Cross-Connect DWDM Platform Volga

The first Russian OTN cross-connector Volga performs digital switching ODU streams in ODU0/1/2/3/4 levels in non-blocking mode. XC2T model have total capacity up to 2 Tbit/s. A cross-switch with a 4 Tbit/s matrix capacity is being developed.

OTN switching (OTN X-Connect) allows you to freely redistribute OTN traffic between different ports of the same device at the level of individual ODU-k containers on different linear ports with different wavelengths. Thus, the OTN switch allows the operator to manage the distribution of client port traffic on transport channels more efficiently. Moreover, each client port is no longer strictly connected to a specific transport channel (as in the muxponder): traffic can be switched to any transport interface through the control system, or you can configure automatic traffic redistribution depending on the load of channels.

OTN technology is the successor to SDH channel switching technology, a key element of which is cross-connection of VC-x channels. OTN cross-connect ODU-k channels took the best and useful SDH functions, such as:

1. The Add-Drop & Continue function allows you to copy the same service channel, for example, in two independent directions (linear outputs) and at different wavelengths.
2. The function of the protective switching SNCP ODU-k of the working channel to the standby ≤ 50 ms.

OTN technology is used in conjunction with DWDM spectral multiplexing technology, where several OTN ODU-k channels of different levels at different wavelengths can be transmitted simultaneously on a single fiber. A combination of OTN and DWDM technologies is today the most common solution for building modern fiber-optic telecommunication networks.

Parameters / ChassisXC9R2V10R2-X2V10R2-X4*
Chassis switching capacity900 G2 T4 T
Number of cards11+2 (out of cross connect for transponders)13
X-connect cards23
Line cards100 G1x200G, 2х100G, 2x200G
Types of client cards10х10 G (10GE, STM-64, OTU2, 10GFC, 100GE)2x100G, 20X10G (10GE, STM-64, OTU2), 10GFC, 100GE, 40G, STM-256
Redundancy X-connect cards1+12+1
Redundant control units1+1
Sync block reservations1+1
Power supply redundancy1+1

Equipment for the Volga series chassis with OTN switching

  • Transfer up to 2 channels 100 / 200G from one line card
  • Replaceable CFP / CFP2 modules on line cards
  • A wide variety of client interfaces and the number of ports (up to 20) on client boards
  • Plug-in SFP + / SFP28 modules on client boards

The WDM / OTN cross-switch architecture implies the presence in the chassis of separate line cards (DWDM side) and tributary cards (client interface side), interconnected via the OTN cross-connect matrix. For example, in the new XC900 chassis, it will be possible to use 2 slots for conventional transponders.

Line Card Features

Line Cards

Operating Mode





Number of interfaces





Interface type




Modulation format



Frequency grid

 50/100 GHz

Automatic dispersion correction

up to ± 20 ns/nm

до ± 50 ns/nm

до ± 40 ns/nm

Wavelength range

1528,7-1567,1 nm

OSNRτ (0,1 nm, BER=10-¹²

18,1 dB
19,2 dB

12,5 dB

11,4 dB


SD-FEC 15%

Output power (BER=10-¹²)

-15…+1 dBm

-5...0 dBm

-15…+1 dBm

Receiver sensitivity

-22 dBm

-18 dBm

-22 dBm

Receiver overload

0 dBm

Lightning protection

1,6 Mrad/s

1,6 Mrad/s

50 Krad/s

5 Mrad/s

Power consumption

150 W

130 W

110 W

130 W

Client Card Features

Client Cards

Operating Mode





Quantity and interface type

10 (SFP+)

20 (SFP+ /SFP28)

2 x ( QSFP+/

2 x ( QSFP+/QSFP28) + 1 x SFP+/

Interface standard


10GE, OTU2,
STM-64, 8/10GFC,
CPRI 4.9G/6.1G/9.8G,
16/32GFC, 25GE


10GE, OTU2, STM-64,
CPRI 4.9G/6.1G/9.8G,
8/10/16/32GFC, 25GE OTU3/

Power consumption

100 W

150 W

110 W

130 W