Allowed,

loopback activation Not allowed

on a remote request

Scrambler not available Disabled, Enabled

Data rate 64, 128, 256,

(kbps) 512, 1024, 2048

ALARM «dry» contacts parameters

Operation from From closing*From closing,

input pins of a From opening

remote device

* - The parameter can be changed from a console only.

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Timeslot 16 assignment

E1/0 and E1/1 link timeslot 16 assignment mode

can be changed from a console only. Timeslot 16

can be used for generation of standard CAS clock

signals and signal bits (abcd=1111, xyxx=1011)

in which case the timeslot cannot be used for data

transmission. In multiplexer mode you should

enable the data transmission via timeslot 16 in

both E1/0 and E1/1 links to ensure a transparent

translation of timeslot 16 from E1/0 into E1/1.

When DIP switches are used to set configuration

parameters timeslot 16 is used for data

transmission.

CRC4 multiframe alignment

When a console is used to set configuration

parameters of the multiplexer you can enable a

check of multiframe alignment on CRC4.

When DIP switches are used to set configuration

parameters the check of multiframe alignment on

CRC4 is disabled.

Location of the monitoring channel in

E1 frame

The control of a remote device and statistics

interchange are executed over a monitoring

channel which uses a single bit of E1 frame.

When a console is used to set configuration

parameters you can arbitrarily select a bit of any

timeslot for the monitoring channel.

When DIP switches are used to set configuration

parameters the monitoring channel uses Sa4 bit

of timeslot 0 in compliance with ITU-T G.704

recommendations.

Initial timeslot

S1-1...S1-5 and S2-1...S2-5 microswitches

determine the number of the initial timeslot for

data links 0 and 1 respectively.

In independent links mode link 0 settings refer

to E1/0 link and link 1 settings refer to E1/1 link.

In «three-to-one» multiplexer mode settings for

both links refer to E1/0 link and determine

timeslots to be transmitted to digital interfaces

0 and 1.

In «three-to-one» multiplexer mode timeslot

sets should not overlap. Nonselected timeslots

are translated into E1/1 link.

In «Drop-Insert» multiplexer mode timeslot

selection settings refer to the corresponding

port. Selection of timeslots to be used in E1/0

and E1/1 links depends on the direction of data

transmission set using S3-5…S3-8

microswitches.

In the unframed mode the above settings are of

no account.

Number of timeslots

S1-6...S1-10 and S2-6...S2-10 microswitches

determine the number of timeslots to be used for

data transmission of links 0 and 1 respectively.

In multiplexer mode all other timeslots are

translated unchanged between E1/0 and E1/1

links. Data rate depends on the number of selected

timeslots (Nx64 kbps).

Data rate in the unframed mode

When a console is used to set configuration

parameters there are six options of the data rate

in the unframed mode: 64, 128, 256, 512, 1024,

or 2048 kbps. Note that the line bandwidth

remains the same (2,048 kbps). You just decrease

the rate at the digital port only.

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S1-1...S1-5 — E1/0 initial timeslot

S2-1...S2-5 — E1/1 initial timeslot

not used

timeslot 1

timeslot 2

timeslot 3

timeslot 4

timeslot 5

timeslot 6

timeslot 7

timeslot 8

timeslot 9

timeslot 10

timeslot 11

timeslot 12

timeslot 13

timeslot 14

timeslot 15

timeslot 16

timeslot 17

timeslot 18

timeslot 19

timeslot 20

timeslot 21

timeslot 22

timeslot 23

timeslot 24

timeslot 25

timeslot 26

timeslot 27

timeslot 28

timeslot 29

timeslot 30

timeslot 31

S1-6...S1-10 — number — link 0 rate

S2-6...S2-10 — number — link 1 rate

0 timeslots — 0 kbps

1 timeslot — 64 kbps

2 timeslots — 128 kbps

3 timeslots — 192 kbps

4 timeslots — 256 kbps

5 timeslots — 320 kbps

6 timeslots — 384 kbps

7 timeslots — 448 kbps

8 timeslots — 512 kbps

9 timeslots — 576 kbps

10 timeslots — 640 kbps

11 timeslots — 704 kbps

12 timeslots — 768 kbps

13 timeslots — 832 kbps

14 timeslots — 896 kbps

15 timeslots — 960 kbps

16 timeslots —1024 kbps

17 timeslots — 1088 kbps

18 timeslots — 1152 kbps

19 timeslots — 1216 kbps

20 timeslots — 1280 kbps

21 timeslots — 1344 kbps

22 timeslots — 1408 kbps

23 timeslots — 1472 kbps

24 timeslots — 1536 kbps

25 timeslots — 1600 kbps

26 timeslots — 1664 kbps

27 timeslots — 1728 kbps

28 timeslots — 1792 kbps

29 timeslots — 1856 kbps

30 timeslots — 1920 kbps

31 timeslots — 1984 kbps

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Digital port asynchronous mode

RS-232 digital port supports both synchronous, and asynchronous data transmission modes. The

following data rates are available: 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, or 115200

bps. The port provides a support of 8N1, 7P1, 8P1 asynchronous code format.

