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Cyclades PC300 PCI Card for MikroTik RouterOS
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General Information


The MikroTik RouterOS supports the following Cyclades PC300 Adapter hardware:

  • RSV/V.35 (RSV models) with 1 or 2 RS-232/V.35 interfaces on standard DB25/M.34 connector, 5Mbps, internal or external clock
  • T1/E1 (TE models) with 1 or 2 T1/E1/G.703 interfaces on standard RJ48C connector, Full/Fractional, internal or external clock
  • X.21 (X21 models) with 1 or 2 X.21 on standard DB-15 connector, 8Mbps, internal or external clock


Packages required: synchronous
License required: Level4
Submenu level: /interface cyclades
Standards and Technologies: X.21, X.35, T1/E1/G.703, Frame Relay, PPP, Cisco-HDLC
Hardware usage: Not significant

Synchronous Interface Configuration

Submenu level: /interface cyclades


You can install up to four Cyclades PC300 PCI Adapters in one PC box, if you have so many adapter slots and IRQs available.

The Cyclades PC300/RSV Synchronous PCI Adapter comes with a V.35 cable. This cable should work for all standard modems, which have V.35 connections. For synchronous modems, which have a DB-25 connection, you should use a standard DB-25 cable.

Connect a communication device, e.g., a baseband modem, to the V.35 port and turn it on. The MikroTik driver for the Cyclades Synchronous PCI Adapter allows you to unplug the V.35 cable from one modem and plug it into another modem with a different clock speed, and you do not need to restart the interface or router.

Property Description

chdlc-keepalive (time; default: 10s) - Cisco-HDLC keepalive interval in secondsclock-rate (integer; default: 64000) - internal clock rate in bpsclock-source (internal | external | tx-internal; default: external) - source clockframe-relay-dce (yes | no; default: no) - specifies whether the device operates in Data Communication Equipment mode. The value yes is suitable only for T1 modelsframe-relay-lmi-type (ansi | ccitt; default: ansi) - Frame Relay Line Management Interface Protocol typeframing mode (CRC4 | D4 | ESF | Non-CRC4 | Unframed; default: ESF) - for T1/E1 channels only. The frame mode:

CRC4 - Cyclic Redundancy Check 4-bit (E1 Signaling, Europe)
D4 - Fourth Generation Channel Bank (48 Voice Channels on 2 T-1s or 1 T-1c)
ESF - Extended Superframe Format
Non-CRC4 - plain Cyclic Redundancy Check
Unframed - do not check frame integrity

line-build-out (0dB | 7.5dB | 15dB | 22.5dB; default: 0) - for T1 channels only. Line Build Out Signal Level.line-code (AMI | B8ZS | HDB3 | NRZ; default: B8ZS) - for T1/E1 channels only. Line modulation method:

AMI - Alternate Mark Inversion
B8ZS - Binary 8-Zero Substitution
HDB3 - High Density Bipolar 3 Code (ITU-T)
NRZ - Non-Return-To-Zero

line-protocol (cisco-hdlc | frame-relay | sync-ppp; default: sync-ppp) - line protocolmedia-type (E1 | T1 | V24 | V35 | X21; default: V35) - the hardware media used for this interfacemtu (integer; default: 1500) - Maximum Transmission Unit for the interfacename (name; default: cycladesN) - descriptive interface namerx-sensitivity (long-haul | short-haul; default: short-haul) - for T1/E1 channels only. Numbers of active channels (up to 32 for E1 and up to 24 for T1)



  • The cyclades interface does not show up under the interfaces list

    Obtain the required license for synchronous feature

  • The synchronous link does not work

    Check the V.35 cabling and the line between the modems. Read the modem manual

RSV/V.35 Synchronous Link Applications


Let us consider the following network setup with MikroTik Router connected to a leased line with baseband modems and a CISCO router at the other end:


The driver for the Cyclades PC300/RSV Synchronous PCI Adapter should load automatically. The interface should be enabled according to the instructions given above. The IP addresses assigned to the cyclades interface should be as follows:

[admin@MikroTik] ip address> add address= interface=cyclades1
[admin@MikroTik] ip address> print
Flags: X - disabled, I - invalid, D - dynamic
  #   ADDRESS            NETWORK         BROADCAST       INTERFACE
  0      ether1
  1         cyclades1
  2   ether2
[admin@MikroTik] ip address> /ping 64 byte ping: ttl=255 time=12 ms 64 byte ping: ttl=255 time=8 ms 64 byte ping: ttl=255 time=7 ms
3 packets transmitted, 3 packets received, 0% packet loss
round-trip min/avg/max = 7/9.0/12 ms
[admin@MikroTik] ip address> /tool flood-ping size=1500 count=50
        sent: 50
    received: 50
     min-rtt: 1
     avg-rtt: 1
     max-rtt: 9

[admin@MikroTik] ip address>

Note that for the point-to-point link the network mask is set to 32 bits, the argument network is set to the IP address of the other end, and the broadcast address is set to The default route should be set to gateway router

[admin@MikroTik] ip route> add gateway= interface=cyclades1
[admin@MikroTik] ip route> print
Flags: X - disabled, A - active, D - dynamic, 
C - connect, S - static, r - rip, b - bgp, o - ospf, m - mme, 
B - blackhole, U - unreachable, P - prohibit 
 #      DST-ADDRESS        PREF-SRC        G GATEWAY         DISTANCE INTER...
 0 A S                          r         1        cyclades1
 1 ADC      r                 0        ether1
 2 ADC   r                 0        ether2
 3 ADC         r                 0        cyclades1
[admin@MikroTik] ip route>

The configuration of the CISCO router at the other end (part of the configuration) is:

CISCO#show running-config
Building configuration...

Current configuration:
interface Ethernet0
 description connected to EthernetLAN
 ip address
interface Serial0
 description connected to MikroTik
 ip address
 serial restart-delay 1
ip classless
ip route


Send ping packets to the MikroTik router: 


Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to, timeout is 2 seconds:
Success rate is 100 percent (5/5), round-trip min/avg/max = 28/32/40 ms
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