(1) Product Name:

The English name is FR (Frame Relay) leased line and the Chinese name is帧中继.

(2) Product Definition:

With bandwidth dynamic allocation enabled by statistical multiplexing and other technologies, FR product, carried on FR network, provides outburst data transmission service for users.

(1) Product Features:

FR leased line can provide point-to-point, point-to-multi-point data, image and voice transmission. The leased line can also be used as data link for Internet and other networks. At the same time, domestic long-distance private line circuits, Hong Kong, Macau, Taiwan and international private line circuits are available for subscription according to customer needs.

(2) Product advantages:

1. The virtual circuit technology is applicable to outburst service.   

2. Improved transmission efficiency and shortened latency for not using save-transmit technology.

3. Every FR line and network port can be shared by multiple terminal users in terms of information flow (i.e. PVC).

4. Suitable for LAN interconnection.

(1) Basic attributes:

The product mainly provides multiple-speed (below 2Mb/s) circuit transmission.

(2) Service categories and speeds:
1. port speed:

( 1 ) Physical access:   N*64K    ( N =1,2,….32 )             

( 2 ) DDN access:   N*64K ( N =1,2,….32 )

( 3 ) optical access:   2M

( 4 ) ATM port access:   155M

2.  PVC speeds:

( 1 ) local circuits, Hong Kong, Macau, Taiwan and international circuits: 8K--2M

( 2 ) domestic circuits: 64K--2M

(3) Terminal devices:

Access terminals include Paradyne 7975, Paradyne 7985 and COLT-2. Most frequently used device is Paradyne 7975 which supports N*64K with 5 KM effective distance. At present, Paradyne 7975 is used in all expanded telecom offices and newly built access points.

4. Network solution

(1)  FR port: physical line from customer premise to FR node. 

(1) Physical access: twisted pair network access through baseband Modem, MODEM interface is V.35.

(2) SDH or optical access: network access through baseband HDSL or optical transceiver, equipment interface is G.703.

(3) DDN access: FR network access through DDN network connection, MODEM interface is V.35.

(4) ATM port: use ATM network to build high-bandwidth port, optical interface is provided.   

(2)  PVC (permanent virtual circuit) :

The link connection between two ports is called permanent virtual circuit. DLCI (Data Link Connection Identifier) is used to identify the connection of UNI and NNI.

(1) Point to point: A PVC is set up between two FR ports for point-to-point communication.

(see Figure 2-1)

(2) Point to multi-point: PVCs are set up between FR head point and all FR branch points for point-to-multi-point communication. (see Figure 2-2)

(3) Point to Internet: A PVC is set up between FR port at customer premise and Internet for Internet services. (see Figure 2-3)

Figure 2-3

Notes: port refers to the point where the central office installs, tests and adjusts the circuits at customer premises. Below is the calculation method:

1. Port charge is based on the number of ports installed (use different resources to build ports, one-off charges are collected according to the product used).

2. PVC charge calculation

         (1) Point to point: New installation applicant needs to pay for both ends; one-point relocation applicant needs to pay for one end and two-point relocation applicant needs to pay for both ends; speed upgrade applicant needs to pay for both ends. 

(2) Point to multi-point: New installation applicant needs to pay for both ends; one-point relocation applicant needs to pay for one end and two-point relocation applicant needs to pay for both ends; speed upgrade applicant needs to pay for both ends. 

(3) Point to Internet: only one end is charged when new installation, relocation or speed upgrade is applied for.

Port Monthly Rental Table (Unit: yuan)

PVC Monthly Rental Table (Unit: yuan)