Loss of sync action

When a console is used to set configuration parameters you can choose one of the following two types

of responses to a loss of E1 link synchronization:

Loss of sync action: Remote Alarm -

Establishes bit A of timeslot 0 in transmitted E1 frame.

Loss of sync action: AIS -

AIS is transmitted («blue code»).

When DIP switches are used to define configuration settings the parameter is always set to Remote

Alarm.

Receive path synchronization

Receive path synchronization can be realized using either signals received from the line (RXC), or an

external source (ERC). The synchronization from an external source is used when connecting to DCE

devices which do not support an external synchronization from a digital port (RS-232, V.35, RS-530).

In this case the modem issues data using clocks received at ERC input. The phase equalization of data

at the output of RXD digital port for ERC clocks is executed using FIFO buffer. To ensure the correct

buffer operation (with no overruns/underruns) the frequency of clocks received from the line should

equal to the frequency at ERC input. This condition is met when the data link has a single timing

source. Otherwise, recurrent errors will occur due to overruns or underruns of FIFO buffer. The rate of

such errors depends on the difference between the two frequencies.

ERC mode can be enabled from a console only. When DIP switches are used to set configuration

parameters of the modem ERC mode is disabled.

Clock inversion

In INT, From Link 0 and From Link 1 synchronization modes TXD data is delayed in relation to TXC

clocks. The total delay is formed of delays occurring in the cable and in the digital interface of the

equipment connected to the modem. As a result errors can occur at some data rates.

The problem can be solved in the following ways:

• Invert TXC by changing settings of the equipment connected to the modem

• Change the cable length

• Reverse TXC-a and TXC-b pins in one of the interface cable connectors

• When a console is used to set configuration parameters apply TxC clocks inversion

The similar problem can also occur when external clocks of ERC receive path are used. The problem

can be solved in the same ways as above:

• Change the cable length

• Reverse ERC-a and ERC-b pins in one of the interface cable connectors

• When a console is used to set configuration parameters apply ERC clock inversion

Clock inversion parameters can be set from a console only. When DIP switches are used to set

configuration parameters clocks always remain non-inverted.

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CTS generation logic

When a console is used to set configuration parameters you can select one of the following four rules

of CTS output signal generation:

CTS=1, CTS=CD, CTS=RTS, or CTS=CD*RTS.

When DIP switches are used to set configuration parameters CTS=1 rule is always applied.

Automatic loopback activation on a remote request

The parameter applies to the unframed mode only.

In complex configurations with a daisy chain of multiple devices this parameter can be used to choose

a network section to be tested using a remote loopback. The parameter can be changed from a console

only. When DIP switches are used to set configuration parameters the loopback activation on a remote

request is always enabled.

Scrambler

The parameter applies to the unframed mode only.

The scrambler is used to eliminate long sequences of zeroes and ones in G.703 output signal. The

scrambler can be enabled only if a console is used to set configuration parameters. When DIP switches

are used to set configuration parameters it is always disabled.

Receive path sensitivity

Receive path sensitivity determines the maximum length of E1 line. When a console is used to set

configuration parameters of the multiplexer you can choose one of the following two sensitivity values:

-12dB or -36dB.

When DIP switches are used to define configuration settings the reception path sensitivity is always

set to -36dB.

Synchronization modes

Single timing source

In independent links mode a single timing source for E1 path is usually used. The timing source can

represent either an internal clock generator of an E1 multiplexer, or an external signal of a DTE

device. The following figures depict examples of internal and external timing sources.

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Separate timing sources

Receive and transmit lines of E1 path are fully independent and can have separate timing sources.

Below is an example of such a mode.

MUX А

TXC

RXC

DTE A DTE B

CLK

MUX В

RXC

TXC

From Link

INT

Single timing from multiplexer A

MUX А

TXC

RXC

ETC

DTE A DTE B

CLK

MUX В

TXC

RXC

From Port From Link

Single timing from DTE A

MUX А

TXC

RXC

ETC

DTE A DTE B

MUX В

TXC

RXC

CLK

From Port INT

Separate timing from DTE A and multiplexer B

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Synchronization in multiplexer mode

In multiplexer mode you should use receive paths of E1 links as timing sources for transmit paths of

the opposite E1 links. Otherwise there will occur recurrent overruns/underruns of controlled slip buffers

at retranslating timeslots between E1 links due to different clock frequencies that in turn will cause a

retransmission (loss) of data frames.

DTE emulation

There are two clock pulse inputs (ERC and ETC) provided for connection of E1XL multiplexer to

DCE via RS-232, V.35, or RS-530 digital interface in a synchronous mode. X.21 interface has ETC

input only provided for.

DTE1 emulation mode

DTE1 emulation mode is used when connecting to DCE devices with a digital port (RS-232, V.35,

RS-530, X.21) as an external timing source. In this case a pair of devices interconnected via a digital

port (RS-232, V.35, RS-530, X.21) transparently translates the clock frequency.

MUX ВMUX А

TXC

RXC

ETC

CLK

DTE A

ETC

CLK

RXC

TXC

DTE B

From Port

Separate timing from DTE А and DTE В

From Port

MUX А

TXC

RXC

ETC

DTE A DTE B

CLK

MUX В

CLK

TXC

RXC

INT INT

Separate timing from multiplexers А and B

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DTE2 emulation mode

DTE2 emulation mode is used when connecting to DCE devices which do not support an external

synchronization from a digital port (RS-232, V.35, RS-530). In this case E1XL multiplexer receives

data at the digital port using clocks received at ETC input and transmits data using clocks received at

ERC input. The phase equalization of data at the output of RXD digital port for ERC clocks is executed

using FIFO buffer. To ensure the correct buffer operation (with no overruns/underruns) the frequency

of clocks received from the line should equal to the frequency at ERC input. This condition is met

when the data link has a single timing source. Otherwise, recurrent errors will occur due to overruns or

underruns of FIFO buffer. The rate of such errors depends on the difference between the two frequencies.

If the data transmitted in the link is in HDLC format you can compensate the frequencies offset enabling

HDLC buffer mode.

MUX А

DCE DTE

MUX В

TXD

TXC

TXD

RXD

TXD RXD

RXC ETC

RXD

ETC RXC

From Port

DTE1 emulation mode with external transmit clocks

MUX А

DCE DTE

MUX В

TXD

TXC

TXD

RXD

TXD RXD

RXC ETC

RXD

ETC, ERC

ERC RX C

FIFO

DTE2 emulation mode with external transmit and

receive clocks

HDLC mode

ENABLE/DISABLE

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Timing source specifications

Clock pulses can be sourced from either the

internal clock generator of E1XL multiplexer, or

an external synchronization input of the digital

port. The source of clock pulses used to generate

an output E1 signal determines parameters such

as phase jitter and the accuracy of the frequency.

Circuit technologies used in E1XL multiplexer

ensure the phase jitter and accuracy of output

frequency to meet the corresponding

requirements of ITU-T in those modes where the

multiplexer is selected as a timing source. If the

timing source represents any other device

connected to E1XL digital port (DTE1 and DTE2

emulation modes) always make sure that clock

signal parameters comply with ITU-T standards.

X.21 interface

Electric specifications of X.21 interface signals

meet the corresponding requirements of ITU-T

V.11. The interface has a different set of signals

as compared with all other interfaces:

X.21 RS-232

DB-15

2 Transmit (A)

9 Transmit (B)

4 Receive (A)

11 Receive (B)

7 ETC (A)

14 ETC (B)

6 Sig Timing (A)

13 Sig Timing (B)

3 Control (A)

10 Control (B)

5 Indication (A)

12 Indication (B)

1 Shield

8GND

X.21 interface uses the single clock signal for

received and transmitted data. To ensure the

correct data reception you should strictly follow

the requirement of using a single timing source.

Two interconnected devices should have settings

that allow to use the same clock generator as a

timing source for both devices.

Indication signal corresponds to CD signal

whereas Control signal corresponds to RTS

signal.

Loopbacks

Normal operation

LOOP2 switch is in «0» position.

MUX А

RXD

RTS

DTE A DTE B

MUX В

RTS

DSR

TXD

DSR

CTS

TXD

RXD

CTS

Carrier OK

"ON"

Carrier OK

"ON"

Normal

operation Normal

operation

cts=f(cd,rts) cts=f(cd,rts)

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